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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2017	Mar. 02, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	CECE
Entity Registrant Name	CECO ENVIRONMENTAL CORP
Entity Central Index Key	0000003197
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		34,736,834
Entity Public Float			$ 277.5

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 29,902	$ 45,824
Restricted cash	591	1,498
Accounts receivable, net	67,990	83,062
Costs and estimated earnings in excess of billings on uncompleted contracts	33,947	38,123
Inventories, net	20,969	21,487
Prepaid expenses and other current assets	10,760	13,560
Prepaid income taxes	1,930	1,590
Assets held for sale	7,853	7,834
Total current assets	173,942	212,978
Property, plant and equipment, net	23,400	27,270
Goodwill	166,951	170,153
Intangible assets – finite life, net	49,956	60,728
Intangible assets – indefinite life	19,691	22,042
Deferred charges and other assets	4,609	5,463
Total assets	438,549	498,634
Current liabilities:
Current portion of debt	11,296	8,827
Accounts payable and accrued expenses	70,786	95,610
Billings in excess of costs and estimated earnings on uncompleted contracts	20,469	35,085
Note payable	5,300	5,300
Income taxes payable		1,536
Total current liabilities	107,851	146,358
Other liabilities	30,382	34,864
Debt, less current portion	103,537	114,366
Deferred income tax liability, net	10,210	12,964
Total liabilities	251,980	308,552
Commitments and contingencies
Shareholders’ equity:
Preferred stock, $.01 par value; 10,000 shares authorized, none issued
Common stock, $.01 par value; 100,000,000 shares authorized, 34,707,924 and 34,300,209 shares issued and outstanding at December 31, 2017 and 2016, respectively	347	343
Capital in excess of par value	248,170	244,878
Accumulated loss	(52,673)	(41,741)
Accumulated other comprehensive loss	(8,919)	(13,042)
Stockholders' equity before treasury stock	186,925	190,438
Less treasury stock, at cost, 137,920 shares at December 31, 2017 and 2016	(356)	(356)
Total shareholders’ equity	186,569	190,082
Total liabilities and shareholders' equity	$ 438,549	$ 498,634

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	34,707,924	34,300,209
Common Stock, shares outstanding	34,707,924	34,300,209
Treasury stock, shares	137,920	137,920

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 345,051	$ 417,011	$ 367,422
Cost of sales	231,857	282,152	258,251
Gross profit	113,194	134,859	109,171
Selling and administrative expenses	88,975	81,743	67,329
Acquisition and integration expenses		524	7,940
Amortization and earnout expenses	7,132	20,231	25,613
Intangible asset and goodwill impairment	7,168	57,923	3,340
Restructuring expenses	1,895
Income (loss) from operations	8,024	(25,562)	4,949
Other income (expense), net	106	310	(2,081)
Interest expense	(6,721)	(7,712)	(5,964)
Income (loss) before income taxes	1,409	(32,964)	(3,096)
Income tax expense	4,438	5,290	2,638
Net loss	(3,029)	(38,254)	(5,734)
Net loss attributable to noncontrolling interest		(36)	(132)
Net loss attributable to CECO Environmental Corp.	$ (3,029)	$ (38,218)	$ (5,602)
Loss per share:
Basic	$ (0.09)	$ (1.12)	$ (0.19)
Diluted	$ (0.09)	$ (1.12)	$ (0.19)
Weighted average number of common shares outstanding:
Basic	34,445,256	33,979,549	28,791,662
Diluted	34,445,256	33,979,549	28,791,662

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (3,029)	$ (38,254)	$ (5,734)
Other comprehensive income (loss), net of tax:
Translation income (loss)	4,021	(3,864)	(2,664)
Interest rate swap	180	312
Minimum pension/postretirement liability adjustment	(78)	87	(292)
Comprehensive income (loss)	1,094	(41,719)	(8,690)
Net loss attributable to noncontrolling interest		(36)	(132)
Comprehensive income (loss) attributable to CECO Environmental Corp.	$ 1,094	$ (41,683)	$ (8,558)

Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	CECO	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2014	$ 181,224	$ 264	$ 168,886	$ 19,051	$ (6,621)	$ (356)	$ 181,224
Beginning Balance, Shares at Dec. 31, 2014		26,405,000				(138,000)
Net loss	(5,734)			(5,602)			(5,602)	$ (132)
Common stock dividends	(7,977)			(7,977)			(7,977)
Exercise of stock options and dividend reinvestment issuances	$ 205		205				205
Exercise of stock options and dividend reinvestment issuances, Shares	30,000	36,000
Excess tax benefit from stock options exercised	$ 44		44				44
Share based compensation earned	2,070		2,070				2,070
Share based compensation earned, Shares		13,000
Stock issued for acquisition	72,145	$ 76	72,069				72,145
Stock issued for acquisitions, Shares		7,602,000
Stock repurchase and retirement, Shares		0
Fair value of noncontrolling interest acquired	6,000							6,000
Adjustment for minimum pension/post retirement liability, net of tax	(292)				(292)		(292)
Translation income (loss)	(2,664)				(2,664)		(2,664)
Ending Balance at Dec. 31, 2015	245,021	$ 340	243,274	5,472	(9,577)	$ (356)	239,153	5,868
Ending Balance, Shares at Dec. 31, 2015		34,056,000				(138,000)
Translation (loss) gain, beginning balance at Dec. 31, 2014	(1,743)
Translation (loss) gain, ending balance at Dec. 31, 2015	(4,407)
Minimum pension/post retirement liability adjustment beginning balance at Dec. 31, 2014	(4,878)
Minimum pension/post retirement liability adjustment, ending balance at Dec. 31, 2015	(5,170)
Accumulated other comprehensive loss, beginning balance at Dec. 31, 2014	(6,621)
Accumulated other comprehensive loss, activity	(2,956)
Accumulated other comprehensive loss, ending balance at Dec. 31, 2015	(9,577)
Net loss	(38,254)			(38,218)			(38,218)	(36)
Common stock dividends	(8,995)			(8,995)			(8,995)
Exercise of stock options and dividend reinvestment issuances	$ 1,515	$ 2	1,513				1,515
Exercise of stock options and dividend reinvestment issuances, Shares	195,000	215,000
Excess tax benefit from stock options exercised	$ 137		137				137
Restricted stock units issued	(9)		(9)				(9)
Restricted stock units issued, Shares		17,000
Share based compensation earned	2,458	$ 1	2,457				2,458
Share based compensation earned, Shares		27,000
Issuance of shares for cashless warrant exercise		$ 1	(1)
Issuance of shares for cashless warrant exercise, Shares		90,000
Stock repurchase and retirement	(1,238)	$ (1)	(1,237)				(1,238)
Stock repurchase and retirement, Shares		(105,000)
Noncontrolling interest acquisitions	(7,088)		(1,256)				(1,256)	$ (5,832)
Adjustment for minimum pension/post retirement liability, net of tax	87				87		87
Interest rate swap	312				312		312
Translation income (loss)	(3,864)				(3,864)		(3,864)
Ending Balance at Dec. 31, 2016	190,082	$ 343	244,878	(41,741)	(13,042)	$ (356)	190,082
Ending Balance, Shares at Dec. 31, 2016		34,300,000				(138,000)
Translation (loss) gain, ending balance at Dec. 31, 2016	(8,271)
Minimum pension/post retirement liability adjustment, ending balance at Dec. 31, 2016	(5,083)
Accumulated other comprehensive loss, activity	(3,465)
Accumulated other comprehensive loss, ending balance at Dec. 31, 2016	(13,042)
Interest rate swap liability adjustment ending balance at Dec. 31, 2016	312
Net loss	(3,029)			(3,029)			(3,029)
Cumulative effect adjustment adopting ASU 2016-09 (See Note 1)	66		177	(111)			66
Common stock dividends	(7,792)			(7,792)			(7,792)
Exercise of stock options and dividend reinvestment issuances	$ 1,295	$ 3	1,292				1,295
Exercise of stock options and dividend reinvestment issuances, Shares	292,000	291,000
Restricted stock units issued	$ (135)	$ 1	(136)				(135)
Restricted stock units issued, Shares		92,000
Share based compensation earned	1,959		1,959				1,959
Share based compensation earned, Shares		25,000
Stock repurchase and retirement, Shares		0
Adjustment for minimum pension/post retirement liability, net of tax	(78)				(78)		(78)
Interest rate swap	180				180		180
Translation income (loss)	4,021				4,021		4,021
Ending Balance at Dec. 31, 2017	186,569	$ 347	$ 248,170	$ (52,673)	$ (8,919)	$ (356)	$ 186,569
Ending Balance, Shares at Dec. 31, 2017		34,708,000				(138,000)
Translation (loss) gain, ending balance at Dec. 31, 2017	(4,250)
Minimum pension/post retirement liability adjustment, ending balance at Dec. 31, 2017	(5,161)
Accumulated other comprehensive loss, activity	4,123
Accumulated other comprehensive loss, ending balance at Dec. 31, 2017	(8,919)
Interest rate swap liability adjustment ending balance at Dec. 31, 2017	$ 492

Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Stockholders Equity [Abstract]
Adjustment for minimum pension/post retirement liability, tax	$ (48)	$ 53	$ (178)
Adjustment for interest rate swap liability, tax	$ 103	$ 181

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (3,029)	$ (38,254)	$ (5,734)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,088	18,903	16,520
Unrealized foreign currency (gain) loss	(2,103)	777	2,364
Net (gain) loss on interest rate swaps	(327)	95
Impairment of property and equipment	695
Impairment of intangible assets and goodwill	7,168	57,923	3,340
Fair value adjustments to earnout liabilities	(6,610)	4,218	11,222
Earnout payments	(7,797)
Loss on sale of property and equipment	130	217	397
Amortization of debt discount	1,033	1,054	1,062
Share based compensation expense	1,768	2,280	2,070
Bad debt expense	3,895	848	702
Inventory reserve expense	240	1,167	680
Excess tax benefit from stock options exercised		(137)	(44)
Deferred income tax benefit	(3,123)	(3,750)	(3,488)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	14,107	13,294	(15,605)
Costs and estimated earnings in excess of billings on uncompleted contracts	6,232	2,537	4,447
Inventories	887	9,449	(3,477)
Prepaid expenses and other current assets	3,530	(2,218)	3,132
Deferred charges and other assets	1,585	(73)	(191)
Accounts payable and accrued expenses	(15,847)	(6,593)	(8,582)
Billings in excess of costs and estimated earnings on uncompleted contracts	(15,186)	7,440	4,324
Income taxes payable	(1,827)	143	1,166
Other liabilities	5,061	279	(1,668)
Net cash provided by operating activities	6,570	69,599	12,637
Cash flows from investing activities:
Acquisitions of property and equipment	(1,028)	(1,076)	(763)
Cash paid for acquisitions, net of cash acquired			(37,481)
Net proceeds from sale of assets	368	657	3,205
Net cash used in investing activities	(660)	(419)	(35,039)
Cash flows from financing activities:
Decrease in restricted cash	1,425	3,137	481
Net borrowings (repayments) on revolving credit lines	2,269	(13,407)	(10,727)
Borrowings of long-term debt			170,000
Repayments of long-term debt	(11,168)	(41,768)	(107,695)
Deferred financing fees paid	(692)		(2,923)
Payoff of loans on life insurance policies		(987)
Earnout payments	(7,396)	(9,270)	(2,488)
Proceeds from sale-leaseback transactions		14,244
Payments on capital leases and sale-leaseback financing liability	(711)	(426)
Proceeds from employee stock purchase plan, exercise of stock options, and dividend reinvestment plan	1,352	1,685	205
Cash paid for repurchase of common shares		(188)
Excess tax benefit from stock options exercised		137	44
Dividends paid to common shareholders	(7,792)	(8,995)	(7,977)
Net cash (used in) provided by financing activities	(22,713)	(55,838)	38,920
Effect of exchange rate changes on cash and cash equivalents	881	(1,712)	(486)
Net (decrease) increase in cash and cash equivalents	(15,922)	11,630	16,032
Cash and cash equivalents at beginning of year	45,824	34,194	18,162
Cash and cash equivalents at end of year	29,902	45,824	34,194
Non-cash transactions
Common stock issued in business acquisitions			72,145
Property, plant and equipment acquired under capital leases		4,385
Noncontrolling interest acquired through an issuance of a note payable (See Note 17)		5,300
Earnout settled through an exchange of accounts receivable		3,272
Accrual of share repurchase		1,050
Cash paid during the year for:
Interest	5,686	6,923	4,742
Income taxes	$ 3,048	$ 6,415	$ 5,080

Nature of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Nature of Business and Summary of Significant Accounting Policies

1.	Nature of Business and Summary of Significant Accounting Policies

Nature of business— CECO Environmental Corp. and its consolidated subsidiaries (“CECO,” the “Company,” “we,” “us,” or “our”) is a diversified global provider of leading highly engineered technologies to the environmental, energy, and fluid handling and filtration industrial segments, targeting specific niche-focused end markets through an attractive asset-light business model, strategically balanced across the world. CECO has over $5 billion of installed equipment base with end users, which we target to expand and grow a higher recurring revenue of aftermarket products and services. CECO’s well-respected brands, technologies and solutions have been evolving for well over 50 years to become leading-edge technologies in specific niche global end markets.

Principles of consolidation—Our consolidated financial statements include the accounts of the following subsidiaries:

	% Owned As Of December 31, 2017
CECO Group, Inc.		100	%
CECO Group Global Holdings LLC		100	%
CECO Filters, Inc. and Subsidiaries (“CFI”)		99	%
The Kirk & Blum Manufacturing Company		100	%
CECO Air Quality Solutions, Inc.		100	%
EFFOX, Inc. (“Effox”)		100	%
Fisher-Klosterman, Inc. (“FKI”)		100	%
Flextor, Inc. (“Flextor”)		100	%
Adwest Technologies, Inc. (“Adwest”)		100	%
Aarding Thermal Acoustics B.V. (“Aarding”)		100	%
Met-Pro Technologies LLC (“Met-Pro”)		100	%
Peerless Mfg. Co. (“PMFG”)		100	%

In fiscal 2017, a new subsidiary, CECO Air Quality Solutions, Inc., was formed and merged with former subsidiary CECO Abatement Systems, Inc. Additionally, New Busch Co., Inc. (“Busch”) merged with CFI. Further, Met-Pro wholly owned subsidiaries MPC Inc., Met-Pro Industrial Services and Bio-Reaction Industries merged with Met-Pro. The Company will continue to optimize its legal entity structure through consolidation and mergers of subsidiaries in the future.

CFI includes one wholly owned subsidiary, CECO Environmental India Private Limited (f/k/a. CECO Filter India Private Limited). The noncontrolling interest in CFI is not material.

FKI includes three wholly owned subsidiaries, AVC, Inc. (“AVC.”), Emtrol LLC (“Emtrol”) and SAT Technology, Inc. (“SAT”).

Met-Pro includes eight wholly owned subsidiaries, Mefiag B. V., Met-Pro Recovery/Pollution Control Technologies, Inc., Strobic Air Corporation, Mefiag (Guangzhou) Filter Systems Ltd., Met-Pro (Hong Kong) Company Limited, Met-Pro Holding LLC, Jiangyin Zhongli Industrial Technology Co., Ltd. (“Zhongli’) and Met-Pro Chile Limitada.

CECO Group, Inc. has two wholly owned subsidiaries in Mexico, CECO Environmental Mexico S de RL de CV and CECO Environmental Services Mexico S de RL de CV.

PMFG has five wholly owned subsidiaries, Nitram Energy, Inc., PMC Acquisition, Inc., Peerless Europe, Ltd., Peerless Manufacturing Canada, Ltd., and Peerless Asia-Pacific Pte. Ltd. Additionally, PMFG was the majority owner of Peerless Propulsys China Holdings LLC (“Peerless Propulsys”). The Company’s former 60% equity investment in Peerless Propulsys entitled it to 80% of the earnings. Peerless Propulsys was the sole owner of Peerless China Manufacturing Co. Ltd. (“PCMC”). On July 12, 2016, the Company entered into an agreement with the noncontrolling owner of Peerless Propulsys and acquired 100% ownership in the equity and earnings of Peerless Propulsys of their interest (40%). For a more complete discussion of the transaction, refer to Note 17.

PMFG is a global provider of engineered equipment for the abatement of air pollution, the separation and filtration of contaminants from gases and liquids, and industrial noise control equipment, and was acquired in September 2015.

Unless indicated, all balances within tables are in thousands except per share amounts. All intercompany balances and transactions have been eliminated.

Use of estimates—The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”), requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Cash equivalents—We consider all highly liquid investments with original maturities of three months or less to be cash equivalents. At December 31, 2017 and 2016, included in Restricted Cash is cash in support of letters of credit issued by various foreign subsidiaries of the Company. The Company occasionally enters into letters of credit with durations in excess of one year.

Accounts Receivable—Trade receivables are generally uncollateralized customer obligations due under normal trade terms requiring payment generally within 30 days from the invoice date unless otherwise determined by specific contract terms, generally due to retainage provisions. The Company’s estimate of the allowance for doubtful accounts for trade receivables is primarily determined based upon the length of time that the receivables are past due. In addition, management estimates are used to determine probable losses based upon an analysis of prior collection experience, specific account risks and economic conditions. The Company has a series of actions that occur based upon the aging of past due trade receivables, including letters, statements, direct customer contact and liens. Accounts are deemed uncollectible based on past account experience and the current financial condition of the account.

Inventories—As a result of prospectively adopting ASU 2015-11, in fiscal year 2017 the Company’s inventory is primarily valued at the lower of cost or net realizable value. In fiscal year 2016, the Company’s inventories are primarily valued at the lower of cost or market. The impact of the adoption was not material. The Company uses the first-in, first-out inventory costing method as well as the last-in, first-out method as of December 31, 2016 and 2017, respectively. As of December 31, 2017 and 2016, approximately 14% and 8%, respectively, of our inventory is valued on the last-in, first-out method. Inventory quantities are regularly reviewed and provisions for excess or obsolete inventory are recorded based on the Company’s forecast of future demand and market conditions. Significant unanticipated changes to the Company’s forecasts could require a change in the provision for excess or obsolete inventory.

Assets Held for Sale—The Company classifies properties as held for sale when certain criteria are met. At such time, the properties, including significant assets that are expected to be transferred as part of a sale transaction, are presented separately on the consolidated balance sheet at the lower of carrying value or estimated fair value less costs to sell and depreciation is no longer recognized. At December 31, 2017, the Company had three buildings, two tracts of land and equipment classified as held for sale. As of December 31, 2016, the Company had two buildings, two tracts of land and equipment classified as held for sale.

Property, plant and equipment—Property, plant and equipment are carried at the cost of acquisition or construction and depreciated over the estimated useful lives of the assets. Depreciation and amortization are provided using the straight-line method in amounts sufficient to amortize the cost of the assets over their estimated useful lives (buildings and improvements—generally five to 40 years; machinery and equipment—generally two to 15 years). Upon sale or disposal of property, plant and equipment, the applicable amounts of asset cost and accumulated depreciation are removed from the accounts, and the net amount, less any proceeds from sale, is recorded in income.

Intangible assets— Indefinite life intangible assets are comprised of tradenames, while finite life intangible assets are comprised of technology, customer lists, noncompetition agreements and tradenames. Finite life intangible assets are amortized on a straight line or accelerated basis over their estimated useful lives of seven to 10 years for technology, five to 20 years for customer lists, five years for noncompetition agreements and 10 years for tradenames.

Long-lived assets—Property, plant and equipment and finite life intangible assets are reviewed whenever events or changes in circumstances occur that indicate possible impairment. If events or changes in circumstances occur that indicate possible impairment, our impairment review is based on an undiscounted cash flow analysis at the lowest level at which cash flows of the long-lived assets are largely independent of other groups of our assets and liabilities. This analysis requires management judgment with respect to changes in technology, the continued success of product lines, and future volume, revenue and expense growth rates. We conduct annual reviews for idle and underutilized equipment, and review business plans for possible impairment. Impairment occurs when the carrying value of the assets exceeds the future undiscounted cash flows expected to be earned by the use of the asset or asset group. When impairment is indicated, the estimated future cash flows are then discounted to determine the estimated fair value of the asset or asset group and an impairment charge is recorded for the difference between the carrying value and the estimated fair value.

Additionally, the Company evaluates the remaining useful life each reporting period to determine whether events and circumstances warrant a revision to the remaining period of depreciation or amortization. If the estimate of a long lived asset’s remaining useful life is changed, the remaining carrying amount of the asset is amortized prospectively over that revised remaining useful life.

The Company completes an annual (or more often if circumstances require) impairment assessment of its indefinite life intangible assets. As a part of its annual assessment, typically, the Company first qualitatively assesses whether current events or changes in circumstances lead to a determination that it is more likely than not (defined as a likelihood of more than 50 percent) that the fair value of an asset is less than its carrying amount. If there is a qualitative determination that the fair value of a particular asset is more likely than not greater than its carrying value, we do not need to proceed to the traditional quantitative estimated fair value test for that asset. If this qualitative assessment indicates a more likely than not potential that the asset may be impaired, the estimated fair value is calculated by the relief from royalty method. If the estimated fair value of an asset is less than its carrying value, an impairment charge is recorded for the amount by which the carrying value of the asset exceeds its calculated implied fair value. For the 2017 annual assessment, given the lower than expected results for certain reporting units, we determined that a quantitative assessment of fair value for all indefinite life intangible assets using the relief from royalty method was appropriate. Refer to Note 7 for the results of this quantitative analysis.

Goodwill—The Company completes an annual (or more often if circumstances require) impairment assessment on October 1 of its goodwill on a reporting unit level, at or below the operating segment level. As a part of its annual assessment, the Company first qualitatively assesses whether current events or changes in circumstances lead to a determination that it is more likely than not (defined as a likelihood of more than 50 percent) that the fair value of a reporting unit is less than its carrying amount. If there is a qualitative determination that the fair value of a particular reporting unit is more likely than not greater than its carrying value, the Company does not need to quantitatively test for goodwill impairment for that reporting unit. If this qualitative assessment indicates a more likely than not potential that the asset may be impaired, the estimated fair value is calculated using a weighting of the income method and the market method. If the estimated fair value of a reporting unit is less than its carrying value, an impairment charge is recorded. In fiscal year 2017, the Company prospectively adopted ASU 2017-04, which eliminates Step 2 and recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value with the loss not exceeding the total amount of goodwill allocated to that reporting unit. In 2016, the Company recognized an impairment charge for the amount by which the carrying value of the goodwill exceeds its calculated implied fair value (formerly known as “Step 2”). For the 2017 annual assessment, given the lower than expected results for certain reporting units, we determined that a quantitative assessment of fair value for all reporting units with goodwill was appropriate. Refer to Note 7 for the results of this quantitative analysis.

Deferred charges—Deferred charges include deferred financing costs, which are amortized to interest expense over the life of the related loan. The Company incurred and capitalized $0.7 million of deferred financing fees in 2017 related to long-term debt modifications. The Company did not incur or capitalize deferred financing fees in 2016. During 2015, the Company capitalized deferred financing fees of $2.9 million related to the issuance of new debt. Amortization expense was $1.0 million, $1.1 million and $0.8 million for 2017, 2016 and 2015, respectively, and is classified as interest expense. Also, during 2015, an additional $0.3 million of existing fees were expensed, and classified as interest expense, as a result of the modification of the Credit Agreement (refer to Note 9 for further details of the modification). As of December 31, 2017 and 2016, remaining capitalized deferred financing costs of $2.8 million and $3.2 million, respectively, are included as a discount to debt in the accompanying Consolidated Balance Sheets.

Revenue recognition—Revenues from contracts are primarily recognized on the percentage of completion method, measured by the percentage of contract costs incurred to date compared with estimated total contract costs for each contract. This method is used because management considers contract costs to be the best available measure of progress on these contracts. For contracts where the duration is short, total contract revenue is insignificant, or reasonably dependable estimates cannot be made, revenues are recognized on a completed contract basis, when risk and title passes to the customer, which is generally upon shipment of product.

During 2016, the Company’s Zhongli division within the Energy segment has recognized revenue on a percentage of completion method compared with the completed contracts method that was utilized in 2015 (as the division did not meet the criteria to use percentage of completion). This change was made after determining that the Company had designed and implemented appropriate controls to track project costs and estimates to complete. During the year ended December 31, 2016, this division recognized $7.9 million in percentage of completion revenue related to open projects as of December 31, 2016.

The asset “Costs and estimated earnings in excess of billings on uncompleted contracts” represents revenues recognized in excess of amounts billed. The liability “Billings in excess of costs and estimated earnings on uncompleted contracts” represents billings in excess of revenues recognized. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Changes to job performance, job conditions, and estimated profitability may result in revisions to contract revenue and costs and are recognized in the period in which the revisions are made. No provision for estimated losses on uncompleted contracts was required at December 31, 2017, and 2016.

Cost of sales—Cost of sales amounts include materials, direct labor and associated benefits, inbound freight charges, purchasing and receiving, inspection, warehousing, and depreciation. Generally, customer freight charges are included in sales and actual freight expenses are included in cost of sales.

Claims—Change orders arise when the scope of the original project is modified for any of a variety of reasons. The Company will negotiate the extent of the modifications, its expected costs and recovery with the customer. Costs related to change orders are recognized in the period they are incurred and added to the expected total cost of the project. In cases where contract revenues are assured beyond a reasonable doubt to be increased in excess of the expected costs of the change order, incremental profit also is recognized on the contract. Such assurance is generally only achieved when the customer approves in writing the scope and pricing of the change order. Change orders that are in dispute are effectively handled as claims.

Claims are amounts in excess of the agreed contract price that the Company seeks to collect from customers or others for customer-caused delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price. Costs attributable to claims are treated as contract costs as incurred.

The Company recognizes certain significant claims for recovery of incurred costs when it is probable that the claim will result in additional contract revenue and when the amount of the claim can be reliably estimated. When the customer or other parties agree in writing to the amount of the claim to be recovered by the Company, the amount of the claim becomes contractual and is accounted for as an increase in the contract’s total estimated revenue and estimated cost. As actual costs are incurred and revenues are recognized under percentage-of-completion accounting, a corresponding percentage of the revised total estimated profit will therefore be recognized.

Should it become probable that the claim will not result in additional contract revenue, the Company removes the related contract revenues from its previous estimate of total revenues, which effectively reduces the estimated profit margin on the job and negatively impacts profit for the period.

Pre-contract costs—Pre-contract costs are not significant. The Company expenses all pre-contract costs as incurred regardless of whether or not the bids are successful. A majority of our business is obtained through a bidding process and this activity is on-going with multiple bids in process at any one time. These costs consist primarily of engineering, sales and project manager wages, fringes and general corporate overhead and it is deemed impractical to track activities related to any one specific contract.

Selling and administrative expenses—Selling and administrative expenses on the Consolidated Statements of Operations include sales and administrative wages and associated benefits, selling and office expenses, professional fees, bad debt expense, changes in life insurance cash surrender value and depreciation. Selling and administrative expenses are charged to expense as incurred.

Acquisition and integration expenses—Acquisition and integration expenses on the Consolidated Statements of Operations are related to acquisition activities, which include retention, legal, accounting, banking, and other expenses.

Amortization and earnout expenses—Amortization and earn out expenses on the Consolidated Statements of Operations include amortization of intangible assets, and changes to earnout and contingent compensation amounts related to acquisitions as more fully presented and described in Notes 7 and 8.

Restructuring expenses—Restructuring expense on the Consolidated Statements of Operations include expenses related to a restructuring program implemented during the fourth quarter of fiscal 2017 to reduce operating costs in the future. Within restructuring expenses are charges related to severance, facility exit, legal and property, plant and equipment impairment. The Company’s policy is to recognize restructuring expenses in accordance with the accounting rules related to exit or disposal activities.

Indirect Taxes—The Company records taxes collected from customers and remitted to governmental authorities on a net basis in the Consolidated Statements of Operations.

Product Warranties—The Company’s warranty reserve is to cover the products sold. The warranty accrual is based on historical claims information. The warranty reserve is reviewed and adjusted as necessary on a quarterly basis and is presented within Note 8.

Advertising costs—Advertising costs are charged to operations in the year incurred and totaled $0.9 million, $0.9 million and $1.0 million in 2017, 2016 and 2015, respectively.

Research and Development—Although not technically defined as research and development, a significant amount of time, effort and expense is devoted to (a) custom engineering which qualifies products for specific customer applications, (b) developing proprietary process technology and (c) partnering with customers to develop new products.

Income taxes— On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) was signed into law making significant changes to the U.S. tax code. Changes affecting the Company’s consolidated 2017 financial statements include, but are not limited to, a U.S federal corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017 and a one-time transition tax, payable over eight years, on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017. Several other provisions of the Tax Act take effect beginning with the Company’s 2018 consolidated financial statements.

On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Act when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. In accordance with SAB 118, the Company has recognized provisional amounts related to the tax effects of the Tax Act for which the company was able to make reasonable estimates. We have not completed our accounting for the income tax effect of all elements of the Tax Act. For the provisions of the Tax Act for which the Company was unable to determine a provisional amount, the Company has continued to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act.

Tax effects of the Tax Act will be recognized or adjusted as additional implementation guidance is released and analyses are finalized, but no later than the end of the measurement period prescribed by SAB 118, which is one year from the enactment date of the Tax Act.

Income taxes are determined using the asset and liability method of accounting for income taxes in accordance with FASB ASC Topic 740, “Income Taxes”. Under ASC Topic 740, tax expense includes U.S. and international income taxes. Until the December 22, 2017 enactment of the Tax Act, tax expense also included the provision for U.S. taxes on undistributed earnings of international subsidiaries not deemed to be indefinitely reinvested. The Company’s 2017 results include a one-time “transition tax” on the deemed repatriation of previously undistributed foreign earnings. For distributions of such earnings after December 31, 2017, no U.S. taxes will be imposed. However, certain foreign jurisdictions may still apply withholding taxes to such distributions; certain states may also impose income taxes on such distributions.

Tax credits and other incentives reduce tax expense in the year the credits are claimed. Deferred income taxes are provided using the asset and liability method whereby deferred tax assets are recognized for deductible temporary differences and operating loss and tax credit carry-forwards and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases, and are measured using enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be recovered or settled. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment. As of December 31, 2017, ending deferred tax assets and liabilities have been provisionally revalued to reflect the estimated effect of the change in the U.S. federal income tax rate from 35% to 21%.

In addition, from time to time, management must assess the need to accrue or disclose uncertain tax positions for proposed potential adjustments from various federal, state and foreign tax authorities who regularly audit the Company in the normal course of business. In making these assessments, management must often analyze complex tax laws of multiple jurisdictions, including many foreign jurisdictions. The accounting guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company records the related interest expense and penalties, if any, as tax expense in the tax provision.

Another change brought about by the Tax Act is a provision designed to currently tax global intangible low-taxed income (“GILTI”). Although the provision is one of the many that will take effect for the Company’s 2018 consolidated financial statements, an accounting policy election with respect to GILTI could have an impact on deferred tax balances as of December 31, 2017. The company may either elect to record the U.S. income tax effect of future GILTI inclusions in the period in which they arise or establish deferred taxes with respect to the expected future tax liabilities associated with future GILTI inclusions. The Company has not yet made a policy election and no provisional amounts for the GILTI provisions were recorded as of December 31, 2017.

Earnings per share—The computational components of basic and diluted earnings per share for 2017, 2016 and 2015 are below.

	For the Year Ended December 31, 2017
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(3,029	)		34,445	$	(0.09	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(3,029	)		34,445	$	(0.09	)

	For the Year Ended December 31, 2016
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(38,218	)		33,980	$	(1.12	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(38,218	)		33,980	$	(1.12	)

	For the Year Ended December 31, 2015
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(5,602	)		28,792	$	(0.19	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(5,602	)		28,792	$	(0.19	)

Options and warrants included in the computation of diluted earnings per share are so included on the treasury stock method. For the year ended December 31, 2017, 2016 and 2015, outstanding options and warrants and unvested restricted stock units of 0.7 million, 1.6 million and 1.5 million, respectively, were excluded from the computation of diluted earnings per share due to their having an anti-dilutive effect.

Once a restricted stock award vests, it is included in the computation of weighted average shares outstanding for purposes of basic and diluted earnings per share.

Foreign Currency Translation—The functional currencies of the Company’s subsidiaries in the Netherlands, United Kingdom, Brazil, Canada, China, Mexico, Chile, and India are the Euro, Pound, Real, Canadian Dollar, Renminbi, Peso, Chilean Peso, and Rupee, respectively, and their books and records are maintained in the local currency. Translation adjustments, which are based upon the exchange rate at the balance sheet date for assets and liabilities and weighted-average rate for the Consolidated Statements of Operations, are recorded in Accumulated Other Comprehensive Loss in Shareholders’ equity on the Consolidated Balance Sheets.

Transaction gain/(loss) of $0.1 million, $0.7 million and $(1.7) million were recognized by the Company in 2017, 2016 and 2015, respectively. The transaction gain/(loss) is recorded on the “Other income (expense), net” line of the Consolidated Statements of Operations.

New Financial Accounting Pronouncements

Accounting Standards Adopted in Fiscal 2017

In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-04, “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates Step 2 of the former goodwill impairment test along with amending other parts of the goodwill impairment test. Under this ASU, an entity should perform its annual or interim goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount, and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value with the loss not exceeding the total amount of goodwill allocated to that reporting unit. This ASU is effective for annual periods beginning after December 15, 2019, and interim periods therein with early adoption permitted for interim or annual goodwill impairment tests performed after January 1, 2017. The Company has adopted ASU 2017-04 effective as of January 1, 2017. The provisions of ASU 2017-04 did not have a material effect on the Company’s financial condition, results of operations, or cash flows.

In March 2016, the FASB issued ASU 2016-09, “Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting,” which changes the accounting for certain aspects of share-based payments to employees. The new guidance requires, among its other provisions, that excess tax benefits (which represent the excess of actual tax benefits received at the date of vesting or settlement over the benefits recognized over the vesting period or upon issuance of share-based payments) and tax deficiencies (which represent the amount by which actual tax benefits received at the date of vesting or settlement is lower than the benefits recognized over the vesting period or upon issuance of share-based payments) be recorded in the income statement as an increase or decrease in income taxes when the awards vest or are settled. This is in comparison to the prior requirement that these excess tax benefits be recognized in additional paid-in capital and these tax deficiencies be recognized either as an offset to accumulated excess tax benefits, if any, or in the income statement. The new guidance also requires excess tax benefits to be classified along with other income tax cash flows as an operating activity in the statement of cash flows rather than, as previously required, a financing activity. The new guidance allows companies to elect a change to an accounting policy to account for forfeitures as they occur. The new guidance is effective for the first quarter of our fiscal year ended December 31, 2017, with early adoption permitted.

We have adopted ASU 2016-09 effective January 1, 2017 on a prospective basis where permitted by the new standard. As a result of this adoption:

• We recognized discrete tax benefits of $0.4 million in the income tax expense line item of our Consolidated Statement of Operations for the year ended December 31, 2017 related to excess tax benefits upon vesting or settlement in that period.

• We elected to adopt the cash flow presentation of the excess tax benefits prospectively, commencing with our Condensed Consolidated Statement of Cash Flows for the year ended December 31, 2017, where these benefits are classified along with other income tax cash flows as an operating activity.

• We have elected to change our accounting policy to account for forfeitures as they occur. This change was applied on a modified retrospective basis with a cumulative effect adjustment to reduce retained earnings by $0.1 million as of January 1, 2017.

• We excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of our diluted earnings per share for the year ended December 31, 2017.

In March 2016, the FASB issued ASU 2016-05, “Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships.” ASU 2016-05 amends Topic 815 to clarify that novation of a derivative (replacing one of the parties to a derivative instrument with a new party) designated as the hedging instrument would not, in and of itself, be considered a termination of the derivative instrument or a change in critical terms requiring discontinuation of the designated hedging relationship. ASU 2016-05 is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has adopted ASU 2016-05 on a prospective basis. The provisions of ASU 2016-05 had no effect on the Company’s financial condition, results of operations, or cash flows.

In July 2015, the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory.” ASU 2015-11 requires inventory within the scope of the ASU (i.e., first-in, first-out (“FIFO”) or average cost) to be measured using the lower of cost and net realizable value. Inventory excluded from the scope of the ASU (i.e., last-in, first-out (“LIFO”) or the retail inventory method) will continue to be measured at the lower of cost or market. The ASU also amends some of the other guidance in Topic 330, “Inventory,” to more clearly articulate the requirements for the measurement and disclosure of inventory. ASU 2015-11 is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has adopted ASU 2015-11 on a prospective basis. The provisions of ASU 2015-11 did not have a material effect on the Company’s financial condition, results of operations, or cash flows.

Accounting Standards Yet to be Adopted

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 expands an entity’s ability to apply hedge accounting for nonfinancial and financial risk components and allow for a simplified approach for fair value hedging of interest rate risk. ASU 2017-12 eliminates the need to separately measure and report hedge ineffectiveness and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line as the hedged item. Additionally, ASU 2017-12 simplifies the hedge documentation and effectiveness assessment under the previous guidance. The guidance is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted. We plan to adopt the standard on January 1, 2019. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, “Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting.” ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as a modification. The new guidance will reduce diversity in practice and result in fewer changes to the terms of an award being accounted for as a modification. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if the award’s fair value, vesting conditions and classification as an equity or liability instrument are the same immediately before and after the change. ASU 2017-09 will be applied prospectively to awards modified on or after the adoption date. The guidance is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted. We plan to adopt the standard on January 1, 2018. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” Under existing GAAP, an entity is required to present all components of net periodic pension cost and net periodic postretirement benefit cost aggregated as a net amount in the income statement, and this net amount may be capitalized as part of an asset where appropriate. ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period, and requires the other components of net periodic pension cost and net periodic postretirement benefit cost to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. Additionally, only the service cost component is eligible for capitalization, when applicable. The amendments in ASU 2017-07 shall be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. ASU 2017-07 becomes effective for the Company on January 1, 2018. Early adoption is permitted. We plan to adopt this standard on January 1, 2018. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business.” ASU 2017-01 clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill, and consolidation. The adoption of ASU 2017-01 is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The amendments should be applied prospectively on or after the effective dates. We plan to adopt the standard on January 1, 2018. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash.” ASU 2016-18 will require a change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents to be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU 2016-18 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that year. The Company plans to adopt the provisions of this standard on January 1, 2018, and will begin presenting segregated cash and restricted cash activity on the consolidated statements of cash flows using a retrospective transition method for each period presented.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 provides guidance on how certain cash receipts and cash payments are presented and classified in the statement of cash flows. ASU 2016-15 is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. ASU 2016-15 will require adoption on a retrospective basis, unless it is impracticable to apply, in which case we would be required to apply the amendments prospectively as of the earliest date practicable. Early adoption is permitted, including adoption in an interim period. We plan to adopt this standard on January 1, 2018. The Company is currently in the process of evaluating the impact of ASU 2016-15 on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases.” ASU 2016-02 establishes a right-of-use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. For public companies, this guidance is effective for annual periods beginning after December 15, 2018. We currently expect to adopt ASU 2016-02 as of January 1, 2019, under the modified prospective method. Our evaluation of ASU 2016-02 is ongoing and not complete. The Company believes that the new standard will have a material impact on its consolidated balance sheet due to the recognition of ROU assets and liabilities for the Company’s operating leases but it will not have a material impact on its income statement or liquidity. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. Our leasing activity is primarily related to buildings and we have various sale-leaseback transactions. The Company is continuing to evaluate potential impacts to our financial statements.

In May 2014, the FASB issued ASU 2014-09, “Revenue From Contracts With Customers.” ASU 2014-09 supersedes nearly all existing revenue recognition principles under GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration an entity expects to be entitled to for those goods or services using a defined five-step process. More judgment and estimates may be required to achieve this principle than under existing GAAP. In 2016, the FASB issued accounting standards updates to address implementation issues and to clarify the guidance for identifying performance obligations, licenses and determining if a company is the principal or agent in a revenue arrangement. ASU 2014-09 and its clarifying amendments are effective for annual periods beginning after December 15, 2017, including interim periods therein, using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients or (ii) a modified retrospective approach with the cumulative effect upon initial adoption recognized at the date of adoption, which includes additional footnote disclosures.

We adopted ASU 2014-09 on January 1, 2018, under the modified retrospective method where the cumulative effect is recognized through retained earnings as of the date of adoption. Historically, we have recognized revenue related to contracts predominantly under the percentage of completion method of accounting for revenue recognition. Given our diverse customer base and product lines, there are varying fact patterns that must be evaluated within each of our contracts to determine the appropriate pattern of revenue recognition upon the adoption of ASU 2014-09. Certain contract arrangements that were historically recognized over time under our previous policies will now be recognized at a point in time upon completion of the contracts under the new standard. However, based on the Company’s evaluation of existing contracts that were not substantially complete as of January 1, 2018, the Company has estimated that the cumulative adjustment to beginning retained earnings will not be material. Additionally, the Company’s future disclosures will be expanded to comply with the standard.

Financial Instruments

12 Months Ended

Dec. 31, 2017

Investments All Other Investments [Abstract]

Financial Instruments

2.	Financial Instruments

Our financial instruments consist primarily of investments in cash and cash equivalents, receivables and certain other assets, foreign debt, and accounts payable, which approximate fair value at December 31, 2017 and 2016, due to their short-term nature or variable, market-driven interest rates.

The fair value of the debt issued under the Credit Agreement was $114.9 million and $125.1 million at December 31, 2017 and 2016, respectively. The fair value of the note payable was $5.3 million at December 31, 2017 and 2016.

In accordance with the terms of the Credit Agreement, the Company entered into an interest rate swap on December 30, 2015 to hedge against interest rate exposure related to a portion of the outstanding debt indexed to LIBOR market rates. See Note 9 for further information regarding the interest rate swap.

At December 31, 2017 and 2016, the Company had cash and cash equivalents of $29.9 million and $45.8 million, respectively, of which $19.7 million and $25.6 million, respectively, was held outside of the United States, principally in the Netherlands, United Kingdom, China, and Canada.

Concentrations of credit risk:

Financial instruments that potentially subject us to credit risk consist principally of cash and accounts receivable. We maintain cash and cash equivalents with various major financial institutions. We perform periodic evaluations of the financial institutions in which our cash is invested. Concentrations of credit risk with respect to trade and contract receivables are limited due to the large number of customers and various geographic areas. Additionally, we perform ongoing credit evaluations of our customers’ financial condition.

Accounts Receivable

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Accounts Receivable

3.	Accounts Receivable

(Table only in thousands)	2017			2016
Trade receivables	$	11,603		$	11,976
Contract receivables		60,543			72,835
Allowance for doubtful accounts		(4,156	)		(1,749	)
Total accounts receivable	$	67,990		$	83,062

Balances billed, but not paid by customers under retainage provisions in contracts that are recorded in deferred charges and other assets within the Consolidated Balance Sheets, amounted to approximately $2.5 million and $3.2 million at December 31, 2017 and 2016, respectively. Retainage receivables on contracts in progress are generally collected within a year or two subsequent to contract completion.

Provision for doubtful accounts was approximately $3.9 million, $0.8 million and $0.7 million during 2017, 2016 and 2015, respectively, while accounts charged to the allowance were $1.5 million, $0.3 million and $0.2 million during 2017, 2016 and 2015, respectively.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Costs and Estimated Earnings on Uncompleted Contracts

12 Months Ended

Dec. 31, 2017

Text Block [Abstract]

Costs and Estimated Earnings on Uncompleted Contracts

4.	Costs and Estimated Earnings on Uncompleted Contracts

(Table only in thousands)	2017			2016
Costs incurred on uncompleted contracts	$	169,665		$	186,609
Estimated earnings		61,556			77,709
Total costs and estimated earnings on uncompleted contracts, gross		231,221			264,318
Less billings to date		(217,743	)		(261,280	)
Total costs and estimated earnings on uncompleted contracts, net	$	13,478		$	3,038
Included in the accompanying consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	$	33,947		$	38,123
Billings in excess of costs and estimated earnings on uncompleted contracts		(20,469	)		(35,085	)
Total costs and estimated earnings on uncompleted contracts, net	$	13,478		$	3,038

The Company’s contracts have various lengths to completion ranging from a few days to several months. The Company anticipates that a majority of our current contracts will be completed within the next 12 months.

Inventories

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventories

5.	Inventories

Inventories consisted of the following:

(Table only in thousands)	2017			2016
Raw materials	$	18,444		$	17,889
Work in process		3,182			3,986
Finished goods		940			1,508
Obsolescence allowance		(1,597	)		(1,896	)
Total inventories	$	20,969		$	21,487

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $(0.2) million, $(1.2) million and $(0.7) million during 2017, 2016 and 2015, respectively. Items charged to the allowance for inventory write-offs were $0.6 million, $0.2 million and $0.2 million, during 2017, 2016 and 2015, respectively.

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

6.	Property, Plant and Equipment

(Table only in thousands)	2017			2016
Land	$	1,627		$	1,617
Building and improvements		18,063			19,887
Machinery and equipment		25,068			22,219
Property, plant and equipment, gross		44,758			43,723
Less accumulated depreciation		(21,358	)		(16,453	)
Property, plant and equipment, net	$	23,400		$	27,270

Depreciation expense was $4.5 million, $5.0 million and $4.2 million for 2017, 2016 and 2015, respectively.

Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

7.	Goodwill and Intangible Assets

(Table only in thousands)	Energy Segment			Environmental Segment			Fluid Handling and Filtration Segment			Totals
Balance of goodwill at December 31, 2015	$	72,075		$	55,031		$	93,057		$	220,163
2016 acquisition related adjustments		4,205			—			—			4,205
Impairment charge		—			(6,828	)		(46,934	)		(53,762	)
Foreign currency translation		(453	)		—			—			(453	)
Balance of goodwill at December 31, 2016		75,827			48,203			46,123			170,153
Impairment charge		(4,443	)		—			—			(4,443	)
Foreign currency translation		1,241			—			—			1,241
Balance of goodwill at December 31, 2017	$	72,625		$	48,203		$	46,123		$	166,951

As of December 31, 2017 and 2016, the Company has an aggregate amount of goodwill acquired of $242.3 million and $241.1 million, respectively, and an aggregate amount of impairment losses of $75.3 million and $70.9 million, respectively.

2016 acquisition related adjustments consisted of the finalization of the purchase accounting for PMFG. These adjustments included decreases of $5.5 million to property and equipment and $1.7 million to current assets partially offset by decreases of $1.1 million to the deferred income tax liability and $1.8 million to the noncontrolling interest.

The Company’s indefinite lived intangible assets as of December 31, 2017 and 2016 consisted of the following:

	Tradenames
(Table only in thousands)	2017			2016
Beginning balance	$	22,042		$	26,337
Impairment charge		(2,725	)		(4,161	)
Foreign currency adjustments		374			(134	)
Total indefinite lived intangible assets	$	19,691		$	22,042

The Company completes an annual (or more often if circumstances require) impairment assessment of its goodwill and indefinite life intangible assets on October 1 at the reporting unit level. Effective January 1, 2017, the Company prospectively adopted accounting guidance that simplifies goodwill impairment testing by eliminating the requirement to calculate the implied fair value of goodwill (formerly “Step 2”) in the event that an impairment is identified. Instead, an impairment charge is recorded based on the excess of the reporting unit’s carrying amount over its fair value. Prior to 2017, a goodwill impairment test as described in FASB ASC 350-20-35 was performed for all reporting units.

The Company bases its measurement of the fair value of a reporting unit using a weighting of the income method and the market method on a 50/50 basis. The income method is based on a discounted future cash flow approach that uses the significant assumptions of projected revenue, projected operational profit, terminal growth rates, and the cost of capital. Projected revenue, projected operational profit and terminal growth rates were determined to be significant assumptions because they are three primary drivers of the projected cash flows in the discounted future cash flow approach. Cost of capital was also determined to be a significant assumption as it is the discount rate used to calculate the current fair value of those projected cash flows. The market method is based on financial multiples of comparable companies and applies a control premium. Significant estimates in the market approach include identifying similar companies with comparable business factors such as size, growth, profitability, risk and return on investment and assessing comparable revenue and operating income multiples in estimating the fair value of a reporting unit.

Based on the analysis, the resultant estimated fair value of the reporting units for all but the Zhongli reporting unit exceeded their carrying value as of October 1, 2017. The impairment test indicated full goodwill impairment for one reporting unit of $4.4 million, which was recorded in the fourth quarter of fiscal 2017. The impairment was due to lower projected operating performance due primarily to the declining coal market in China. This reporting unit is included in the Energy segment.

In the 2017 impairment analysis for reporting unit one, two and three, which as of December 31, 2017, carry goodwill of $32.4 million, $59.9 million and $5.7 million, and the fair value only exceeded the carrying value by 6%, 3% and 2%, respectively. The reporting units were acquired in 2014, 2015 and 2007, respectively, reporting unit one is reported within the Environmental segment while reporting unit two and three are reported within the Energy segment. Management’s projections used to estimate the undiscounted cash flows included increasing sales volumes and operational improvements designed to reduce costs. Changes in any of the significant assumptions used, including if the Company does not successfully achieve its 2018 operating plan, can materially affect the expected cash flows, and such impacts can result in a potentially material non-cash impairment charge. Therefore, the key assumptions most susceptible to change are projected revenue and projected operational profit. We determined that with other assumptions held constant under our weighted income and market method for measuring fair value, a decrease in projected revenue growth rates of approximately 11 basis points, 4 basis points and 1 basis point or a decrease in projected operational profit growth rates of approximately 65 basis points, 16 basis points and 20 basis points for reporting unit one, two and three would result in fair value of the reporting unit being equal to its carrying value.

The Company also performed an impairment analysis for all reporting units with indefinite life intangible assets. The Company based its measurement of the fair value of the indefinite life intangible assets utilizing the relief from royalty method. The significant assumptions used under the relief from royalty method are projected revenue, royalty rates, terminal growth rates, and the cost of capital. Projected revenue, royalty rates and terminal growth rates were determined to be significant assumptions because they are three primary drivers of the projected royalty cash flows in the relief from royalty method. Cost of capital was also determined to be a significant assumption as it is the discount rate used to calculate the current fair value of those projected royalty cash flows. Changes in any of the significant assumptions used can materially affect the expected cash flows, and such impacts can result in material non-cash impairment charges. Under this approach, the resultant estimated fair value of the indefinite life intangible assets exceeded their carrying value for all but four reporting units as of December 31, 2017. For four of the reporting units, which carried combined indefinite life intangible assets of $13.1 million, our fair value measurement resulted in the aggregate fair value being 20.7% lower than the aggregate carrying value. Accordingly, we recorded an impairment charge of $2.7 million during the year ended December 31, 2017. The Zhongli reporting unit with indefinite life intangible asset impairment of $0.9 million, respectively, was acquired in the second half of fiscal 2014. Reporting unit two with indefinite life intangible asset impairment of $1.0 million was acquired in the second half of 2015. Reporting unit three with indefinite life intangible asset impairment of $0.3 million was acquired in 2007. Reporting unit four with indefinite life intangible asset impairment of $0.5 million was acquired in the second half of 2013. The Zhongli and reporting units two, three and four are reported within the Energy Segment. Management’s projections used to estimate the fair values at the date of acquisition primarily included increasing sales volumes; however, the units have experienced lower sales than originally projected.

As a result of the impairments noted above, the Company concluded there was a triggering event that required an impairment test to be performed to support the definite lived intangible assets and other long-lived assets carrying value. An undiscounted cash flow analysis was performed at the lowest level of cash flows for each asset group and the sum of the undiscounted cash flows exceeded the long-lived assets’ carrying values. As a result of this analysis, no impairment related to these assets was recorded in 2017.

During the annual impairment test of indefinite life intangible assets in 2016 and 2015, the carrying values of four and three, respectively, reporting units’ indefinite life intangible assets exceeded their fair values. The Company recorded a $4.2 million and $3.3 million impairment charge during the years ended December 31, 2016 and 2015, respectively. There was goodwill impairment of $53.8 million in the year ended December 31, 2016 and no goodwill impairment in the year ended December 31, 2015.

As described above, the fair value measurement methods used in the Company’s goodwill and indefinite life intangible assets impairment analyses utilizes a number of significant unobservable inputs or Level 3 assumptions. These assumptions include, among others, projections of our future operating results, the implied fair value of these assets using an income approach by preparing a discounted cash flow analysis and other subjective assumptions.

The Company’s finite lived intangible assets as of December 31, 2017 and 2016 consisted of the following:

	2017						2016
(Table only in thousands) Intangible assets – finite life	Cost			Accum. Amort.			Cost			Accum. Amort.
Technology	$	15,867		$	8,609		$	15,867		$	6,360
Customer lists		77,497			35,024			77,497			26,041
Noncompetition agreements		1,118			698			1,118			478
Tradename		1,390			440			1,390			301
Foreign currency adjustments		(1,214	)		(69	)		(2,964	)		(1,000	)
Total finite life intangible assets	$	94,658		$	44,702		$	92,908		$	32,180

Amortization expense of finite life intangible assets was $11.5 million, $13.9 million and $12.3 million for 2017, 2016 and 2015, respectively. Amortization over the next five years for finite life intangibles is $10.1 million in 2018, $8.9 million in 2019, $7.2 million in 2020, $5.9 million in 2021, and $4.9 million in 2022.

The weighted average amortization period for the finite lived intangible assets acquired in fiscal 2015 is 8.7 years.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Accounts Payable and Accrued Expenses

12 Months Ended

Dec. 31, 2017

Payables And Accruals [Abstract]

Accounts Payable and Accrued Expenses

8.	Accounts Payable and Accrued Expenses

(Table only in thousands)	2017		2016
Trade accounts payable, including amounts due to subcontractors	$	45,409	$	58,985
Compensation and related benefits		5,246		8,232
Current portion of earnout liability		2,989		13,527
Accrued warranty		4,464		2,684
Other		12,678		12,182
Total accounts payable and accrued expenses	$	70,786	$	95,610

The activity in the Company’s current portion of earnout liability and long term portion of earnout liability was as follows for the twelve months ended December 31, 2017 and 2016:

(Table only in thousands)	Energy Segment			Environmental Segment		Total (1)
Earnout accrued at December 31, 2016	$	24,213		$	—	$	24,213
Fair value adjustment		(6,610	)		—		(6,610	)
Compensation expense adjustment		1,240			—		1,240
Foreign currency translation adjustment		825			—		825
Payment		(15,193	)		—		(15,193	)
Total earnout liability as of December 31, 2017	$	4,475		$	—	$	4,475
Less: current portion of earnout		(2,989	)		—		(2,989	)
Balance of long term portion of earnout recorded in other liabilities at December 31, 2017	$	1,486		$	—	$	1,486

(Table only in thousands)	Energy Segment			Environmental Segment			Total (1)
Earnout accrued at December 31, 2015	$	30,403		$	2,267		$	32,670
Fair value adjustment		6,485			(2,267	)		4,218
Compensation expense adjustment		1,213			—			1,213
Foreign currency translation adjustment		(1,346	)		—			(1,346	)
Exchange of earnout for accounts receivable		(3,272	)		—			(3,272	)
Payment		(9,270	)		—			(9,270	)
Total earnout liability as of December 31, 2016	$	24,213		$	—		$	24,213
Less: current portion of earnout		(13,527	)		—			(13,527	)
Balance of long term portion of earnout recorded in other liabilities at December 31, 2016	$	10,686		$	—		$	10,686


	(1)	The Fluid Handling and Filtration segment does not have any earnout arrangements associated with the segment.

Senior Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Senior Debt

9.	Senior debt

Debt consisted of the following at December 31, 2017 and 2016:

(Table only in thousands)	2017			2016
Outstanding borrowings under Credit Facility (defined below). Term loan payable in quarterly principal installments of $2.0 million through September 2018, $2.5 million thereafter with balance due upon maturity in September 2020.
– Term loan	$	113,903		$	125,072
– U.S. Dollar revolving loans		1,000			—
– Unamortized debt discount		(2,834	)		(3,175	)
Total outstanding borrowings under Credit Facility		112,069			121,897
Outstanding borrowings (U.S. dollar equivalent) under China Facility (defined below)		—			1,296
Outstanding borrowings (U.S. dollar equivalent) under Aarding Facility (defined below)		2,764			—
Total outstanding borrowings	$	114,833		$	123,193
Less: current portion		11,296			8,827
Total debt, less current portion	$	103,537		$	114,366

During the year ended December 31, 2017, the Company made prepayments of $4.3 million on the outstanding balance of the term loan. Scheduled principal payments under our Credit Facility are $8.5 million in 2018, $10.0 million in 2019, and $96.4 million in 2020.

United States Debt

The Company entered into a credit agreement (the “Credit Agreement”) with various lenders (the “Lenders”) and letter of credit issuers (each, an “L/C Issuer”), and Bank of America, N.A., as Administrative Agent (the “Agent”), swing line lender and an L/C Issuer, providing for various senior secured credit facilities (collectively, the “Credit Facility”).

On September 3, 2015, concurrent with the closing of the PMFG acquisition, the Company amended and restated the Credit Agreement. Pursuant to the amended and restated Credit Agreement, the Lenders provided a term loan in an aggregate principal amount of $170.0 million and the Lenders decreased their senior secured U.S. dollar revolving credit commitments to the aggregate principal amount of $60.5 million. All other provisions of the agreement remained substantially unchanged, including the $19.5 million senior secured multi-currency revolving credit facility for U.S. dollar and specific foreign currency loans. The proceeds from the increased term loan were used primarily to (i) finance the cash portion of the PMFG purchase price, (ii) pay off certain outstanding indebtedness of the Company and its subsidiaries (including certain indebtedness of PMFG and its subsidiaries), and (iii) pay certain fees and expenses incurred in connection with the amendment to the Credit Agreement and the PMFG acquisition.

The Company amended the Credit Facility as of June 9, 2017. The Credit Facility was amended to, among other things, (a) modify the calculation of Consolidated EBITDA and Consolidated Fixed Charges to exclude certain pro forma adjustments related to certain acquisitions and other transactions and (b) modify the Consolidated Leverage Ratio covenant.

The Company amended the Credit Facility as of October 31, 2017. The Credit Facility was amended to, among other things, (a) modify the calculation of Consolidated EBITDA and Consolidated Fixed Charges to exclude certain adjustments related to certain transactions (b) modify the Consolidated Leverage Ratio covenant and (c) add a covenant restricting the amount of capital expenditures we may make in fiscal years 2018 and 2019. As a result of the amendment to the Credit Facility, the maximum consolidated leverage ratio increased from 3.25 to 3.75 and will remain constant at this ratio through March 31, 2019, when it is set to decrease to 3.50 through September 30, 2019. The Consolidated Leverage Ratio will then decrease to 3.25 where it will remain until the end of the term of the Credit Facility.

As of December 31, 2017 and 2016, $24.4 million and $18.0 million of letters of credit were outstanding, respectively. Total unused credit availability under the Credit Facility was $54.6 million and $62.0 million at December 31, 2017 and 2016, respectively. Revolving loans may be borrowed, repaid and reborrowed until September 3, 2020, at which time all amounts borrowed pursuant to the Credit Facility must be repaid.

At the Company’s option, revolving loans and the term loans accrue interest at a per annum rate based on either the highest of (a) the federal funds rate plus 0.5%, (b) the Agent’s prime lending rate, and (c) one-month LIBOR plus 1.00%, plus a margin ranging from 1.0% to 2.0% depending on the Company’s consolidated leverage ratio (“Base Rate”), or a Eurocurrency Rate (as defined in the Credit Agreement) plus 2.0% to 3.0% depending on the Company’s consolidated leverage ratio. Interest on swing line loans is the Base Rate.

Accrued interest on Base Rate loans is payable quarterly in arrears on the last day of each calendar quarter and at maturity. Interest on Eurocurrency Rate loans is payable on the last date of each applicable Interest Period (as defined in the agreement), but in no event less than once every three months and at maturity. The weighted average interest rate on outstanding borrowings was 4.08% and 3.26% at December 31, 2017 and 2016, respectively.

In accordance with the Credit Facility terms, the Company entered into an interest rate swap on December 30, 2015 to hedge against interest rate exposure related to approximately one-third of the outstanding debt as of the date of the agreement indexed to LIBOR market rates. The fair value of the interest rate swap was a $0.3 million asset and a $0.2 million liability at December 31, 2017, and 2016, respectively, which is recorded in “Deferred charges and other assets” on the Consolidated Balance Sheets. The Company did not designate the interest rate swap as an effective hedge until the first quarter of 2016. The change in the fair value of the hedge prior to being designated as an effective hedge during the year ended December 31, 2016 of $0.5 million, was recorded in earnings in “Other income (expense), net” in the Consolidated Statements of Operations. From the date of designation, all changes to the fair value of the interest rate swap are recorded in other comprehensive income (loss) as long as the hedge is deemed effective.

The Company has granted a security interest in substantially all of its assets to secure its obligations pursuant to the Credit Agreement. The Company’s obligations under the Credit Agreement are guaranteed by the Company’s U.S. subsidiaries and such guaranty obligations are secured by a security interest on substantially all of the assets of such subsidiaries, including certain real property. The Company’s obligations under the Credit Agreement may also be guaranteed by the Company’s material foreign subsidiaries to the extent no adverse tax consequences would result to the Company.

As of December 31, 2017 and 2016, the Company was in compliance with all related financial and other restrictive covenants under the Credit Facility.

Foreign Debt

A subsidiary of the Company located in the Netherlands has a Euro denominated facilities agreement with ING Bank N.V. as the lender (“Aarding Facility”) with a total borrowing capacity of $15.5 million. The facilities agreement consists of a $8.3 million bank guarantee facility and a $7.2 million overdraft facility. The bank guarantee interest rate is the three months Euribor plus 265 basis points (2.65% as of December 31, 2017 and 2016) and the overdraft interest rate is three months Euribor plus 195 basis points (1.95% as of December 31, 2017 and 2016). All of the borrowers’ assets are pledged for this facility, and the borrowers’ solvency ratio must be at least 30% and net debt/last twelve months EBITDA less than 3.0. The subsidiary of the Company located in the Netherlands has a Euro denominated debenture facility used to facilitate issuances of letters of credit and bank guarantees of December 31, 2017. As of December 31, 2017, $3.9 million of the bank guarantees and $2.8 million of the overdraft facility are being used by the borrowers. As of December 31, 2016, $5.3 million of the bank guarantee and zero of the overdraft facility are being used by the borrowers. There is no stated expiration date on the facilities agreement. As of December 31, 2016 the borrowers were in compliance with all related financial and other restrictive covenants. As of December 31, 2017, the borrowers were not in compliance with certain financial covenants under the Aarding Facility. As such, in March 2018, the Company settled the outstanding amount of $2.8 million of the overdraft facility, which is classified as current portion of debt in the Consolidated Balance Sheets. The Company plans to exit this facility and consolidate it with the existing Credit Facility.

A subsidiary of the Company located in China has a Chinese Yuan Renminbi denominated short term loan with Bank of America (“China Facility”) with amounts outstanding of zero and $1.3 million as of December 31, 2017 and 2016, respectively. The short term loan has a total borrowing capacity of $4.6 million and $4.3 million as of December 31, 2017 and 2016, respectively. The short term loan has an interest rate of 4.79%, and will expire on April 12, 2018 and will not be renewed.

A subsidiary of the Company located in the U.K. has a debenture agreement used to facilitate issuances of letters of credit and bank guarantees of $8.0 million and $9.0 million at December 31, 2017 and 2016. This agreement is currently denominated in US Dollars. This facility was secured by a protective letter of credit issued by the Company to HSBC Bank at December 31, 2017. At December 31, 2017 and 2016, there was $7.0 million and $6.2 million, respectively, of outstanding stand-by letters of credit and bank guarantees under this debenture agreement.

A subsidiary of the Company located in Germany has a Euro denominated debenture agreement used to facilitate issuances of letters of credit and bank guarantees of $0.2 million and $0.9 million at December 31, 2017 and 2016, respectively. This facility is secured by cash deposits of $0.2 million and $0.9 million at December 31, 2017 and 2016, respectively. There were $0.2 million and $0.9 million of outstanding stand-by letters of credit and bank guarantees under this debenture agreement as of December 31, 2017 and 2016, respectively.

A subsidiary of the Company located in Singapore had bank guarantees of $1.0 million and $1.7 million at December 31, 2017 and December 31, 2016, respectively. These guarantees are secured with cash deposits of $0.1 million and $0.3 million as of December 31, 2017 and December 31, 2016, respectively, and a protective letter of credit issued by the Company to Citibank.

As of December 31, 2017 and 2016, $3.9 million and $5.3 million of letters of credit were outstanding under the Netherlands and China facilities, respectively. Total unused credit availability under the Netherlands and China facilities was $13.5 million and $11.4 million at December 31, 2017 and 2016, respectively.

Shareholders' Equity

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Shareholders' Equity

10.	Shareholders’ Equity

Dividends

Our dividend policy and the payment of cash dividends under that policy are subject to the Board of Director’s continuing determination that the dividend policy and the declaration of dividends are in the best interest of the Company’s shareholders. Future dividends and the dividend policy may be changed or cancelled at the Company’s discretion at any time. Payment of dividends is also subject to the continuing compliance with our financial covenants under our Credit Facility. On November 6, 2017, the Board of Directors reviewed the Company’s dividend policy and determined that it would be in the best interest of the stockholders to suspend dividend payments.

During 2017, 2016 and 2015, our Board declared the following quarterly cash dividends on our common stock:

Dividend Per Share	Record Date	Payment Date
$0.075	August 7, 2017	September 29, 2017
$0.075	May 10, 2017	June 30, 2017
$0.075	March 6, 2017	March 31, 2017
$0.066	December 16, 2016	December 30, 2016
$0.066	September 16, 2016	September 30, 2016
$0.066	June 18, 2016	June 30, 2016
$0.066	March 18, 2016	March 31, 2016
$0.066	December 16, 2015	December 30, 2015
$0.066	September 18, 2015	September 30, 2015
$0.066	June 12, 2015	June 26, 2015
$0.066	March 19, 2015	March 31, 2015

Effective August 13, 2012, the Company implemented a Dividend Reinvestment Plan (the “Plan”), under which the Company may issue up to 750,000 shares of common stock. The Plan provides a way for interested shareholders to increase their holdings in our common stock. Participation in the Plan is strictly voluntary and is open only to existing shareholders. The Plan has had limited participation.

Share-Based Compensation

The Company’s 2017 Equity and Incentive Compensation Plan (the “2017 Plan”) was approved by the Company’s stockholders on May 16, 2017 and replaced the 2007 Equity Incentive Plan. The 2017 Plan permits the granting of stock options, which are granted with an exercise price equal to or greater than the fair market value of the Company’s common stock at the date of the grant, and other stock-based awards, including appreciation rights, restricted stock, restricted stock units, performance shares and dividend equivalents. A total of 1.9 million shares of common stock were authorized for issuance. As of December 31, 2017 a total of 2.0 million shares remain available for future issuance due to forfeitures under the 2007 Equity Incentive Plan. Stock options granted to employees generally vest equally over a period of four years from the date of the grant. Stock awards granted to employees generally vest over a period of three to four years from the date of the grant. During 2017, approximately 128,000 stock options and 351,000 restricted stock awards were granted to plan participants under the 2017 plan.

On June 10, 2017, the Company granted 700,000 performance units to our Chief Executive Officer whose total value was determined to be $175,000 and will be expensed over the vesting period of three years. The maximum shares of common stock that the participant could receive upon his performance units vesting is 77,778 shares. The performance units are earned based upon the Company’s stock price during 30 consecutive trading days within a specified date range of approximately two years. The performance units are settled in the Company’s common stock subsequent to this specified date range and vest approximately three years from the date of the grant. The estimated grant date fair value and compensation expense of each performance share is determined on the date of grant by using the Monte Carlo valuation model.

The 2007 Equity Incentive Plan (the “2007 Plan”) was approved by shareholders on May 23, 2007. As of May 16, 2017, no further grants will be made under the 2007 Plan, but outstanding awards under the 2007 Plan prior to such date will continue to be unaffected in accordance with their terms. The 2007 Plan permits the granting of stock options and stock awards which are granted at a price equal to or greater than the fair market value of the Company’s common stock at the date of the grant. Stock options granted to employees generally vest equally over a period of three to five years from the date of the grant. Stock awards granted to employees generally vest equally over a period of four to five years from the date of the grant. During 2017, no stock options and approximately 54,000 restricted stock awards were granted to plan participants under the 2007 Plan. During 2016, approximately 105,000 stock options and 267,000 restricted stock awards were granted to plan participants under the 2007 Plan. The awards outstanding are service based awards that vest over a service period. The number of shares reserved for issuance under the 2007 Plan is 3,300,000, of which approximately 414,000 shares were available for future grant as of December 31, 2016.

There were approximately 53,000 performance-based awards outstanding at December 31, 2016, which were forfeited in 2017.

Share-based compensation expense for stock options and restricted stock awards under these plans of $1.7 million, $2.2 million and $1.9 million was recorded in the years ended December 31, 2017, 2016 and 2015, respectively. The tax benefit related to share based compensation expense was zero, $0.2 million and zero in 2017, 2016 and 2015, respectively.

Employee Stock Purchase Plan

The 2009 Employee Stock Purchase Plan (“ESPP”) was approved by shareholders on May 21, 2009.

The ESPP is administered by the Compensation Committee. The aggregate maximum number of shares of the Company’s common stock that may be granted under the ESPP is 1,500,000 shares over the ten-year term of the ESPP, subject to adjustment in the event there is a reorganization, merger, consolidation, recapitalization, reclassification, stock split-up, or similar transaction with respect to the common stock. As of December 31, 2017 a total of 1.4 million shares remain available for future issuance.

The ESPP allows employees to purchase shares of common stock at a 15% discount from market price and pay for the shares through payroll deductions. Eligible employees can enter the plan at specific “offering dates” that occur in six month intervals.

The Company recognized employee stock purchase plan expense of $83,000, $71,000 and $54,000 during the years ended December 31, 2017, 2016 and 2015, respectively.

Stock Options and Restricted Awards

The weighted-average fair value of stock options granted during 2017, 2016, and 2015 was estimated at $2.68, $2.07 and $4.35 per option, respectively, using the Black-Scholes option-pricing model based on the following assumptions:

Expected Volatility: The Company utilizes a volatility factor based on the Company’s historical stock prices for a period of time equal to the expected term of the stock option utilizing weekly price observations. For 2017, 2016, and 2015, the Company utilized weighted-average volatility factors of 39%, 39% and 44%, respectively.

Expected Term: Due to limited historical exercise data, the Company utilizes the simplified method of determining the expected term based on the vesting schedules and terms of the stock options. For 2017, 2016 and 2015, the Company utilized weighted-average expected term factors of 6.3 years, 6.5 years and 6.3 years, respectively.

Risk-Free Interest Rate: The risk-free interest rate factor utilized is based upon the implied yields currently available on U.S. Treasury zero-coupon issues over the expected term of the stock options. For 2017, 2016 and 2015, the Company utilized a weighted-average risk-free interest rate factor of 2.2%, 2.1% and 1.9%, respectively.

Expected Dividends: The Company utilized a weighted average expected dividend rate of 3.3%, 3.6% and 2.4% to value options granted during 2017, 2016 and 2015, respectively.

Information related to all stock options under the 2017 Plan, 2007 Plan and 1997 Plan for the years ended December 31, 2017, 2016 and 2015 is shown in the tables below:

(Shares in thousands)	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2016		1,519			10.25	6.1 years
Granted		128			9.24
Forfeitures		(700	)		12.44
Exercised		(292	)		3.92
Outstanding at December 31, 2017		655			10.53	6.0 years	$	78
Exercisable at December 31, 2017		463			10.49	5.2 years	$	78

(Shares in thousands)	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2015		1,877		$	10.30	6.8 years
Granted		105			7.36
Forfeitures		(268	)		11.91
Exercised		(195	)		6.90
Outstanding at December 31, 2016		1,519			10.25	6.1 years	$	5,816
Exercisable at December 31, 2016		959			9.23	5.3 years	$	4,608

(Shares in thousands)	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2014		1,727		$	10.12	7.3 years
Granted		286			11.55
Forfeitures		(106	)		12.31
Exercised		(30	)		4.47
Outstanding at December 31, 2015		1,877			10.30	6.8 years	$	1,769
Exercisable at December 31, 2015		977			8.48	5.4 years	$	1,765

Information related to all restricted stock awards under the 2017 Plan and 2007 Plan for the year ended December 31, 2017 is shown in the table below. The fair value of restricted stock awards is based on the price of the stock in the open market on the date of the grant. The fair value of the restricted stock awards is recorded as compensation expense on a straight-line basis over the vesting periods of the awards and account for forfeitures when they occur.

(Shares in thousands)	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2016		509		$	9.64
Granted		405			9.88
Vested		(92	)		9.78
Forfeited		(268	)		9.70
Nonvested at December 31, 2017		554			9.75

The weighted average grant date fair value of restricted stock awards granted was $9.88, $9.76 and $9.48 per share in fiscal years 2017, 2016 and 2015.

The Company received $1.1 million in cash from employees exercising options during the year ended December 31, 2017, $1.3 million in cash from employees exercising options during the year ended December 31, 2016 and $0.1 million from employees exercising options during the year ended December 31, 2015. The intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 was $2.6 million, $1.0 million and $0.2 million, respectively. Unrecognized compensation expense related to nonvested shares of stock options, restricted stock and performance units was $5.0 million at December 31, 2017 and will be recognized over a weighted average vesting period of 2.7 years.

Warrants to Purchase Common Stock

The Company has previously issued warrants to purchase common shares in conjunction with business acquisitions, debt issuances and employment contracts.

On December 28, 2006, the Company issued warrants to purchase 250,000 shares to Icarus Investment Corp. (“Icarus”), a related party, at an exercise price of $9.07 and an expiration date of December 26, 2016. On December 7, 2016, the Company and Icarus entered into an amendment of the warrant agreement pursuant to which the warrants were issued to provide for the cashless exercise of the warrants. During the year ended December 31, 2016, all of the Company’s previously outstanding warrants were exercised and the Company issued 89,640 shares of common stock through a cashless exercise pursuant to such amendment at an effective price of $9.07 per share. As of December 31, 2017 and 2016, there were zero warrants outstanding.

Stock Purchase

During 2016, the Company repurchased 30,000 shares of common stock from a former owner of a subsidiary acquired by the Company in 2014 for a total cost of $0.2 million. In December 2016, the Company entered into an agreement to repurchase 75,000 shares of common stock from a current segment president, who is a former owner of a subsidiary acquired by the Company in 2013, for a total cost of $1.1 million, which was paid in January 2017. This transaction is reflected in the accounts payable and accrued expenses line in the Consolidated Balance Sheets as of December 31, 2016. The shares were immediately retired subsequent to their repurchase. There were no stock repurchases during 2017 or 2015.

Pension and Employee Benefit Plans

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Pension and Employee Benefit Plans

11.	Pension and Employee Benefit Plans

We sponsor a non-contributory defined benefit pension plan for certain union employees. The accrual of future benefits for all participants who are non-union employees was frozen effective December 31, 2008. The plan is funded in accordance with the funding requirements of the Employee Retirement Income Security Act of 1974.

We also sponsor a postretirement health care plan for office employees retired before January 1, 1990. The plan allows retirees who have attained the age of 65 to elect the type of coverage desired.

The following tables set forth the plans’ changes in benefit obligations, plan assets and funded status on the measurement dates, December 31, 2017, 2016 and 2015, and amounts recognized in our Consolidated Balance Sheets within other long-term liabilities as of those dates.

	Pension Benefits									Other Benefits
(Table only in thousands)	2017			2016			2015			2017			2016			2015
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	35,012		$	36,140		$	38,208			n/a			n/a			n/a
Accumulated postretirement benefit obligation		n/a			n/a			n/a			131		$	159		$	155
Service cost		415			447			233			—			—			—
Interest cost		1,314			1,426			1,412			4			4			5
Amendments		—			—			—			—			—			9
Actuarial loss/(gain)		1,787			301			(1,744	)		3			(8	)		18
Administrative expenses		(402	)		(606	)		(214	)		—			—			—
Benefits paid		(1,799	)		(2,696	)		(1,755	)		(26	)		(24	)		(28	)
Projected benefit obligation at end of year		36,327			35,012			36,140			112			131			159
Change in plan assets:
Fair value of plan assets at beginning of year		24,063			25,296			27,302			—			—			—
Actual return (loss) on plan assets		3,152			2,040			(443	)		—			—			—
Employer contribution		1,822			29			406			26			24			28
Administrative expenses		(402	)		(606	)		(214	)		—			—			—
Benefits paid		(1,799	)		(2,696	)		(1,755	)		(26	)		(24	)		(28	)
Fair value of plan assets at end of year		26,836			24,063			25,296			—			—			—
Unfunded status	$	(9,491	)	$	(10,949	)	$	(10,844	)	$	(112	)	$	(131	)	$	(159	)
Defined benefit liabilities included in accounts payable and accrued expenses	$	—		$	—		$	—		$	(24	)	$	(25	)	$	(26	)
Defined benefit liabilities included in other liabilities		(9,491	)		(10,949	)		(10,844	)		(88	)		(106	)		(133	)
Deferred tax benefit associated with accumulated other comprehensive loss		3,153			3,107			3,154			12			15			15
Accumulated other comprehensive loss, net of tax		5,154			5,074			5,144			7			9			27
Net amount recognized	$	(1,184	)	$	(2,768	)	$	(2,546	)	$	(93	)	$	(107	)	$	(117	)
Other comprehensive income (loss):
Net loss (gain)	$	358		$	90		$	708		$	3		$	(9	)	$	17
Prior service cost		—			—			—			—			—			9
Amortization of prior service cost		—			—			—			(11	)		(10	)		(9	)
Amortization of net actuarial (gain)/loss		(227	)		(212	)		(258	)		3			1			3
Total recognized in other comprehensive income (loss)	$	131		$	(122	)	$	450		$	(5	)	$	(18	)	$	20
Accumulated other comprehensive income:
Net loss (gain)	$	8,307		$	8,181		$	8,298		$	(22	)	$	(28	)	$	(20	)
Prior service cost		—			—			—			41			52			62
Amount recognized in accumulated other comprehensive income	$	8,307		$	8,181		$	8,298		$	19		$	24		$	42
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate		3.35	%		3.85	%		4.00	%		2.65	%		2.75	%		3.00	%
Compensation increase rate		n/a			n/a			n/a			n/a			n/a			n/a

Benefits under the plans are not based on wages and, therefore, future wage adjustments have no effect on the projected benefit obligations.

During 2017, 2016 and 2015, the Company updated the mortality tables (RP-2017 Total Mortality Table, RP-2016 Total Mortality Table, and RP-2015 Total Mortality Table for each respective year) in the underlying assumptions used to determine benefit obligations.

Included in other comprehensive income for our defined benefit plans, net of related tax effect, were an increase in the minimum liability of $0.1 million in 2017, a decrease of $0.1 million in 2016 and an increase of $0.3 million in 2015.

The details of net periodic benefit cost for pension benefits included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2017, 2016 and 2015 are as follows:

(Table only in thousands)	2017			2016			2015
Service cost	$	415		$	447		$	233
Interest cost		1,314			1,426			1,412
Expected return on plan assets		(1,723	)		(1,829	)		(2,009	)
Net amortization and deferral		227			212			258
Net periodic benefit cost (income)	$	233		$	256		$	(106	)
Weighted-average assumptions used to determine net periodic benefit costs for the years ended December 31:
Discount rate		3.85	%		4.00	%		3.75	%
Expected return on assets		7.25	%		7.50	%		7.50	%
Compensation increase rate		n/a			n/a			n/a

The basis of the long-term rate of return assumption reflects the current asset mix for the pension plans of approximately 30% to 40% debt securities and 60% to 70% equity securities with assumed average annual returns of approximately 4% to 6% for debt securities and 8% to 12% for equity securities. The investment portfolio for the pension plans will be adjusted periodically to maintain the current ratios of debt securities and equity securities. Additional consideration is given to the historical returns for the pension plan as well as future long range projections of investment returns for each asset category.

The net loss and prior service cost for the defined benefit pension plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2018 are $0.2 million and zero, respectively. The net gain and prior service cost for the healthcare plan that will be amortized from accumulated other comprehensive income into net periodic benefit cost during 2018 is $2,000 and $11,000, respectively.

At December 31, 2017, a 25 basis point change in the discount rate would change the projected benefit obligation by approximately $1.1 million in the Projected Benefit Obligation and would change Net Periodic Pension Cost by approximately $9,000. Additionally, a 25 basis point change in the assumed long-term rate of return on assets would impact Net Periodic Pension Cost by approximately $66,000.

The net periodic benefit cost (representing interest cost and amortization of net actuarial loss only) for the healthcare plan included in the accompanying Consolidated Statements of Operations was $11,000, $15,000 and $12,000 for the years ended December 31, 2017, 2016 and 2015, respectively. The weighted average discount rate to determine the net periodic benefit cost for 2017, 2016 and 2015 was 2.75%, 3.00% and 3.75%, respectively.

Changes in health care costs have no effect on the plan as future increases are assumed by the retirees.

Pension plan assets are invested in trusts comprised primarily of investments in various debt and equity funds. A fiduciary committee establishes the target asset mix and monitors asset performance. The expected rate of return on assets includes the determination of a real rate of return for equity and fixed income investment applied to the portfolio based on their relative weighting, increased by an underlying inflation rate. Our defined benefit pension plan asset allocation by asset category is as follows:

	Target Allocation			Percentage of Plan Assets
	2017			2017			2016
Asset Category:
Cash and cash equivalents		0	%		4	%		4	%
Equity securities		70	%		70	%		67	%
Debt securities		30	%		26	%		29	%
Total		100	%		100	%		100	%

Estimated pension plan cash obligations are $1.9 million, $2.1 million, $2.2 million, $2.1 million, and $2.2 million for 2018 through 2022, respectively, and a total of $10.7 million for the years 2023 through 2026. Estimated healthcare plan cash obligations are $24,000, $20,000, $17,000, $14,000, and $11,000 for 2018 through 2022, respectively, and a total of $30,000 for the years 2023 through 2027.

Fair Value Measurements of Pension Plan Assets

Following is a description of the valuation methodologies used for pension assets measured at fair value:

•

Cash and cash equivalents: Cash and cash equivalents consist primarily of cash on deposit in money market funds. Cash and cash equivalents are stated at cost, which approximates fair value.

•

Equity securities: Equity securities consist of various managed funds that invest primarily in common stocks. These securities are valued at the net asset value of shares held by the plans at year-end. The net asset value is calculated based on the underlying shares and investments held by the funds.

•

Debt securities: Debt securities consist of U.S. government and agency securities, corporate bonds and notes, and managed funds that invest in fixed income securities. U.S governmental and agency securities are valued at closing prices reported in the active market in which the individual securities are traded. Corporate bonds and notes are valued using market inputs including benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including market research publications. Inputs may be prioritized differently at certain times based on market conditions. Managed funds are valued at the net asset value of shares held by the plans at year end. The net asset value is calculated based on the underlying investments held by the fund.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of the fair value of assets and liabilities and their placement within the fair value hierarchy levels.

The levels assigned to the defined benefit plan assets as of December 31, 2017, are summarized in the tables below:

(Table only in thousands)	Level 1		Level 2		Level 3		Total
Pension assets, at fair value:
Cash and cash equivalents	$	1,147	$	—	$	—	$	1,147
Equity securities		18,723		—		—		18,723
Debt securities		6,967		—		—		6,967
Total assets	$	26,836	$	—	$	—	$	26,836

The levels assigned to the defined benefit plan assets as of December 31, 2016, are summarized in the tables below:

(Table only in thousands)	Level 1		Level 2		Level 3		Total
Pension assets, at fair value:
Cash and cash equivalents	$	894	$	—	$	—	$	894
Equity securities		16,153		—		—		16,153
Debt securities		7,016		—		—		7,016
Total assets	$	24,063	$	—	$	—	$	24,063

The Company contributes to a number of multiemployer defined benefit pension plans under the terms of collective-bargaining agreements that cover its union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following aspects:

•

Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.

•

If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.

•

If the Company chooses to stop participating in some of its multiemployer plans, CECO may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.

The Company participation in these plans for the annual period ended December 31, 2017, is outlined in the table below. The “EIN/Pension Plan Number” column provides the Employer Identification Number and the three-digit plan number, if applicable. Unless otherwise noted, the most recent Pension Protection Act zone status available in 2017, 2016 and 2015 is for the plan’s year-end at December 31, 2016, December 31, 2015 and December 31, 2014, respectively. The zone status is based on information that the Company received from the plan and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65% funded, plans in the yellow zone are less than 80% funded, and plans in the green zone are at least 80% funded. The “FIP/RP Status Pending/Implemented” column indicates plans for which a financial improvement plan (FIP) or a rehabilitation plan (RP) is either pending or has been implemented. The last column lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject.

Pension Fund	EIN/Pension Plan Number	Pension Protection Act Zone Status	FIP/RP Status Pending/ Implemented	Surcharge Imposed	Expiration of Collective Bargaining Agreement
Sheet Metal Workers’ National Pension Fund	52-6112463/001	Yellow	FIP: Yes - Implemented RP: Yes - Implemented	No	various
Sheet Metal Workers Local 224 Pension Plan	31-6171353/001	Yellow	FIP: Yes - Implemented	No	May 31, 2018
Sheet Metal Workers Local No. 20, Indianapolis Area Pension fund	51-0168516/001	Green	Is not subject	No	May 31, 2020
Sheet Metal Workers Local No. 177 Pension Fund	62-6093256/001	Green	Is not subject	No	May 1, 2018

Kirk and Blum was listed in the Sheet Metal Workers Local No. 177 Pension Fund’s Form 5500 as providing more than five percent of total contributions for the year ended December 31, 2016. The Company was not listed in any of the other plans’ Forms 5500 as providing more than five percent of the total contributions for the plans and plan years. At the date the financial statements were issued, Forms 5500 were not available for the plan years ended December 31, 2017.

We have no current intention of withdrawing from any plan and, therefore, no liability has been provided in the accompanying consolidated financial statements.

Amounts charged to pension expense under the above plans including the multi-employer plans totaled $2.0 million, $2.1 million and $1.3 million in 2017, 2016 and 2015, respectively.

We have a profit sharing and 401(k) savings retirement plan for employees of certain of our subsidiaries. The plan covers substantially all employees who have 30 days of service, and who have attained 18 years of age. The plan allows us to make discretionary contributions and provides for employee salary deferrals of up to 100%. We made aggregate matching contributions and discretionary contributions of $1.6 million, $1.5 million, and $1.2 million during 2017, 2016 and 2015, respectively.

As a result of the PMFG acquisition, the Company acquired a defined contribution pension plan under Section 401(k) of the Internal Revenue Code for eligible employees who have completed at least 90 days of service (“PMFG Plan”). Company contributions are voluntary and at the discretion of the board of directors. For the year ended December 31, 2015, matching contributions of $0.1 million were made by the Company after the acquisition. The PMFG Plan was merged with the CECO 401(k) savings retirement plan in January 2016. The contributions made to these participants for the years ended December 31, 2017 and December 31, 2016 were included in the profit-sharing and 401(k) savings retirement plan contributions noted above.

Leases

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Leases

12.

Leases

Sale-leaseback Transactions

Denton Facility

On June 2, 2016, the Company entered into an agreement to sell its manufacturing facility in Denton, Texas for gross proceeds of $5.0 million, less costs associated with the transaction of $0.3 million, or net proceeds of $4.7 million. As a part of the transaction, the Company entered into a lease for the property from the purchaser for an initial period of 13 years.

Prior to the consummation of the above transaction, the Company entered into a sublease agreement with a supplier of the Company at this facility for a period of five years. Due to the Company’s continuing involvement through the sublease agreement, the Company has accounted for the sale-leaseback as a financing liability. Payments made by the Company are allocated between interest expense and a reduction to the sale-leaseback financing liability. The weighted-average effective interest rate of the initial sale-leaseback financing liability is 2.22%.

In June 2017, the Company amended the lease agreement. The amendment extended the lease through June of 2031 and changed the effective weighted average interest rate from the 2.22% to the 4.53%.

As of December 31, 2017, future payments on the sale-leaseback financing liability are as follows (in thousands):

Fiscal Years	Payments
2018		406
2019		414
2020		422
2021		431
2022		439
Thereafter		4,106
Total payments		6,218
Less amount representing interest		(1,635	)
Total sale-leaseback financing liability		4,583
Less current portion of sale-leaseback financing liability included in accounts payable and accrued expenses		(202	)
Long-term portion of sale-leaseback financing liability included in other liabilities	$	4,381

As of December 31, 2017 and 2016, the net carrying value of the Denton facility assets that are included in property, plant, and equipment on our Consolidated Balance Sheets amounted to $11.0 million and $12.3 million, respectively. The useful life of these assets was modified to the remainder of the lease’s duration.

Telford Facility

On June 2, 2016, the Company entered into an agreement to sell its manufacturing facility in Telford, Pennsylvania for gross proceeds of $6.0 million, less costs associated with the transaction of $0.4 million, or net proceeds of $5.6 million. As a part of the transaction, the Company entered into a lease for the property from the purchaser for a period of 13 years.

The Company recorded a deferred gain on the sale of this facility in the amount of $2.4 million recorded in the Consolidated Balance Sheets as an offset to property, plant, and equipment, which will be recognized over the 13-year lease term. As a result of this transaction, the Company initially recorded a capital lease obligation of $5.7 million for the facilities leased. The weighted-average effective interest rate of the capital lease was 3.43%.

Indianapolis Facility

On August 16, 2016, the Company entered into an agreement to sell its manufacturing facility in Indianapolis, Indiana for gross proceeds of $3.3 million, less costs associated with the transaction of $0.1 million, or net proceeds of $3.2 million. As a part of the transaction, the Company entered into a lease for the property from the purchaser for a period of 13 years.

The Company recorded a deferred gain on the sale of this facility in the amount of $2.0 million recorded in the Consolidated Balance Sheets as an offset to property, plant, and equipment, which will be recognized over the 13-year lease term. As a result of this transaction, the Company initially recorded a capital lease obligation of $3.0 million for the facilities leased. The weighted-average effective interest rate of the capital lease was 3.25%.

The future minimum payments for the Indianapolis and Telford capital leases that the Company entered into as of December 31, 2017, are as follows (in thousands):

Fiscal Years	Payments
2018	$	759
2019		774
2020		790
2021		805
2022		821
Thereafter		5,756
Total payments		9,705
Less amount representing interest		(1,705	)
Present value of future minimum lease payments		8,000
Less current portion of capital lease obligation included in accounts payable and accrued expenses		(501	)
Long-term portion of capital lease obligation included in other liabilities	$	7,499

Prior to the execution of these transactions, the Company did not have any assets held under capital leases. Capital lease assets included in the Consolidated Balance Sheets as part of property, plant, and equipment as of December 31, 2017, are as follows (in thousands):

	December 31, 2017			December 31, 2016			Depreciable Life (Years)

Building and improvements, net of deferred gain	$	4,385		$	4,385			13
Less: Accumulated depreciation		(534	)		(197	)
Total	$	3,851		$	4,188

Rent

We lease certain facilities on a year-to-year basis. We also have future annual minimum rental commitments under noncancelable operating leases as follows:

(Table only in thousands) December 31,	Commitment
2018	$	4,470
2019		3,197
2020		2,477
2021		2,228
2022		1,764
2023 and thereafter		3,128
	$	17,264

Total rent expense under all operating leases for 2017, 2016 and 2015 was $4.2 million, $4.5 million and $4.0 million, respectively.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13.	Commitments and Contingencies

Legal Proceedings

Asbestos cases

Our subsidiary, Met-Pro, beginning in 2002 began to be named in asbestos-related lawsuits filed against a large number of industrial companies including, in particular, those in the pump and fluid handling industries. In management’s opinion, the complaints typically have been vague, general and speculative, alleging that Met-Pro, along with the numerous other defendants, sold unidentified asbestos-containing products and engaged in other related actions which caused injuries (including death) and loss to the plaintiffs. Counsel has advised that more recent cases typically allege more serious claims of mesothelioma. The Company’s insurers have hired attorneys who, together with the Company, are vigorously defending these cases. Many cases have been dismissed after the plaintiff fails to produce evidence of exposure to Met-Pro’s products. In those cases, where evidence has been produced, the Company’s experience has been that the exposure levels are low and the Company’s position has been that its products were not a cause of death, injury or loss. The Company has been dismissed from or settled a large number of these cases. Cumulative settlement payments from 2002 through December 31, 2017 for cases involving asbestos-related claims were $1.3 million which together with all legal fees other than corporate counsel expenses; $1.2 million have been paid by the Company’s insurers. The average cost per settled claim, excluding legal fees, was approximately $28,000.

Based upon the most recent information available to the Company regarding such claims, there were a total of 218 cases pending against the Company as of December 31, 2017 (with Connecticut, New York, Pennsylvania and West Virginia having the largest number of cases), as compared with 229 cases that were pending as of December 31, 2016. During 2017, 51 new cases were filed against the Company, and the Company was dismissed from 56 cases and settled six cases. Most of the pending cases have not advanced beyond the early stages of discovery, although a number of cases are on schedules leading to, or are scheduled for trial. The Company believes that its insurance coverage is adequate for the cases currently pending against the Company and for the foreseeable future, assuming a continuation of the current volume, nature of cases and settlement amounts. However, the Company has no control over the number and nature of cases that are filed against it, nor as to the financial health of its insurers or their position as to coverage. The Company also presently believes that none of the pending cases will have a material adverse impact upon the Company’s results of operations, liquidity or financial condition.

Valero

One of our subsidiaries, Fisher-Klosterman, Inc. (“FKI”), was a defendant in a products liability lawsuit filed in Harris County, Texas on August 23, 2010 by three Valero refining companies (“Valero Suit”). The plaintiffs claimed that FKI (and its co-Defendants) used an allegedly defective refractory material included in cyclones it supplied to Valero that caused damages to refineries they own and operate. Plaintiffs claimed to have suffered property damages, including catalyst loss, regenerator repair costs, replacement part costs, damage to other property and business interruption loss. During 2014, the Company reached a settlement with the plaintiffs for $0.5 million and, accordingly, recorded a corresponding charge to operations. In addition, the Company reached an agreement with a supplier to recover $0.2 million related to this matter. The recovery was also recorded during 2014. The Company’s insurer, Valley Forge Insurance Company (“Valley Forge”) who had paid for the legal defense in this matter, initiated a new case in the Southern District of Ohio against the Company in October 2014 seeking, among other things, recoupment of past legal costs paid (“Coverage Suit”). Valley Forge claimed that it did not have an obligation to defend FKI and was entitled to recoup all amounts paid to defend FKI. The Court rejected Valley Forge’s position on the duty to defend as contrary to Ohio law. The Court found that if Valley Forge could prove that FKI breached its duty to cooperate in defending the Valero Suit, Valley Forge may be relieved of its duty to defend to some extent. Valley Forge moved for reconsideration of the Court’s opinion in May 2016, which the court ruled against. The Court ruled in 2017 that Valley Forge could amend its complaint. The Company and Valley Forge executed an agreement in December of 2017 to settle the matter for a nominal amount. As a result of this settlement, Valley Forge and FKI agreed to dismiss their claims against one another.

Viron

On October 3, 2014, Viron International (“Viron”) filed a complaint against us and our subsidiary, the Kirk and Blum Manufacturing Company (“Kirk & Blum”), in the United States District Court for the Western District of Texas (the “Court”) seeking damages against us for alleged breach of contract. After a trial in 2015, the Court issued Findings of Fact and Conclusions of Law that provide that we breached our contract with Viron and that Viron is entitled to damages in the amount of approximately $0.6 million plus attorneys’ fees. Additionally, the Court concluded that we are not entitled to an offset for the invoiced amounts of $0.2 million not paid by Viron under the contract. In 2015, we settled with Viron for $0.5 million, $0.3 million was previously accrued in 2014, and the remaining $0.2 million was recorded as expense and paid in 2015.

Summary

The Company is also a party to routine contract and employment-related litigation matters and routine audits of state and local tax returns arising in the ordinary course of its business.

The final outcome and impact of open matters, and related claims and investigations that may be brought in the future, are subject to many variables, and cannot be predicted. In accordance with ASC 450, “Contingencies,” and related guidance, we record reserves for estimated losses relating to claims and lawsuits when available information indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. The Company expenses legal costs as they are incurred.

We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, results of operations, or cash flows.

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

14.	Income Taxes

On December 22, 2017, the Tax Act was signed into law making significant changes to the U.S. tax code. Changes affecting the Company’s consolidated 2017 financial statements include, but are not limited to, a U.S. federal corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017 and a one-time transition tax, payable over eight years, on the mandatory deemed repatriation of cumulative foreign earnings as of December 31, 2017.

On December 22, 2017, the SEC staff issued SAB 118, which provides guidance on accounting for the tax effects of the Tax Act when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Act. In accordance with SAB 118, the Company has recognized provisional amounts related to the tax effects of the Tax Act for which the Company was able to make reasonable estimates. For the provisions of the Tax Act for which the Company was unable to determine a provisional amount, the Company has continued to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. Tax effects of the Tax Act will be recognized or adjusted as additional implementation guidance is released and analyses are finalized, but no later than the end of the measurement period prescribed by SAB 118, which is one year from the enactment date of the Tax Act.

The provisional amount recorded related to the remeasurement of certain deferred tax assets and liabilities, based on the rates at which they are expected to reverse in the future, was a net benefit of $4.8 million. The provisional amount recorded related to the one-time transition tax on the mandatory deemed repatriation of foreign earnings was a charge of $6.4 million. The Company has not historically claimed significant Foreign Tax Credits. An estimate of potential Foreign Tax Credits available to offset the one-time transition tax has not been made and no provisional amount is provided.

The Company has not historically recorded deferred income taxes on the undistributed earnings of its foreign subsidiaries because of management’s intent to indefinitely reinvest such earnings. As of December 31, 2017, Management has not changed its intent to indefinitely reinvest such earnings, but the Tax Act could cause management to reevaluate this position in the future. The Tax Act subjected all previously untaxed earnings and profits of our controlled foreign corporations to a one-time mandatory repatriation tax. Future distributions of these earnings in the form of dividends or otherwise would no longer be subject to U.S. income taxes. State taxes, as well as foreign withholding taxes, could apply to distributions of earnings from foreign jurisdictions. Since the foreign earnings remain permanently reinvested in the Company’s foreign operations, no liability has been established for potential withholding taxes or other costs that would be incurred if the earnings were repatriated. As of December 31, 2017, aggregate undistributed earnings of foreign subsidiaries totaled approximately $15.4M. The unrecognized deferred income tax liability on this temporary difference is estimated to be approximately $1.0 million.

Income (loss) before income taxes was generated in the United States and globally as follows:

(Table only in thousands)	2017			2016			2015
Domestic	$	3,891		$	(39,623	)	$	997
Foreign		(2,482	)		6,659			(4,093	)
	$	1,409		$	(32,964	)	$	(3,096	)

Income tax provision consisted of the following for the years ended December 31:

(Table only in thousands)	2017			2016			2015
Current:
Federal	$	6,234		$	4,957		$	3,429
State		388			892			753
Foreign		939			3,191			1,944
		7,561			9,040			6,126
Deferred:
Federal		(2,479	)		(2,794	)		(3,012	)
State		114			(409	)		(563	)
Foreign		(758	)		(547	)		87
		(3,123	)		(3,750	)		(3,488	)
	$	4,438		$	5,290		$	2,638

The income tax provision differs from the statutory rate due to the following:

(Table only in thousands)	2017			2016			2015
Tax expense (benefit) at statutory rate	$	494		$	(11,525	)	$	(1,083	)
Increase (decrease) in tax resulting from:
State income tax, net of federal benefit		367			174			34
Domestic production activities deduction		(235	)		(561	)		(211	)
Intangible asset and goodwill impairment		1,789			17,859			—
Change in uncertain tax position reserves		465			(624	)		(1,281	)
Permanent differences		1,026			(31	)		1,162
Impact of rate differences and adjustments		(20	)		(1,655	)		(1,489	)
United States and foreign tax incentives		(240	)		(1,035	)		(883	)
Non-deductible transaction costs		—			7			1,356
Earnout (income) expense		(1,779	)		2,573			3,928
Change in valuation allowance		1,044			222			483
Audit settlements		—			—			65
Provision-to-return adjustments		(495	)		108			808
Revaluation of deferred tax assets and liabilities		(4,819	)		—			—
Net deemed dividend on repatriation of foreign earnings		6,426			—			—
Other		415			(222	)		(251	)
	$	4,438		$	5,290		$	2,638

Deferred income taxes reflect the future tax consequences of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes and tax credit carry forwards. As a result of the Tax Act, net deferred tax liabilities were remeasured as of December 31, 2017 based on a reasonable estimate of the effect of the change in the federal tax rate. The net deferred tax liabilities consisted of the following at December 31:

(Table only in thousands)	2017			2016
Gross deferred tax assets:
Accrued expenses and other	$	286		$	3
Reserves on assets		2,000			3,078
Share-based compensation awards		436			1,340
Minimum pension / post retirement		2,318			4,197
Net operating loss carry-forwards		3,471			5,932
Tax credit carry-forwards		1,634			1,634
Valuation allowances		(3,873	)		(3,135	)
		6,272			13,049
Gross deferred tax liabilities:
Depreciation		(448	)		(614	)
Goodwill and intangibles		(13,588	)		(23,060	)
Prepaid expenses and inventory		(585	)		(785	)
Revenue recognition		(1,861	)		(1,554	)
		(16,482	)		(26,013	)
Net deferred tax liabilities	$	(10,210	)	$	(12,964	)

As of December 31, 2017, the Company has federal net operating loss carry forwards of $4.9 million, and state and local net operating loss carry forwards of $23.4 million, which expire from 2018 to 2037. The Company has recorded a valuation allowance on certain of these net operating loss carry forwards to reflect expected realization. The Company also has net operating loss carry forwards in international jurisdictions totaling $8.8 million. A full valuation allowance has been established against substantially all of these losses in international jurisdictions. As of December 31, 2017 and 2016, the Company has recorded a valuation reserve in the amount of $3.9 million and $3.1 million, respectively. The changes in the valuation allowance resulted in additional income tax expense of $1.0 million, $0.2 million, and $0.6 million in 2017, 2016, and 2015, respectively.

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities (including the impact of available carryback and carry forward periods), projected future taxable income, and tax-planning strategies in making this assessment. Based on this assessment, management believes it is more likely than not that the Company will realize the benefits of these deductible differences, net of the existing valuation allowances at December 31, 2017. The amount of the deferred tax assets considered realizable, however, could be reduced in the near term if estimates of future taxable income during the carryforward period are reduced.

The Company accounts for uncertain tax positions pursuant to FASB ASC Topic 740. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company estimates that it may settle one or more foreign and domestic audits in the next twelve months that may result in a decrease in the amount of accrual for uncertain tax positions of up to $0.5 million. A reconciliation of the beginning and ending amount of uncertain tax position reserves included in other liabilities on the Consolidated Balance Sheets is as follows:

(Table only in thousands)	2017		2016
Balance as of January 1,	$	401	$	1,024
Additions for tax positions taken in prior years		465		—
Statute expirations		—		(576	)
Reductions of tax positions taken in prior years		—		(47	)
Balance as of December 31,	$	866	$	401

The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. During 2017, 2016, and 2015, there was no such expense for interest and penalties. The favorable settlement of all uncertain tax positions would impact the Company’s effective income tax rate. Tax years going back to 2014 remain open for examination by Federal authorities, and back to 2012 remain open for all significant state and foreign authorities.

Related Party Transactions

12 Months Ended

Dec. 31, 2017

Related Party Transactions

15.	Related Party Transactions

During 2017, 2016 and 2015 we paid fees of $0.3 million, $0.4 million and $0.4 million, respectively, for consulting services to Icarus, through which Jason DeZwirek, our Chairman of our Board, provides services. During 2017, 2016 and 2015, we paid fees of $0.1 million, $0.1 million and $0.3 million, respectively, for consulting services to JMP Fam Holdings Inc., through which Jonathan Pollack, a member of the Board of Directors, provides services. All services described above are based on verbal agreements with the Company. The Board of Directors approves the above services on an annual basis.

During the year ended December 31, 2016, the Company issued 89,640 shares of common stock to Icarus in connection with a cashless exercise of a warrant. In 2016, the Company entered into an agreement to repurchase 75,000 shares of common stock from a current employee. See Note 10 for further detail related to these transactions.

During 2017, 2016, and 2015, we incurred rent expense of $0.6 million, $1.1 million, and $1.1 million, respectively, to lease facilities owned by the subsidiaries’ former owners at Adwest, Zhongli and Emtrol. Effective January 1, 2017 Adwest moved facilities and ended their lease with the former owner of the subsidiary, resulting in zero rent expense paid to the former owner.

During 2017, 2016, and 2015, we purchased $0.8 million, $0.8 million and $0.3 million in inventory from companies owned by the former owner of the Zhongli subsidiary. During 2017, 2016, and 2015, we sold $0.1 million, zero and $0.4 million of inventory to the same companies. The Company employed the former owner in a managerial role at this subsidiary through December 31, 2017.

Major Customers and Foreign Sales

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Major Customers and Foreign Sales

16.	Major Customers and Foreign Sales

No single customer represented greater than 10% of consolidated net sales or accounts receivable for 2017, 2016, or 2015.

For 2017, 2016, and 2015, sales to customers outside the United States, including export sales, accounted for approximately 32%, 37%, and 38%, respectively, of consolidated net sales. The largest portion of export sales in 2017 was destined for Asia (12% of the total sales) and Europe (6% of total sales). Of consolidated long lived assets, $35.4 million and $34.8 million were located outside of the United States as of December 31, 2017 and 2016, respectively. The largest portion of long-lived assets located outside the United States at December 31, 2017 were in Europe ($19.6 million of the total long-lived assets), and Asia, ($13.6 million of the total long-lived assets).

Acquisitions

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Acquisitions

17.	Acquisitions

PMFG

On September 3, 2015, the Company completed its acquisition of 100% of PMFG’s outstanding common stock for a purchase price of $136.7 million. PMFG’s shareholders had the option to elect to exchange each share of PMFG common stock for either (i) $6.85 in cash, without interest, or (ii) shares of the Company’s common stock valued at $6.85, based on the volume weighted average trading price of the Company’s common stock for the 15-trading day period ending on September 2, 2015, the last trading day before the closing of the acquisition, subject to a collar so that there was a maximum exchange ratio of 0.6456 shares of the Company’s common stock for each share of PMFG common stock and a minimum exchange ratio of 0.5282 shares of the Company’s common stock for each share of PMFG common stock, subject to certain exceptions and with overall elections subject to proration.

Approximately 44.5% of the shares of PMFG common stock converted into the right to receive the $6.85 cash consideration, for an approximate total of $64.6 million. The Company’s common stock trading price for the 15 day period was $9.6655. As a result, each of the remaining shares of PMFG common stock converted into the right to receive 0.6456 shares of Company common stock, or an approximate total of 7,602,166 shares of Company common stock in aggregate.

In accordance with the proration and reallocation provisions of the merger agreement, because the $6.85 per share cash consideration was oversubscribed by PMFG shareholders prior to the election deadline, (a) each PMFG share for which a valid stock election was made or for which no valid cash or stock election was made was automatically cancelled and converted into the right to receive the stock consideration and (b) each PMFG shareholder of record that made a valid cash election by the deadline received (i) the cash consideration for approximately 58.05% of such holder’s PMFG shares for which a valid cash election was made and (ii) the stock consideration for approximately 41.95% of such holder’s PMFG Shares for which a valid cash election was made. The value of stock recorded for purchase accounting was $72.1 million, which equates to approximately $9.49 per share.

PMFG is a global provider of engineered equipment for the abatement of air pollution, the separation and filtration of containments from gases and liquids, and industrial noise control equipment, which complements our Energy segment businesses.

As a result of the PMFG acquisition, the Company acquired a 60% equity investment in Peerless Propulsys that entitled the Company to 80% of Peerless Propulsys’s earnings. In prior periods, the noncontrolling interest of Peerless Propulsys was reported as a separate component on the Consolidated Balance Sheets. During 2016, the Company entered into an agreement with the noncontrolling owner of Peerless Propulsys and issued a promissory note in the amount of $5.3 million due on July 11, 2019 in exchange for 100% ownership in the equity and earnings of Peerless Propulsys. The minority interest had a carrying value of $4.1 million on July 11, 2016, compared to the purchase price of $5.3 million. Since the Company already had control over the equity investment, the excess paid of $1.2 million was recorded as a debit to additional paid in capital. The interest rate on the note payable is 1.50%, which approximates the market rate given the short term duration of the note payable. All of the borrowers’ assets are pledged to secure this agreement. As of December 31, 2017, $5.3 million of the note payable was outstanding and is payable at the earlier of July 11, 2019 or thirty days subsequent to the sale of building and land that the Company owns in China. The note payable is currently classified as a current liability in the Consolidated Balance Sheets as of December 31, 2017. In conjunction with entering into the agreement to acquire the noncontrolling interest of Peerless Propulsys, the Company listed the land and building as assets held for sale with a carrying value of $5.4 million in the Consolidated Balance Sheets as of December 31, 2017.

The following table summarizes the fair values of the assets acquired and liabilities assumed at the date of closing after the Company finalized purchase accounting during 2016.

(Table only in thousands)
Current assets (including cash of $27,100)	$	92,293
Property and equipment		24,787
Other assets		953
Assets held for sale (a)		950
Deferred income tax asset		—
Goodwill		59,860
Intangible – finite life		29,940
Intangible – indefinite life		10,280
Total assets acquired		219,063
Current liabilities assumed		(73,364	)
Deferred income tax liability		(800	)
Long term liabilities assumed		(3,961	)
Noncontrolling interest		(4,212	)
Net assets acquired	$	136,726

(a)	The assets held for sale consists primarily of real property, and are valued at the estimated proceeds less cost to sell. The Company has not recorded a gain or loss on the classification of the subject assets to held for sale.

During 2017, 2016, and 2015, PMFG accounted for $89.4 million, $101.7 million, and $40.8 million of revenue, respectively, and $6.7, $13.1 million, and $2.2 million of pre-tax income, respectively, included in the Company’s results.

Goodwill related to the PMFG acquisition is not deductible for tax purposes.

The following unaudited pro forma information represents the Company’s results of operations as if PMFG acquisition had occurred as of January 1, 2014:

(Table only in thousands, except per share data)	Year Ended December 31, 2015
Net sales	$	460,726
Net loss		(29,568	)
Earnings per share:
Basic		(0.87	)
Diluted		(0.87	)

The pro forma results have been prepared for informational purposes only and include adjustments to amortize acquired intangible assets with finite life, reflect foregone interest income on cash paid for the acquisitions, reflect additional interest expense on debt used to fund the acquisitions, and to record the income tax consequences of the pro forma adjustments. Included in the pro forma results are acquisition related expenses of $17.7 million, and certain nonrecurring expenses, such as goodwill impairment, of $3.7 million, for the year ended December 31, 2015. Shares used to calculate the basic and diluted earnings per share were adjusted to reflect the additional shares of common stock issued to fund a portion of the acquisition price. These pro forma results do not purport to be indicative of the results of operations that would have occurred had the purchases been made as of the beginning of the periods presented or of the results of operations that may occur in the future.

Goodwill recognized on the PMFG acquisition represents value the Company expects to be created by combining the operations of the acquired business with the Company’s operations, including the expansion into markets within existing business segments, access to new customers and potential cost savings and synergies. See Note 7 for further discussion related to the Company’s goodwill.

Acquisition and integration expenses on the Consolidated Statements of Operations are related to acquisition activities, which include retention, legal, accounting, banking, and other expenses.

Business Segment Information

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Business Segment Information

18.	Business Segment Information

The Company’s operations are organized and reviewed by management along its product lines or end market that the segment serves and are presented in three reportable segments. The results of the segments are reviewed through to the “Income (loss) from operations” line on the Consolidated Statements of Operations. The accounting policies of the segments are the same as those in the consolidated financial statements. Except for the information reported on a segment basis, the Company does not accumulate net sales information by product or service and therefore, the Company does not disclose net sales by product or service because to do so would be impractical. The Company’s reportable segments are however organized as groups of similar products and services, defined as follows:

Energy Segment

Our Energy segment provides customized solutions for the power and petrochemical industry. This includes gas turbine exhaust systems, dampers and diverters, gas and liquid separation and filtration equipment, selective catalytic reduction (“SCR”) and selective non-catalytic reduction (“SNCR”) systems, acoustical components and silencers, secondary separators (nuclear plant reactor vessels) and expansion joints, the design and manufacture of technologies for flue gas and diverter dampers, non-metallic expansion joints, natural gas turbine exhaust systems, and silencer and precipitator applications, primarily for coal-fired and natural gas power plants, refining, oil production and petrochemical processing, as well as a variety of other industries.

Environmental Segment

Our Environmental segment provides the design and manufacture of product recovery and air pollution control technologies that enable our customers to meet compliance targets for toxic emissions, fumes, volatile organic compounds, process and industrial odors. These products and solutions include high efficiency and fluid catalytic cracking cyclone systems, scrubbers, regenerative thermal and catalytic oxidizers, dust collectors and baghouses, standard and engineered industrial ducting, fabric filters and cartridge collectors, ventilation and exhaust systems for emissions and contaminants, and process cooling systems for steel in rolling mills. This segment also provides component parts for industrial air systems and provides cost effective alternatives to traditional duct components, as well as custom metal engineered fabrication services. These products and services are applicable to a wide variety of industries.

Fluid Handling and Filtration Segment

Our Fluid Handling and Filtration segment provides the design and manufacture of high quality pump, filtration and fume exhaust solutions. This includes centrifugal pumps for corrosive, abrasive and high temperature liquids, filter products for air and liquid filtration, precious metal recovery systems, carbonate precipitators, and technologically advanced air movement and exhaust systems. These products are applicable to a wide variety of industries, particularly the aquarium/aquaculture, plating and metal finishing, food and beverage, chemical/petrochemical, wastewater treatment, desalination and pharmaceutical markets.

	2017			2016			2015
Net Sales (less intra-, inter-segment sales)
(Table only in thousands)
Energy Segment	$	149,514		$	203,376		$	142,150
Environmental Segment		127,279			153,344			158,371
Fluid Handling and Filtration Segment		69,159			61,783			67,610
Corporate and Other (1)		(901	)		(1,492	)		(709	)
Net sales	$	345,051		$	417,011		$	367,422

(1)	Includes adjustment for revenue on intercompany jobs.

	2017			2016			2015
Income (loss) from Operations
(Table only in thousands)
Energy Segment	$	8,987		$	23,575		$	3,488
Environmental Segment		13,703			15,652			17,021
Fluid Handling and Filtration Segment		14,734			(36,209	)		11,741
Corporate and Other (2)		(26,649	)		(26,981	)		(26,592	)
Eliminations		(2,751	)		(1,599	)		(709	)
Income (loss) from operations	$	8,024		$	(25,562	)	$	4,949

(2)	Includes corporate compensation, professional services, information technology, acquisition and integration expenses, and other general and administrative corporate expenses.

	2017		2016		2015
Property and Equipment Additions
(Table only in thousands)
Energy Segment	$	438	$	569	$	429
Environmental Segment		166		404		166
Fluid Handling and Filtration Segment (3)		382		4,481		150
Corporate and Other		42		7		18
Property and equipment additions	$	1,028	$	5,461	$	763

(3)Includes non-cash additions of $4,385 for property, plant, and equipment acquired under capital leases for the year ended December 31, 2016. See Note 12 for further detail.

	2017		2016		2015
Depreciation and Amortization
(Table only in thousands)
Energy Segment	$	7,866	$	9,555	$	5,293
Environmental Segment		3,297		3,816		4,443
Fluid Handling and Filtration Segment		4,754		5,406		6,331
Corporate and Other		171		126		453
Depreciation and amortization	$	16,088	$	18,903	$	16,520

	December 31,
	2017		2016
Identifiable Assets
(Table only in thousands)
Energy Segment	$	217,033	$	257,566
Environmental Segment		107,910		118,680
Fluid Handling and Filtration Segment		100,916		104,294
Corporate and Other (4)		12,690		18,094
Identifiable assets	$	438,549	$	498,634

(4)	Corporate assets primarily consist of cash and income tax related assets.

	December 31,
	2017		2016
Goodwill
(Table only in thousands)
Energy Segment	$	72,625	$	75,827
Environmental Segment		48,203		48,203
Fluid Handling and Filtration Segment		46,123		46,123
Goodwill	$	166,951	$	170,153

Intra-segment and Inter-segment Revenues

The Company has multiple divisions that sell to each other within segments (intra-segment sales) and between segments (inter-segment sales) as indicated in the following tables:

	Year Ended December 31, 2017
						Less Inter-Segment Sales
	Total Sales		Intra - Segment Sales			Environmental			Energy			FHF			Corp and Other			Net Sales to Outside Customers
Net Sales
(Table only in thousands)
Energy Segment	$	158,456	$	(8,834	)	$	(108	)	$	—		$	—		$	—		$	149,514
Environmental Segment		131,356		(3,235	)		—			(787	)		(55	)		—			127,279
Fluid Handling and Filtration Segment		73,652		(3,169	)		(493	)		(832	)		—			—			69,159
Corporate and Other (5)		—		—			—			—			—			(901	)		(901	)
Net Sales	$	363,464	$	(15,238	)	$	(601	)	$	(1,619	)	$	(55	)	$	(901	)	$	345,051

	Year Ended December 31, 2016
						Less Inter-Segment Sales
	Total Sales		Intra - Segment Sales			Environmental			Energy			FHF			Corp and Other			Net Sales to Outside Customers
Net Sales
(Table only in thousands)
Energy Segment	$	207,280	$	(3,506	)	$	(398	)	$	—		$	—		$	—		$	203,376
Environmental Segment		160,959		(4,256	)		—			(3,153	)		(206	)		—			153,344
Fluid Handling and Filtration Segment		64,327		(1,714	)		(317	)		(513	)		—			—			61,783
Corporate and Other (5)		—		—			—			—			—			(1,492	)		(1,492	)
Net Sales	$	432,566	$	(9,476	)	$	(715	)	$	(3,666	)	$	(206	)	$	(1,492	)	$	417,011

	Year Ended December 31, 2015
						Less Inter-Segment Sales
	Total Sales		Intra - Segment Sales			Environmental			Energy			FHF			Corp and Other			Net Sales to Outside Customers
Net Sales
(Table only in thousands)
Energy Segment	$	147,661	$	(4,876	)	$	(635	)	$	—		$	—		$	—		$	142,150
Environmental Segment		167,247		(6,744	)		—			(1,937	)		(195	)		—			158,371
Fluid Handling and Filtration Segment		70,084		(2,277	)		(197	)		—			—			—			67,610
Corporate and Other (5)		—		—			—			—			—			(709	)		(709	)
Net Sales	$	384,992	$	(13,897	)	$	(832	)	$	(1,937	)	$	(195	)	$	(709	)	$	367,422

(5)	Includes adjustment for revenue on intercompany jobs.

Quarterly Data (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Data (Unaudited)

19.	Quarterly Data (Unaudited)

Earnings per share amounts are computed independently each quarter. Accordingly, the sum of each quarter’s per share amount may not equal the total per share amount for the respective year.

	Quarter
(Table only in thousands, except per share data)	First		Second		Third		Fourth
Year ended December 31, 2017
Net sales	$	92,651	$	93,870	$	84,987	$	73,543
Gross profit		31,929		28,486		27,133		25,646
Net income (loss)		38		5,486		3,036		(11,589	)
Net income (loss) attributable to CECO Environmental Corp.		38		5,486		3,036		(11,589	)
Basic earnings (loss) per share	$	0.00	$	0.16	$	0.09	$	(0.34	)
Diluted earnings (loss) per share	$	0.00	$	0.16	$	0.09	$	(0.34	)

Year ended December 31, 2016
Net sales	$	103,175	$	112,258	$	101,596	$	99,982
Gross profit		31,586		33,930		33,676		35,667
Net income (loss)		3,055		4,037		5,826		(51,172	)
Net income (loss) attributable to CECO Environmental Corp.		3,100		4,050		5,804		(51,172	)
Basic earnings (loss) per share	$	0.09	$	0.12	$	0.17	$	(1.49	)
Diluted earnings (loss) per share	$	0.09	$	0.12	$	0.17	$	(1.49	)

Nature of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Nature of business

Principles of consolidation

Principles of consolidation—Our consolidated financial statements include the accounts of the following subsidiaries:

	% Owned As Of December 31, 2017
CECO Group, Inc.		100	%
CECO Group Global Holdings LLC		100	%
CECO Filters, Inc. and Subsidiaries (“CFI”)		99	%
The Kirk & Blum Manufacturing Company		100	%
CECO Air Quality Solutions, Inc.		100	%
EFFOX, Inc. (“Effox”)		100	%
Fisher-Klosterman, Inc. (“FKI”)		100	%
Flextor, Inc. (“Flextor”)		100	%
Adwest Technologies, Inc. (“Adwest”)		100	%
Aarding Thermal Acoustics B.V. (“Aarding”)		100	%
Met-Pro Technologies LLC (“Met-Pro”)		100	%
Peerless Mfg. Co. (“PMFG”)		100	%

CFI includes one wholly owned subsidiary, CECO Environmental India Private Limited (f/k/a. CECO Filter India Private Limited). The noncontrolling interest in CFI is not material.

FKI includes three wholly owned subsidiaries, AVC, Inc. (“AVC.”), Emtrol LLC (“Emtrol”) and SAT Technology, Inc. (“SAT”).

CECO Group, Inc. has two wholly owned subsidiaries in Mexico, CECO Environmental Mexico S de RL de CV and CECO Environmental Services Mexico S de RL de CV.

Unless indicated, all balances within tables are in thousands except per share amounts. All intercompany balances and transactions have been eliminated.

Property, plant and equipment

Selling and administrative expenses

Acquisition and integration expenses

Amortization and earnout expenses

Restructuring expenses

Indirect Taxes

Indirect Taxes—The Company records taxes collected from customers and remitted to governmental authorities on a net basis in the Consolidated Statements of Operations.

Product Warranties

Advertising costs

Advertising costs—Advertising costs are charged to operations in the year incurred and totaled $0.9 million, $0.9 million and $1.0 million in 2017, 2016 and 2015, respectively.

Research and Development

Income taxes

Earnings per share

Earnings per share—The computational components of basic and diluted earnings per share for 2017, 2016 and 2015 are below.

	For the Year Ended December 31, 2017
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(3,029	)		34,445	$	(0.09	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(3,029	)		34,445	$	(0.09	)

	For the Year Ended December 31, 2016
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(38,218	)		33,980	$	(1.12	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(38,218	)		33,980	$	(1.12	)

	For the Year Ended December 31, 2015
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(5,602	)		28,792	$	(0.19	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(5,602	)		28,792	$	(0.19	)

Once a restricted stock award vests, it is included in the computation of weighted average shares outstanding for purposes of basic and diluted earnings per share.

Foreign Currency Translation

New Financial Accounting Pronouncements

Accounting Standards Adopted in Fiscal 2017

We have adopted ASU 2016-09 effective January 1, 2017 on a prospective basis where permitted by the new standard. As a result of this adoption:

• We excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of our diluted earnings per share for the year ended December 31, 2017.

Accounting Standards Yet to be Adopted

Nature of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Consolidated Financial Statements Include Accounts of Subsidiaries

Principles of consolidation—Our consolidated financial statements include the accounts of the following subsidiaries:

	% Owned As Of December 31, 2017
CECO Group, Inc.		100	%
CECO Group Global Holdings LLC		100	%
CECO Filters, Inc. and Subsidiaries (“CFI”)		99	%
The Kirk & Blum Manufacturing Company		100	%
CECO Air Quality Solutions, Inc.		100	%
EFFOX, Inc. (“Effox”)		100	%
Fisher-Klosterman, Inc. (“FKI”)		100	%
Flextor, Inc. (“Flextor”)		100	%
Adwest Technologies, Inc. (“Adwest”)		100	%
Aarding Thermal Acoustics B.V. (“Aarding”)		100	%
Met-Pro Technologies LLC (“Met-Pro”)		100	%
Peerless Mfg. Co. (“PMFG”)		100	%

Number of Shares Outstanding for Calculation of Earnings (Loss) Per Share

Earnings per share—The computational components of basic and diluted earnings per share for 2017, 2016 and 2015 are below.

	For the Year Ended December 31, 2017
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(3,029	)		34,445	$	(0.09	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(3,029	)		34,445	$	(0.09	)

	For the Year Ended December 31, 2016
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(38,218	)		33,980	$	(1.12	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(38,218	)		33,980	$	(1.12	)

	For the Year Ended December 31, 2015
	Numerator (Loss)			Denominator (Shares)		Per Share Amount
Basic net loss and loss per share	$	(5,602	)		28,792	$	(0.19	)
Effect of dilutive securities:
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan		—			—		—
Diluted net loss and loss per share	$	(5,602	)		28,792	$	(0.19	)

Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Summary of Accounts Receivable

(Table only in thousands)	2017			2016
Trade receivables	$	11,603		$	11,976
Contract receivables		60,543			72,835
Allowance for doubtful accounts		(4,156	)		(1,749	)
Total accounts receivable	$	67,990		$	83,062

Costs and Estimated Earnings on Uncompleted Contracts (Tables)

12 Months Ended

Dec. 31, 2017

Text Block [Abstract]

Costs and Estimated Earnings on Uncompleted Contracts

(Table only in thousands)	2017			2016
Costs incurred on uncompleted contracts	$	169,665		$	186,609
Estimated earnings		61,556			77,709
Total costs and estimated earnings on uncompleted contracts, gross		231,221			264,318
Less billings to date		(217,743	)		(261,280	)
Total costs and estimated earnings on uncompleted contracts, net	$	13,478		$	3,038
Included in the accompanying consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	$	33,947		$	38,123
Billings in excess of costs and estimated earnings on uncompleted contracts		(20,469	)		(35,085	)
Total costs and estimated earnings on uncompleted contracts, net	$	13,478		$	3,038

Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:

(Table only in thousands)	2017			2016
Raw materials	$	18,444		$	17,889
Work in process		3,182			3,986
Finished goods		940			1,508
Obsolescence allowance		(1,597	)		(1,896	)
Total inventories	$	20,969		$	21,487

Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Summary of Property, Plant and Equipment

(Table only in thousands)	2017			2016
Land	$	1,627		$	1,617
Building and improvements		18,063			19,887
Machinery and equipment		25,068			22,219
Property, plant and equipment, gross		44,758			43,723
Less accumulated depreciation		(21,358	)		(16,453	)
Property, plant and equipment, net	$	23,400		$	27,270

Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill / Tradename

(Table only in thousands)	Energy Segment			Environmental Segment			Fluid Handling and Filtration Segment			Totals
Balance of goodwill at December 31, 2015	$	72,075		$	55,031		$	93,057		$	220,163
2016 acquisition related adjustments		4,205			—			—			4,205
Impairment charge		—			(6,828	)		(46,934	)		(53,762	)
Foreign currency translation		(453	)		—			—			(453	)
Balance of goodwill at December 31, 2016		75,827			48,203			46,123			170,153
Impairment charge		(4,443	)		—			—			(4,443	)
Foreign currency translation		1,241			—			—			1,241
Balance of goodwill at December 31, 2017	$	72,625		$	48,203		$	46,123		$	166,951

	Tradenames
(Table only in thousands)	2017			2016
Beginning balance	$	22,042		$	26,337
Impairment charge		(2,725	)		(4,161	)
Foreign currency adjustments		374			(134	)
Total indefinite lived intangible assets	$	19,691		$	22,042

Summary of Finite Lived Intangible Assets

The Company’s finite lived intangible assets as of December 31, 2017 and 2016 consisted of the following:

	2017						2016
(Table only in thousands) Intangible assets – finite life	Cost			Accum. Amort.			Cost			Accum. Amort.
Technology	$	15,867		$	8,609		$	15,867		$	6,360
Customer lists		77,497			35,024			77,497			26,041
Noncompetition agreements		1,118			698			1,118			478
Tradename		1,390			440			1,390			301
Foreign currency adjustments		(1,214	)		(69	)		(2,964	)		(1,000	)
Total finite life intangible assets	$	94,658		$	44,702		$	92,908		$	32,180

Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Payables And Accruals [Abstract]

Summary of Accounts Payable and Accrued Expenses

(Table only in thousands)	2017		2016
Trade accounts payable, including amounts due to subcontractors	$	45,409	$	58,985
Compensation and related benefits		5,246		8,232
Current portion of earnout liability		2,989		13,527
Accrued warranty		4,464		2,684
Other		12,678		12,182
Total accounts payable and accrued expenses	$	70,786	$	95,610

Schedule of Current and Long term Portion of Earnout Liability

The activity in the Company’s current portion of earnout liability and long term portion of earnout liability was as follows for the twelve months ended December 31, 2017 and 2016:

(Table only in thousands)	Energy Segment			Environmental Segment		Total (1)
Earnout accrued at December 31, 2016	$	24,213		$	—	$	24,213
Fair value adjustment		(6,610	)		—		(6,610	)
Compensation expense adjustment		1,240			—		1,240
Foreign currency translation adjustment		825			—		825
Payment		(15,193	)		—		(15,193	)
Total earnout liability as of December 31, 2017	$	4,475		$	—	$	4,475
Less: current portion of earnout		(2,989	)		—		(2,989	)
Balance of long term portion of earnout recorded in other liabilities at December 31, 2017	$	1,486		$	—	$	1,486

(Table only in thousands)	Energy Segment			Environmental Segment			Total (1)
Earnout accrued at December 31, 2015	$	30,403		$	2,267		$	32,670
Fair value adjustment		6,485			(2,267	)		4,218
Compensation expense adjustment		1,213			—			1,213
Foreign currency translation adjustment		(1,346	)		—			(1,346	)
Exchange of earnout for accounts receivable		(3,272	)		—			(3,272	)
Payment		(9,270	)		—			(9,270	)
Total earnout liability as of December 31, 2016	$	24,213		$	—		$	24,213
Less: current portion of earnout		(13,527	)		—			(13,527	)
Balance of long term portion of earnout recorded in other liabilities at December 31, 2016	$	10,686		$	—		$	10,686


	(1)	The Fluid Handling and Filtration segment does not have any earnout arrangements associated with the segment.

Senior Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Summary of Debt

Debt consisted of the following at December 31, 2017 and 2016:

(Table only in thousands)	2017			2016
Outstanding borrowings under Credit Facility (defined below). Term loan payable in quarterly principal installments of $2.0 million through September 2018, $2.5 million thereafter with balance due upon maturity in September 2020.
– Term loan	$	113,903		$	125,072
– U.S. Dollar revolving loans		1,000			—
– Unamortized debt discount		(2,834	)		(3,175	)
Total outstanding borrowings under Credit Facility		112,069			121,897
Outstanding borrowings (U.S. dollar equivalent) under China Facility (defined below)		—			1,296
Outstanding borrowings (U.S. dollar equivalent) under Aarding Facility (defined below)		2,764			—
Total outstanding borrowings	$	114,833		$	123,193
Less: current portion		11,296			8,827
Total debt, less current portion	$	103,537		$	114,366

Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Dividend Declared

During 2017, 2016 and 2015, our Board declared the following quarterly cash dividends on our common stock:

Dividend Per Share	Record Date	Payment Date
$0.075	August 7, 2017	September 29, 2017
$0.075	May 10, 2017	June 30, 2017
$0.075	March 6, 2017	March 31, 2017
$0.066	December 16, 2016	December 30, 2016
$0.066	September 16, 2016	September 30, 2016
$0.066	June 18, 2016	June 30, 2016
$0.066	March 18, 2016	March 31, 2016
$0.066	December 16, 2015	December 30, 2015
$0.066	September 18, 2015	September 30, 2015
$0.066	June 12, 2015	June 26, 2015
$0.066	March 19, 2015	March 31, 2015

Summary of Stock Option

Information related to all stock options under the 2017 Plan, 2007 Plan and 1997 Plan for the years ended December 31, 2017, 2016 and 2015 is shown in the tables below:

(Shares in thousands)	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2016		1,519			10.25	6.1 years
Granted		128			9.24
Forfeitures		(700	)		12.44
Exercised		(292	)		3.92
Outstanding at December 31, 2017		655			10.53	6.0 years	$	78
Exercisable at December 31, 2017		463			10.49	5.2 years	$	78

(Shares in thousands)	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2015		1,877		$	10.30	6.8 years
Granted		105			7.36
Forfeitures		(268	)		11.91
Exercised		(195	)		6.90
Outstanding at December 31, 2016		1,519			10.25	6.1 years	$	5,816
Exercisable at December 31, 2016		959			9.23	5.3 years	$	4,608

(Shares in thousands)	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2014		1,727		$	10.12	7.3 years
Granted		286			11.55
Forfeitures		(106	)		12.31
Exercised		(30	)		4.47
Outstanding at December 31, 2015		1,877			10.30	6.8 years	$	1,769
Exercisable at December 31, 2015		977			8.48	5.4 years	$	1,765

Summary of Restricted Stock Awards

(Shares in thousands)	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2016		509		$	9.64
Granted		405			9.88
Vested		(92	)		9.78
Forfeited		(268	)		9.70
Nonvested at December 31, 2017		554			9.75

Pension and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Schedule of Changes in Projected Benefit Obligations

	Pension Benefits									Other Benefits
(Table only in thousands)	2017			2016			2015			2017			2016			2015
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	35,012		$	36,140		$	38,208			n/a			n/a			n/a
Accumulated postretirement benefit obligation		n/a			n/a			n/a			131		$	159		$	155
Service cost		415			447			233			—			—			—
Interest cost		1,314			1,426			1,412			4			4			5
Amendments		—			—			—			—			—			9
Actuarial loss/(gain)		1,787			301			(1,744	)		3			(8	)		18
Administrative expenses		(402	)		(606	)		(214	)		—			—			—
Benefits paid		(1,799	)		(2,696	)		(1,755	)		(26	)		(24	)		(28	)
Projected benefit obligation at end of year		36,327			35,012			36,140			112			131			159
Change in plan assets:
Fair value of plan assets at beginning of year		24,063			25,296			27,302			—			—			—
Actual return (loss) on plan assets		3,152			2,040			(443	)		—			—			—
Employer contribution		1,822			29			406			26			24			28
Administrative expenses		(402	)		(606	)		(214	)		—			—			—
Benefits paid		(1,799	)		(2,696	)		(1,755	)		(26	)		(24	)		(28	)
Fair value of plan assets at end of year		26,836			24,063			25,296			—			—			—
Unfunded status	$	(9,491	)	$	(10,949	)	$	(10,844	)	$	(112	)	$	(131	)	$	(159	)
Defined benefit liabilities included in accounts payable and accrued expenses	$	—		$	—		$	—		$	(24	)	$	(25	)	$	(26	)
Defined benefit liabilities included in other liabilities		(9,491	)		(10,949	)		(10,844	)		(88	)		(106	)		(133	)
Deferred tax benefit associated with accumulated other comprehensive loss		3,153			3,107			3,154			12			15			15
Accumulated other comprehensive loss, net of tax		5,154			5,074			5,144			7			9			27
Net amount recognized	$	(1,184	)	$	(2,768	)	$	(2,546	)	$	(93	)	$	(107	)	$	(117	)
Other comprehensive income (loss):
Net loss (gain)	$	358		$	90		$	708		$	3		$	(9	)	$	17
Prior service cost		—			—			—			—			—			9
Amortization of prior service cost		—			—			—			(11	)		(10	)		(9	)
Amortization of net actuarial (gain)/loss		(227	)		(212	)		(258	)		3			1			3
Total recognized in other comprehensive income (loss)	$	131		$	(122	)	$	450		$	(5	)	$	(18	)	$	20
Accumulated other comprehensive income:
Net loss (gain)	$	8,307		$	8,181		$	8,298		$	(22	)	$	(28	)	$	(20	)
Prior service cost		—			—			—			41			52			62
Amount recognized in accumulated other comprehensive income	$	8,307		$	8,181		$	8,298		$	19		$	24		$	42
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate		3.35	%		3.85	%		4.00	%		2.65	%		2.75	%		3.00	%
Compensation increase rate		n/a			n/a			n/a			n/a			n/a			n/a

Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost

The details of net periodic benefit cost for pension benefits included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2017, 2016 and 2015 are as follows:

(Table only in thousands)	2017			2016			2015
Service cost	$	415		$	447		$	233
Interest cost		1,314			1,426			1,412
Expected return on plan assets		(1,723	)		(1,829	)		(2,009	)
Net amortization and deferral		227			212			258
Net periodic benefit cost (income)	$	233		$	256		$	(106	)
Weighted-average assumptions used to determine net periodic benefit costs for the years ended December 31:
Discount rate		3.85	%		4.00	%		3.75	%
Expected return on assets		7.25	%		7.50	%		7.50	%
Compensation increase rate		n/a			n/a			n/a

Details of Defined Benefit Pension Plan Asset Allocation by Asset Category

Our defined benefit pension plan asset allocation by asset category is as follows:

	Target Allocation			Percentage of Plan Assets
	2017			2017			2016
Asset Category:
Cash and cash equivalents		0	%		4	%		4	%
Equity securities		70	%		70	%		67	%
Debt securities		30	%		26	%		29	%
Total		100	%		100	%		100	%

Disclosure of Fair Value Measurements of Pension Plan Assets

The levels assigned to the defined benefit plan assets as of December 31, 2017, are summarized in the tables below:

(Table only in thousands)	Level 1		Level 2		Level 3		Total
Pension assets, at fair value:
Cash and cash equivalents	$	1,147	$	—	$	—	$	1,147
Equity securities		18,723		—		—		18,723
Debt securities		6,967		—		—		6,967
Total assets	$	26,836	$	—	$	—	$	26,836

The levels assigned to the defined benefit plan assets as of December 31, 2016, are summarized in the tables below:

(Table only in thousands)	Level 1		Level 2		Level 3		Total
Pension assets, at fair value:
Cash and cash equivalents	$	894	$	—	$	—	$	894
Equity securities		16,153		—		—		16,153
Debt securities		7,016		—		—		7,016
Total assets	$	24,063	$	—	$	—	$	24,063

Summary of Pension Fund General Information

Pension Fund	EIN/Pension Plan Number	Pension Protection Act Zone Status	FIP/RP Status Pending/ Implemented	Surcharge Imposed	Expiration of Collective Bargaining Agreement
Sheet Metal Workers’ National Pension Fund	52-6112463/001	Yellow	FIP: Yes - Implemented RP: Yes - Implemented	No	various
Sheet Metal Workers Local 224 Pension Plan	31-6171353/001	Yellow	FIP: Yes - Implemented	No	May 31, 2018
Sheet Metal Workers Local No. 20, Indianapolis Area Pension fund	51-0168516/001	Green	Is not subject	No	May 31, 2020
Sheet Metal Workers Local No. 177 Pension Fund	62-6093256/001	Green	Is not subject	No	May 1, 2018

Leases (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Schedule of Future Payment on Sale-leaseback Financing Liability

As of December 31, 2017, future payments on the sale-leaseback financing liability are as follows (in thousands):

Fiscal Years	Payments
2018		406
2019		414
2020		422
2021		431
2022		439
Thereafter		4,106
Total payments		6,218
Less amount representing interest		(1,635	)
Total sale-leaseback financing liability		4,583
Less current portion of sale-leaseback financing liability included in accounts payable and accrued expenses		(202	)
Long-term portion of sale-leaseback financing liability included in other liabilities	$	4,381

Schedule of Future Minimum Payments for Capital Leases

The future minimum payments for the Indianapolis and Telford capital leases that the Company entered into as of December 31, 2017, are as follows (in thousands):

Fiscal Years	Payments
2018	$	759
2019		774
2020		790
2021		805
2022		821
Thereafter		5,756
Total payments		9,705
Less amount representing interest		(1,705	)
Present value of future minimum lease payments		8,000
Less current portion of capital lease obligation included in accounts payable and accrued expenses		(501	)
Long-term portion of capital lease obligation included in other liabilities	$	7,499

Schedule of Capital Lease Assets Included in Condensed Consolidated Balance Sheets

Capital lease assets included in the Consolidated Balance Sheets as part of property, plant, and equipment as of December 31, 2017, are as follows (in thousands):

	December 31, 2017			December 31, 2016			Depreciable Life (Years)

Building and improvements, net of deferred gain	$	4,385		$	4,385			13
Less: Accumulated depreciation		(534	)		(197	)
Total	$	3,851		$	4,188

Summary of Future Annual Minimum Rental Commitments Under Non-Cancellable Operating Lease

We lease certain facilities on a year-to-year basis. We also have future annual minimum rental commitments under noncancelable operating leases as follows:

(Table only in thousands) December 31,	Commitment
2018	$	4,470
2019		3,197
2020		2,477
2021		2,228
2022		1,764
2023 and thereafter		3,128
	$	17,264

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income (Loss) Before Income Taxes

Income (loss) before income taxes was generated in the United States and globally as follows:

(Table only in thousands)	2017			2016			2015
Domestic	$	3,891		$	(39,623	)	$	997
Foreign		(2,482	)		6,659			(4,093	)
	$	1,409		$	(32,964	)	$	(3,096	)

Schedule of Income Tax Provision

Income tax provision consisted of the following for the years ended December 31:

(Table only in thousands)	2017			2016			2015
Current:
Federal	$	6,234		$	4,957		$	3,429
State		388			892			753
Foreign		939			3,191			1,944
		7,561			9,040			6,126
Deferred:
Federal		(2,479	)		(2,794	)		(3,012	)
State		114			(409	)		(563	)
Foreign		(758	)		(547	)		87
		(3,123	)		(3,750	)		(3,488	)
	$	4,438		$	5,290		$	2,638

The income tax provision differs from the statutory rate due to the following:

(Table only in thousands)	2017			2016			2015
Tax expense (benefit) at statutory rate	$	494		$	(11,525	)	$	(1,083	)
Increase (decrease) in tax resulting from:
State income tax, net of federal benefit		367			174			34
Domestic production activities deduction		(235	)		(561	)		(211	)
Intangible asset and goodwill impairment		1,789			17,859			—
Change in uncertain tax position reserves		465			(624	)		(1,281	)
Permanent differences		1,026			(31	)		1,162
Impact of rate differences and adjustments		(20	)		(1,655	)		(1,489	)
United States and foreign tax incentives		(240	)		(1,035	)		(883	)
Non-deductible transaction costs		—			7			1,356
Earnout (income) expense		(1,779	)		2,573			3,928
Change in valuation allowance		1,044			222			483
Audit settlements		—			—			65
Provision-to-return adjustments		(495	)		108			808
Revaluation of deferred tax assets and liabilities		(4,819	)		—			—
Net deemed dividend on repatriation of foreign earnings		6,426			—			—
Other		415			(222	)		(251	)
	$	4,438		$	5,290		$	2,638

Schedule of Net Deferred Tax Assets and Liabilities

(Table only in thousands)	2017			2016
Gross deferred tax assets:
Accrued expenses and other	$	286		$	3
Reserves on assets		2,000			3,078
Share-based compensation awards		436			1,340
Minimum pension / post retirement		2,318			4,197
Net operating loss carry-forwards		3,471			5,932
Tax credit carry-forwards		1,634			1,634
Valuation allowances		(3,873	)		(3,135	)
		6,272			13,049
Gross deferred tax liabilities:
Depreciation		(448	)		(614	)
Goodwill and intangibles		(13,588	)		(23,060	)
Prepaid expenses and inventory		(585	)		(785	)
Revenue recognition		(1,861	)		(1,554	)
		(16,482	)		(26,013	)
Net deferred tax liabilities	$	(10,210	)	$	(12,964	)

Schedule of Reconciliation of Uncertain Tax Position

A reconciliation of the beginning and ending amount of uncertain tax position reserves included in other liabilities on the Consolidated Balance Sheets is as follows:

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2017

Information of Company's Results of Operations

The following unaudited pro forma information represents the Company’s results of operations as if PMFG acquisition had occurred as of January 1, 2014:

(Table only in thousands, except per share data)	Year Ended December 31, 2015
Net sales	$	460,726
Net loss		(29,568	)
Earnings per share:
Basic		(0.87	)
Diluted		(0.87	)

PMFG, Inc. [Member]

Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing after Company Finalized Purchase Accounting

The following table summarizes the fair values of the assets acquired and liabilities assumed at the date of closing after the Company finalized purchase accounting during 2016.

(Table only in thousands)
Current assets (including cash of $27,100)	$	92,293
Property and equipment		24,787
Other assets		953
Assets held for sale (a)		950
Deferred income tax asset		—
Goodwill		59,860
Intangible – finite life		29,940
Intangible – indefinite life		10,280
Total assets acquired		219,063
Current liabilities assumed		(73,364	)
Deferred income tax liability		(800	)
Long term liabilities assumed		(3,961	)
Noncontrolling interest		(4,212	)
Net assets acquired	$	136,726

(a)	The assets held for sale consists primarily of real property, and are valued at the estimated proceeds less cost to sell. The Company has not recorded a gain or loss on the classification of the subject assets to held for sale.

Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Net Sales and Income (Loss) from Operations by Business Segment

	2017			2016			2015
Net Sales (less intra-, inter-segment sales)
(Table only in thousands)
Energy Segment	$	149,514		$	203,376		$	142,150
Environmental Segment		127,279			153,344			158,371
Fluid Handling and Filtration Segment		69,159			61,783			67,610
Corporate and Other (1)		(901	)		(1,492	)		(709	)
Net sales	$	345,051		$	417,011		$	367,422

(1)	Includes adjustment for revenue on intercompany jobs.

	2017			2016			2015
Income (loss) from Operations
(Table only in thousands)
Energy Segment	$	8,987		$	23,575		$	3,488
Environmental Segment		13,703			15,652			17,021
Fluid Handling and Filtration Segment		14,734			(36,209	)		11,741
Corporate and Other (2)		(26,649	)		(26,981	)		(26,592	)
Eliminations		(2,751	)		(1,599	)		(709	)
Income (loss) from operations	$	8,024		$	(25,562	)	$	4,949

(2)	Includes corporate compensation, professional services, information technology, acquisition and integration expenses, and other general and administrative corporate expenses.

Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets

	2017		2016		2015
Property and Equipment Additions
(Table only in thousands)
Energy Segment	$	438	$	569	$	429
Environmental Segment		166		404		166
Fluid Handling and Filtration Segment (3)		382		4,481		150
Corporate and Other		42		7		18
Property and equipment additions	$	1,028	$	5,461	$	763

(3)Includes non-cash additions of $4,385 for property, plant, and equipment acquired under capital leases for the year ended December 31, 2016. See Note 12 for further detail.

	2017		2016		2015
Depreciation and Amortization
(Table only in thousands)
Energy Segment	$	7,866	$	9,555	$	5,293
Environmental Segment		3,297		3,816		4,443
Fluid Handling and Filtration Segment		4,754		5,406		6,331
Corporate and Other		171		126		453
Depreciation and amortization	$	16,088	$	18,903	$	16,520

	December 31,
	2017		2016
Identifiable Assets
(Table only in thousands)
Energy Segment	$	217,033	$	257,566
Environmental Segment		107,910		118,680
Fluid Handling and Filtration Segment		100,916		104,294
Corporate and Other (4)		12,690		18,094
Identifiable assets	$	438,549	$	498,634

(4)	Corporate assets primarily consist of cash and income tax related assets.

Goodwill

	December 31,
	2017		2016
Goodwill
(Table only in thousands)
Energy Segment	$	72,625	$	75,827
Environmental Segment		48,203		48,203
Fluid Handling and Filtration Segment		46,123		46,123
Goodwill	$	166,951	$	170,153

Intra-Segment and Inter-Segment Revenues

The Company has multiple divisions that sell to each other within segments (intra-segment sales) and between segments (inter-segment sales) as indicated in the following tables:

	Year Ended December 31, 2017
						Less Inter-Segment Sales
	Total Sales		Intra - Segment Sales			Environmental			Energy			FHF			Corp and Other			Net Sales to Outside Customers
Net Sales
(Table only in thousands)
Energy Segment	$	158,456	$	(8,834	)	$	(108	)	$	—		$	—		$	—		$	149,514
Environmental Segment		131,356		(3,235	)		—			(787	)		(55	)		—			127,279
Fluid Handling and Filtration Segment		73,652		(3,169	)		(493	)		(832	)		—			—			69,159
Corporate and Other (5)		—		—			—			—			—			(901	)		(901	)
Net Sales	$	363,464	$	(15,238	)	$	(601	)	$	(1,619	)	$	(55	)	$	(901	)	$	345,051

	Year Ended December 31, 2016
						Less Inter-Segment Sales
	Total Sales		Intra - Segment Sales			Environmental			Energy			FHF			Corp and Other			Net Sales to Outside Customers
Net Sales
(Table only in thousands)
Energy Segment	$	207,280	$	(3,506	)	$	(398	)	$	—		$	—		$	—		$	203,376
Environmental Segment		160,959		(4,256	)		—			(3,153	)		(206	)		—			153,344
Fluid Handling and Filtration Segment		64,327		(1,714	)		(317	)		(513	)		—			—			61,783
Corporate and Other (5)		—		—			—			—			—			(1,492	)		(1,492	)
Net Sales	$	432,566	$	(9,476	)	$	(715	)	$	(3,666	)	$	(206	)	$	(1,492	)	$	417,011

	Year Ended December 31, 2015
						Less Inter-Segment Sales
	Total Sales		Intra - Segment Sales			Environmental			Energy			FHF			Corp and Other			Net Sales to Outside Customers
Net Sales
(Table only in thousands)
Energy Segment	$	147,661	$	(4,876	)	$	(635	)	$	—		$	—		$	—		$	142,150
Environmental Segment		167,247		(6,744	)		—			(1,937	)		(195	)		—			158,371
Fluid Handling and Filtration Segment		70,084		(2,277	)		(197	)		—			—			—			67,610
Corporate and Other (5)		—		—			—			—			—			(709	)		(709	)
Net Sales	$	384,992	$	(13,897	)	$	(832	)	$	(1,937	)	$	(195	)	$	(709	)	$	367,422

(5)	Includes adjustment for revenue on intercompany jobs.

Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Earnings per share amounts are computed independently each quarter. Accordingly, the sum of each quarter’s per share amount may not equal the total per share amount for the respective year.

	Quarter
(Table only in thousands, except per share data)	First		Second		Third		Fourth
Year ended December 31, 2017
Net sales	$	92,651	$	93,870	$	84,987	$	73,543
Gross profit		31,929		28,486		27,133		25,646
Net income (loss)		38		5,486		3,036		(11,589	)
Net income (loss) attributable to CECO Environmental Corp.		38		5,486		3,036		(11,589	)
Basic earnings (loss) per share	$	0.00	$	0.16	$	0.09	$	(0.34	)
Diluted earnings (loss) per share	$	0.00	$	0.16	$	0.09	$	(0.34	)

Year ended December 31, 2016
Net sales	$	103,175	$	112,258	$	101,596	$	99,982
Gross profit		31,586		33,930		33,676		35,667
Net income (loss)		3,055		4,037		5,826		(51,172	)
Net income (loss) attributable to CECO Environmental Corp.		3,100		4,050		5,804		(51,172	)
Basic earnings (loss) per share	$	0.09	$	0.12	$	0.17	$	(1.49	)
Diluted earnings (loss) per share	$	0.09	$	0.12	$	0.17	$	(1.49	)

Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) shares in Millions		12 Months Ended
	Jul. 12, 2016	Dec. 31, 2018	Dec. 31, 2017 USD ($) Subsidiary Building Land Equipment shares	Dec. 31, 2016 USD ($) Building Land Equipment shares	Dec. 31, 2015 USD ($) shares	Jan. 01, 2017 USD ($)
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Cash equivalents and restricted cash, original maturities of highly liquid investments			3 months
Accounts receivables payment period from invoice date			30 days
Number of building held for sale \| Building			3	2
Number of tracts of land held for sale \| Land			2	2
Number of equipment held for sale \| Equipment			1	1
Property, Plant and Equipment, Useful Life			13 years
Incurred or capitalized deferred financing costs			$ 700,000	$ 0	$ 2,900,000
Percentage of Completion Revenue				7,900,000
Provision for Estimated losses on uncompleted contracts			0	0
Advertisement expense			$ 900,000	$ 900,000	$ 1,000,000
U.S. federal corporate statutory tax rate			35.00%
One-time transition tax period payable on mandatory deemed repatriation of cumulative foreign earnings			8 years
Transition tax imposed for distributions foreign earnings			$ 0
Provisional amounts for GILTI			$ 0
Anti-dilutive options and warrants and unvested restricted stock units outstanding \| shares			0.7	1.6	1.5
Foreign Currency Transaction Gain (Loss)			$ 100,000	$ 700,000	$ (1,700,000)
Scenario Forecast [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
U.S. federal corporate statutory tax rate		21.00%
Interest Expense [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Amortization of deferred finance cost			1,000,000	1,100,000	800,000
Discount to Debt [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Capitalized deferred financing costs			$ 2,800,000	$ 3,200,000
Modification of Credit Agreement [Member] \| Interest Expense [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Amortization of deferred finance cost					$ 300,000
Tradename [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Useful Life			10 years
Non-compete Agreements [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Useful Life			5 years
ASU 2015-11 [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Inventory valued on last-in, first-out method			14.00%	8.00%
ASU 2016-09 [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Discrete tax benefit			$ 400,000
ASU 2016-09 [Member] \| Retained Earnings (Loss) [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment to reduce retained earnings						$ 100,000
CECO Filters, Inc. and Subsidiaries ("CFI") [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries \| Subsidiary			1
Fisher-Klosterman, Inc. ("FKI") [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries \| Subsidiary			3
Met-Pro Technologies LLC ("Met-Pro") [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries \| Subsidiary			8
CECO Group, Inc. [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries \| Subsidiary			2
Peerless Mfg. Co. ("PMFG") [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries \| Subsidiary			5
Ownership percentage by parent	100.00%		60.00%
Percentage of ownership by parent in net income loss	40.00%		80.00%
Maximum [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Installed equipment base with end users			$ 5,000,000,000
Maximum [Member] \| Technology [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Useful Life			10 years
Maximum [Member] \| Customer Lists [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Useful Life			20 years
Maximum [Member] \| Building and Improvements [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			40 years
Maximum [Member] \| Machinery and Equipment [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			15 years
Minimum [Member] \| Technology [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Useful Life			7 years
Minimum [Member] \| Customer Lists [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, Useful Life			5 years
Minimum [Member] \| Building and Improvements [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			5 years
Minimum [Member] \| Machinery and Equipment [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			2 years

Nature of Business and Summary of Significant Accounting Policies - Consolidated Financial Statements Include Accounts of Subsidiaries (Detail)	Dec. 31, 2017
CECO Group, Inc. [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
CECO Group Global Holdings LLC [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
CECO Filters, Inc. and Subsidiaries ("CFI") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	99.00%
The Kirk And Blum Manufacturing Company [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
CECO Air Quality Solutions, Inc [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
EFFOX, Inc. ( "Effox") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
Fisher-Klosterman, Inc. ("FKI") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
Flextor, Inc. ("Flextor") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
Adwest Technologies, Inc. ('Adwest') [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
Met-Pro Technologies LLC ("Met-Pro") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%
Peerless Mfg. Co. ("PMFG") [Member]
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items]
CECO Group Global Holdings LLC	100.00%

Nature of Business and Summary of Significant Accounting Policies - Number of Shares Outstanding for Calculation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Basic net loss and loss per share, Numerator (Loss)	$ (11,589)	$ 3,036	$ 5,486	$ 38	$ (51,172)	$ 5,826	$ 4,037	$ 3,055	$ (3,029)	$ (38,218)	$ (5,602)
Diluted net loss and loss per share, Numerator (Loss)									$ (3,029)	$ (38,218)	$ (5,602)
Basic net loss and loss per share, Denominator (Shares)									34,445,256	33,979,549	28,791,662
Diluted net loss and loss per share Denominator (Shares)									34,445,256	33,979,549	28,791,662
Basic net loss and loss per share, Per Share Amount	$ (0.34)	$ 0.09	$ 0.16	$ 0.00	$ (1.49)	$ 0.17	$ 0.12	$ 0.09	$ (0.09)	$ (1.12)	$ (0.19)
Diluted net loss and loss per share, Per Share Amount	$ (0.34)	$ 0.09	$ 0.16	$ 0.00	$ (1.49)	$ 0.17	$ 0.12	$ 0.09	$ (0.09)	$ (1.12)	$ (0.19)

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Of Financial Instruments [Line Items]
Fair value of note payable	$ 5,300	$ 5,300
Cash and cash equivalents	29,902	45,824	$ 34,194	$ 18,162
Cash held outside United States, principally in Netherlands, United Kingdom, China, and Canada	19,700	25,600
Credit Facility [Member]
Fair Value Of Financial Instruments [Line Items]
Fair value of debt issued	$ 114,900	$ 125,100

Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 60,543	$ 72,835
Allowance for doubtful accounts	(4,156)	(1,749)
Total accounts receivable	67,990	83,062
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 11,603	$ 11,976

Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Amount billed but not received under retainage provisions in contracts	$ 2,500	$ 3,200
Retainage receivables on contracts minimum period	1 year
Retainage receivables on contracts maximum period	2 years
Provision for doubtful accounts	$ 3,895	848	$ 702
Charge-offs	$ 1,500	$ 300	$ 200

Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 169,665	$ 186,609
Estimated earnings	61,556	77,709
Total costs and estimated earnings on uncompleted contracts, gross	231,221	264,318
Less billings to date	(217,743)	(261,280)
Total costs and estimated earnings on uncompleted contracts, net	13,478	3,038
Included in the accompanying consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	33,947	38,123
Billings in excess of costs and estimated earnings on uncompleted contracts	(20,469)	(35,085)
Total costs and estimated earnings on uncompleted contracts, net	$ 13,478	$ 3,038

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Net [Abstract]
Raw materials	$ 18,444	$ 17,889
Work in process	3,182	3,986
Finished goods	940	1,508
Obsolescence allowance	(1,597)	(1,896)
Total inventories	$ 20,969	$ 21,487

Inventories - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Amounts credited to the allowance for obsolete inventory	$ (0.2)	$ (1.2)	$ (0.7)
Items charged to the allowance for inventory write-offs	$ 0.6	$ 0.2	$ 0.2

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 44,758	$ 43,723
Less accumulated depreciation	(21,358)	(16,453)
Property, plant and equipment, net	23,400	27,270
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,627	1,617
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,063	19,887
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 25,068	$ 22,219

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Depreciation expense	$ 4.5	$ 5.0	$ 4.2

Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, beginning balance		$ 170,153	$ 220,163
Goodwill, acquisitions and related adjustments			4,205
Goodwill, impairment charge		(4,443)	(53,762)
Goodwill, foreign currency translation		1,241	(453)
Goodwill, ending balance	$ 166,951	166,951	170,153
Tradename, beginning balance		22,042	26,337
Tradename, impairment charge		(2,725)	(4,161)
Tradename, foreign currency adjustments		374	(134)
Tradename, ending balance	19,691	19,691	22,042
Energy Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance		75,827	72,075
Goodwill, acquisitions and related adjustments			4,205
Goodwill, impairment charge	(4,400)	(4,443)
Goodwill, foreign currency translation		1,241	(453)
Goodwill, ending balance	72,625	72,625	75,827
Environmental Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance		48,203	55,031
Goodwill, impairment charge			(6,828)
Goodwill, ending balance	48,203	48,203	48,203
Fluid Handling and Filtration Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance		46,123	93,057
Goodwill, impairment charge			(46,934)
Goodwill, ending balance	$ 46,123	$ 46,123	$ 46,123

Goodwill and Intangible Assets - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Unit	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Aggregate amount of goodwill acquired	$ 242,300,000	$ 242,300,000	$ 241,100,000
Aggregate amount of impairment	75,300,000	75,300,000	70,900,000
Goodwill, impairment charge		$ 4,443,000	53,762,000
Number of reporting units \| Unit		3
Goodwill	166,951,000	$ 166,951,000	170,153,000	$ 220,163,000
Intangible assets – indefinite life	19,691,000	19,691,000	22,042,000	26,337,000
Impairment of intangible assets		2,725,000	4,161,000
Asset impairment charges		0
Amortization expense of finite life intangible assets		11,500,000	13,900,000	$ 12,300,000
Amortization expense of finite life intangibles for 2018	10,100,000	10,100,000
Amortization expense of finite life intangibles for 2019	8,900,000	8,900,000
Amortization expense of finite life intangibles for 2020	7,200,000	7,200,000
Amortization expense of finite life intangibles for 2021	5,900,000	5,900,000
Amortization expense of finite life intangibles for 2022	4,900,000	4,900,000
Weighted average amortization period for finite lived assets acquired				8 years 8 months 12 days
Zhongli, Inc. [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Impairment of intangible assets		900,000
Unit Four [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Impairment of intangible assets		500,000
Unit Three [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Impairment of intangible assets		300,000
Energy Segment [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill, impairment charge	4,400,000	4,443,000
Goodwill	72,625,000	72,625,000	75,827,000	$ 72,075,000
Environmental Segment [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill, impairment charge			6,828,000
Goodwill	48,203,000	48,203,000	48,203,000	55,031,000
Four Reporting Units [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill, impairment charge			53,800,000
Intangible assets – indefinite life	$ 13,100,000	$ 13,100,000
Fair value lower than the aggregate carrying value	20.70%	20.70%
Impairment of intangible assets			4,200,000
Three Reporting Units [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill, impairment charge				0
Impairment of intangible assets		$ 2,700,000		$ 3,300,000
PMFG, Inc. [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Decrease in property and equipment			5,500,000
Decrease in current assets			1,700,000
Decrease in deferred income tax liability			1,100,000
Decrease in noncontrolling interest			1,800,000
Goodwill			$ 59,860,000
Unit One [Member] \| Environmental Segment [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 32,400,000	$ 32,400,000
Percentage of fair value exceeding carrying value of goodwill		6.00%
Decrease in projected revenue growth rates		0.11%
Decrease in projected operational profit growth rates		0.65%
Unit Two [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Impairment of intangible assets		$ 1,000,000
Unit Two [Member] \| Energy Segment [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill	59,900,000	$ 59,900,000
Percentage of fair value exceeding carrying value of goodwill		3.00%
Decrease in projected revenue growth rates		0.04%
Decrease in projected operational profit growth rates		0.16%
Unit Three [Member] \| Energy Segment [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 5,700,000	$ 5,700,000
Percentage of fair value exceeding carrying value of goodwill		2.00%
Decrease in projected revenue growth rates		0.01%
Decrease in projected operational profit growth rates		0.20%

Goodwill and Intangible Assets - Summary of Finite Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Cost	$ 94,658	$ 92,908
Accumulated Amortization	44,702	32,180
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	15,867	15,867
Accumulated Amortization	8,609	6,360
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	77,497	77,497
Accumulated Amortization	35,024	26,041
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,118	1,118
Accumulated Amortization	698	478
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,390	1,390
Accumulated Amortization	440	301
Foreign Currency Adjustments [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	(1,214)	(2,964)
Accumulated Amortization	$ (69)	$ (1,000)

Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Trade accounts payable, including amounts due to subcontractors	$ 45,409	$ 58,985
Compensation and related benefits	5,246	8,232
Current portion of earnout liability	2,989	13,527
Accrued warranty	4,464	2,684
Other	12,678	12,182
Total accounts payable and accrued expenses	$ 70,786	$ 95,610

Accounts Payable and Accrued Expenses - Summary of Current Portion of Earnout Liabilities and Long term Portion of Earnout Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition Contingent Consideration [Line Items]
Earnout accrued at beginning of period	$ 24,213	$ 32,670
Fair value adjustment	(6,610)	4,218	$ 11,222
Compensation expense adjustment	1,240	1,213
Foreign currency translation adjustment	825	(1,346)
Exchange of earnout for accounts receivable		(3,272)
Payment	(15,193)	(9,270)
Total earnout liability at end of period	4,475	24,213	32,670
Less: current portion of earnout	(2,989)	(13,527)
Balance of long term portion of earnout recorded in other liabilities at end of period	1,486	10,686
Energy Segment [Member]
Business Acquisition Contingent Consideration [Line Items]
Earnout accrued at beginning of period	24,213	30,403
Fair value adjustment	(6,610)	6,485
Compensation expense adjustment	1,240	1,213
Foreign currency translation adjustment	825	(1,346)
Exchange of earnout for accounts receivable		(3,272)
Payment	(15,193)	(9,270)
Total earnout liability at end of period	4,475	24,213	30,403
Less: current portion of earnout	(2,989)	(13,527)
Balance of long term portion of earnout recorded in other liabilities at end of period	$ 1,486	10,686
Environmental Segment [Member]
Business Acquisition Contingent Consideration [Line Items]
Earnout accrued at beginning of period		2,267
Fair value adjustment		$ (2,267)
Total earnout liability at end of period			$ 2,267

Senior Debt - Summary of Debt (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total outstanding borrowings	$ 114,833,000	$ 123,193,000
Less: current portion	11,296,000	8,827,000
Total debt, less current portion	103,537,000	114,366,000
Term Loan [Member]
Debt Instrument [Line Items]
Total outstanding borrowings	113,903,000	125,072,000
China Facility [Member]
Debt Instrument [Line Items]
Total outstanding borrowings under Credit Facility	0	1,300,000
US Dollar Borrowings [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Total outstanding borrowings	112,069,000	121,897,000
US Dollar Borrowings [Member] \| U.S. Dollar Revolving Loans [Member]
Debt Instrument [Line Items]
Total outstanding borrowings under Credit Facility	1,000,000
US Dollar Borrowings [Member] \| China Facility [Member]
Debt Instrument [Line Items]
Total outstanding borrowings under Credit Facility		1,296,000
Term Debt [Member]
Debt Instrument [Line Items]
Unamortized debt discount	(2,834,000)	$ (3,175,000)
Aarding Thermal Acoustics B.V. ("Aarding") [Member] \| US Dollar Borrowings [Member]
Debt Instrument [Line Items]
Total outstanding borrowings	$ 2,764,000

Senior Debt - Summary of Debt (Parenthetical) (Detail) - Term Loan [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Debt Instrument, Redemption, through September 2017 [Member]
Debt Instrument [Line Items]
Outstanding borrowings, quarterly principal installments payable amount	$ 2.0
Term loans, year of maturity	2018-09
Debt Instrument, Redemption, through September 2020 [Member]
Debt Instrument [Line Items]
Outstanding borrowings, quarterly principal installments payable amount	$ 2.5
Term loans, year of maturity	2020-09

Senior Debt - Additional Information (Detail) - USD ($)			12 Months Ended
Senior Debt - Additional Information (Detail) - USD ($)	Mar. 08, 2018	Oct. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2019	Mar. 31, 2019	Oct. 30, 2017	Sep. 03, 2015
Line Of Credit Facility [Line Items]
Prepayment of outstanding debt			$ 4,300,000
Credit facility, principal payment 2018			8,500,000
Credit facility, principal payment 2019			10,000,000
Credit facility, principal payment 2020			$ 96,400,000
Credit facility, date of amendment		Oct. 31, 2017	Jun. 09, 2017
Maximum consolidated leverage ratio		375.00%						325.00%
Weighted average interest rate on outstanding borrowings			4.08%	3.26%
Interest rate swap, fair value, asset			$ 300,000
Interest rate swap, fair value, liability				$ 200,000
Changes in fair value income (loss)				500,000
ING Bank N.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Total borrowing capacity			$ 15,500,000
Maximum debt as proportion of EBITDA			3.00%
ING Bank N.V. ("Aarding") [Member] \| Bank Overdrafts [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 2,800,000	$ 0
Weighted average interest rate on outstanding borrowings			1.95%	1.95%
Total borrowing capacity			$ 7,200,000
Debt instrument variable interest rate description			Three months Euribor plus 195 basis points		Three months Euribor plus 195 basis points
Subsequent Event [Member] \| ING Bank N.V. ("Aarding") [Member] \| Bank Overdrafts [Member]
Line Of Credit Facility [Line Items]
Settled outstanding amount of credit facility	$ 2,800,000
Minimum [Member] \| ING Bank N.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Borrowers solvency ratio			30.00%
Cross Currency Interest Rate Contract [Member] \| Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			2.00%
Cross Currency Interest Rate Contract [Member] \| Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			3.00%
Federal Funds Rate [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			0.50%
One-Month LIBOR [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Base Rate [Member] \| Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Base Rate [Member] \| Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on variable rate			2.00%
Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Unused credit availability under credit facility			$ 54,600,000	$ 62,000,000
Credit Agreement [Member] \| Netherlands and China Facilities [Member]
Line Of Credit Facility [Line Items]
Unused credit availability under credit facility			13,500,000	11,400,000
Debenture Agreement [Member] \| Germany [Member]
Line Of Credit Facility [Line Items]
Cash deposit			200,000	900,000
Scenario Forecast [Member]
Line Of Credit Facility [Line Items]
Maximum consolidated leverage ratio						325.00%	350.00%
Term Loan [Member]
Line Of Credit Facility [Line Items]
Increased credit facility commitment for either revolving credit facility or term loan facility									$ 170,000,000
U.S. Dollar Revolving Loans [Member]
Line Of Credit Facility [Line Items]
Decreased credit facility commitment for either revolving credit facility or term loan facility									60,500,000
Multi-currency Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities									$ 19,500,000
Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			24,400,000	18,000,000
Letters of Credit [Member] \| Netherlands and China Facilities [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			3,900,000	5,300,000
Bank Guarantee Facility [Member] \| Singapore [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			1,000,000	1,700,000
Cash deposit			100,000	300,000
Bank Guarantee Facility [Member] \| ING Bank N.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 3,900,000	$ 5,300,000
Weighted average interest rate on outstanding borrowings			2.65%	2.65%
Total borrowing capacity			$ 8,300,000
Debt instrument variable interest rate description			Three months Euribor plus 265 basis points		Three months Euribor plus 265 basis points
China Facility [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 0	$ 1,300,000
Total borrowing capacity			$ 4,600,000	4,300,000
Interest rate			4.79%
Credit facility expiration date			Apr. 12, 2018
Letter Of Credit And Bank Guarantees [Member] \| Debenture Agreement [Member] \| United Kingdom [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			$ 8,000,000	9,000,000
Outstanding stand-by letters of credit and bank guarantees			7,000,000	6,200,000
Letter Of Credit And Bank Guarantees [Member] \| Debenture Agreement [Member] \| Germany [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities			200,000	900,000
Outstanding stand-by letters of credit and bank guarantees			$ 200,000	$ 900,000

Shareholders' Equity - Schedule of Dividend Declared (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares
Record Date One [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.075
Record Date	Aug. 07, 2017
Payment Date	Sep. 29, 2017
Record Date Two [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.075
Record Date	May 10, 2017
Payment Date	Jun. 30, 2017
Record Date Three [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.075
Record Date	Mar. 06, 2017
Payment Date	Mar. 31, 2017
Record Date Four [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Dec. 16, 2016
Payment Date	Dec. 30, 2016
Record Date Five [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Sep. 16, 2016
Payment Date	Sep. 30, 2016
Record Date Six [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Jun. 18, 2016
Payment Date	Jun. 30, 2016
Record Date Seven [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Mar. 18, 2016
Payment Date	Mar. 31, 2016
Record Date Eight [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Dec. 16, 2015
Payment Date	Dec. 30, 2015
Record Date Nine [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Sep. 18, 2015
Payment Date	Sep. 30, 2015
Record Date Ten [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Jun. 12, 2015
Payment Date	Jun. 26, 2015
Record Date Eleven [Member]
Dividends Declared [Line Items]
Dividend Per Share	$ 0.066
Record Date	Mar. 19, 2015
Payment Date	Mar. 31, 2015

Shareholders' Equity - Additional Information (Detail) - USD ($)			1 Months Ended		12 Months Ended
	Jun. 10, 2017	May 16, 2017	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 13, 2012
Class of Stock [Line Items]
Issuance of common stock Dividend Reinvestment Plan				100,000,000	100,000,000	100,000,000
Number of stock option granted		0			128,000	105,000	286,000
Number of performance-based awards outstanding				53,000		53,000
Number of performance-based awards forfeited					53,000
Share-based compensation expense					$ 1,700,000	$ 2,200,000	$ 1,900,000
Tax benefit related to stock based compensation expense					$ 0	200,000	0
Number of shares authorized in employee stock purchase plan					1,500,000
Employee stock purchase plan period					10 years
Employee stock purchase plan number of shares remain available for future issuance					1,400,000
Discount from market price					15.00%
Employees offering dates intervals					6 months
Employee stock purchase plan expense					$ 83,000	$ 71,000	$ 54,000
Weighted-average fair value of stock options granted					$ 2.68	$ 2.07	$ 4.35
Expected Volatility Rate					39.00%	39.00%	44.00%
Expected Term Period					6 years 3 months 18 days	6 years 6 months	6 years 3 months 18 days
Risk-Free Interest Rate					2.20%	2.10%	1.90%
Expected dividend rate					3.30%	3.60%	2.40%
Cash received from employee stock option exercised					$ 1,100,000	$ 1,300,000	$ 100,000
Intrinsic value of option exercised					$ 2,600,000	$ 1,000,000	$ 200,000
Warrants issued to acquire Icarus Share					250,000
Warrants exercise price					$ 9.07
Warrants expiration date					Dec. 26, 2016
Common stock, shares issued				34,300,209	34,707,924	34,300,209
Warrant outstanding				0	0	0
Aggregate value transaction value of share purchased						$ 1,238,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares issued				89,640		89,640
Shares issued, price per share				$ 9.07		$ 9.07
Share purchased					0	105,000	0
Aggregate value transaction value of share purchased						$ 1,000
Common Stock [Member] \| Former Owner of Subsidiary Acquired [Member]
Class of Stock [Line Items]
Share purchased						30,000
Aggregate value transaction value of share purchased						$ 200,000
Common Stock [Member] \| Current Segment President [Member]
Class of Stock [Line Items]
Share purchased				75,000		75,000
Aggregate value transaction value of share purchased			$ 1,100,000
Performance Units [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period	3 years
Maximum shares of common stock participant could receive per performance	77,778
Common stock price threshold consecutive trading days	30 days
Period to earn units based on stock price during thirty consecutive trading days	2 years
Performance Units [Member] \| Chief Executive Officer [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period	3 years
Number of stock awards granted	700,000
Value of stock awards granted	$ 175,000
Restricted Stock and Performance Units [Member]
Class of Stock [Line Items]
Unrecognized compensation expense related to stock options and restricted stock					$ 5,000,000
Weighted average vesting period					2 years 8 months 12 days
Dividend Reinvestment Plan [Member]
Class of Stock [Line Items]
Issuance of common stock Dividend Reinvestment Plan								750,000
2017 Plan [Member]
Class of Stock [Line Items]
Shares available for future grant					2,000,000
Number of stock option granted					128,000
Number of restricted stock awards granted					351,000
2017 Plan [Member] \| Common Stock [Member]
Class of Stock [Line Items]
Number of shares reserved for issuance		1,900,000
2017 Plan [Member] \| Minimum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					3 years
2017 Plan [Member] \| Maximum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					4 years
2017 Plan [Member] \| Employee Stock Option [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					4 years
2007 Plan [Member]
Class of Stock [Line Items]
Shares available for future grant				414,000		414,000
Number of stock option granted					0	105,000
Number of restricted stock awards granted					54,000	267,000
Number of shares reserved for issuance				3,300,000		3,300,000
2007 Plan [Member] \| Minimum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					4 years
2007 Plan [Member] \| Maximum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					5 years
2007 Plan [Member] \| Employee Stock Option [Member] \| Minimum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					3 years
2007 Plan [Member] \| Employee Stock Option [Member] \| Maximum [Member]
Class of Stock [Line Items]
2017 stock options or stock awards, vesting period					5 years
2007 Plan [Member] \| Restricted Stock [Member]
Class of Stock [Line Items]
Number of stock awards granted					405,000
Weighted-average fair value of restricted stock awards granted					$ 9.88	$ 9.76	$ 9.48

Shareholders' Equity - Summary of Stock Option (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 16, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Beginning balance of outstanding shares		1,519,000	1,877,000	1,727,000
Granted, Shares	0	128,000	105,000	286,000
Forfeitures, Shares		(700,000)	(268,000)	(106,000)
Exercised, Shares		(292,000)	(195,000)	(30,000)
Ending balance of outstanding, shares		655,000	1,519,000	1,877,000	1,727,000
Exercisable, Shares		463,000	959,000	977,000
Beginning Balance of Outstanding Weighted Average Exercise Price		$ 10.25	$ 10.30	$ 10.12
Granted, Weighted Average Exercise Price		9.24	7.36	11.55
Forfeitures, Weighted Average Exercise Price		12.44	11.91	12.31
Exercised, Weighted Average Exercise Price		3.92	6.90	4.47
Ending Balance of Outstanding Weighted Average Exercise Price		10.53	10.25	10.30	$ 10.12
Exercisable, Weighted Average Exercise Price		$ 10.49	$ 9.23	$ 8.48
Outstanding, Weighted Average Remaining Contractual Term		6 years	6 years 1 month 6 days	6 years 9 months 18 days	7 years 3 months 18 days
Exercisable, Weighted Average Remaining Contractual Term		5 years 2 months 12 days	5 years 3 months 18 days	5 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value		$ 78	$ 5,816	$ 1,769
Exercisable, Aggregate Intrinsic Value		$ 78	$ 4,608	$ 1,765

Shareholders' Equity - Summary of Restricted Stock Awards (Detail) - Restricted Stock [Member] - 2007 Plan [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Summary Of Restricted Stock Unit Activity [Line Items]
Beginning balance , Nonvested shares	509
Granted , Nonvested shares	405
Vested , Nonvested shares	(92)
Forfeited , Nonvested shares	(268)
Ending balance , Nonvested shares	554	509
Beginning balance ,Weighted average grant date fair value	$ 9.64
Granted ,Weighted average grant date fair value	9.88	$ 9.76	$ 9.48
Vested , Weighted average grant date fair value	9.78
Forfeited , Weighted average grant date fair value	9.70
Ending balance , Weighted average grant date fair value	$ 9.75	$ 9.64

Pension and Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in projected benefit obligation:
Service cost	$ 415	$ 447	$ 233
Interest cost	1,314	1,426	1,412
Change in plan assets:
Fair value of plan assets at beginning of year	24,063
Fair value of plan assets at end of year	26,836	24,063
Accumulated other comprehensive income:
Amount recognized in accumulated other comprehensive income	$ (5,161)	$ (5,083)	$ (5,170)	$ (4,878)
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate	3.85%	4.00%	3.75%
Compensation increase rate	0.00%	0.00%	0.00%
Pension Benefits [Member]
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 35,012	$ 36,140	$ 38,208
Service cost	415	447	233
Interest cost	1,314	1,426	1,412
Actuarial loss/(gain)	1,787	301	(1,744)
Administrative expenses	(402)	(606)	(214)
Benefits paid	(1,799)	(2,696)	(1,755)
Projected benefit obligation at end of year	36,327	35,012	36,140
Change in plan assets:
Fair value of plan assets at beginning of year	24,063	25,296	27,302
Actual return (loss) on plan assets	3,152	2,040	(443)
Employer contribution	1,822	29	406
Administrative expenses	(402)	(606)	(214)
Benefits paid	(1,799)	(2,696)	(1,755)
Fair value of plan assets at end of year	26,836	24,063	25,296
Unfunded status	(9,491)	(10,949)	(10,844)
Defined benefit liabilities included in other liabilities	(9,491)	(10,949)	(10,844)
Deferred tax benefit associated with accumulated other comprehensive loss	3,153	3,107	3,154
Accumulated other comprehensive loss, net of tax	5,154	5,074	5,144
Net amount recognized	(1,184)	(2,768)	(2,546)
Other comprehensive income (loss):
Net loss (gain)	358	90	708
Amortization of net actuarial (gain)/loss	(227)	(212)	(258)
Total recognized in other comprehensive income (loss)	131	(122)	450
Accumulated other comprehensive income:
Net loss (gain)	8,307	8,181	8,298
Amount recognized in accumulated other comprehensive income	$ 8,307	$ 8,181	$ 8,298
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate	3.35%	3.85%	4.00%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Change in projected benefit obligation:
Accumulated postretirement benefit obligation at beginning of year	$ 131	$ 159	$ 155
Interest cost	4	4	5
Amendments			9
Actuarial loss/(gain)	3	(8)	18
Benefits paid	(26)	(24)	(28)
Accumulated postretirement benefit obligation at end of year	112	131	159
Change in plan assets:
Employer contribution	26	24	28
Benefits paid	(26)	(24)	(28)
Unfunded status	(112)	(131)	(159)
Defined benefit liabilities included in accounts payable and accrued expenses	(24)	(25)	(26)
Defined benefit liabilities included in other liabilities	(88)	(106)	(133)
Deferred tax benefit associated with accumulated other comprehensive loss	12	15	15
Accumulated other comprehensive loss, net of tax	7	9	27
Net amount recognized	(93)	(107)	(117)
Other comprehensive income (loss):
Net loss (gain)	3	(9)	17
Prior service cost			9
Amortization of prior service cost	(11)	(10)	(9)
Amortization of net actuarial (gain)/loss	3	1	3
Total recognized in other comprehensive income (loss)	(5)	(18)	20
Accumulated other comprehensive income:
Net loss (gain)	(22)	(28)	(20)
Prior service cost	41	52	62
Amount recognized in accumulated other comprehensive income	$ 19	$ 24	$ 42
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate	2.65%	2.75%	3.00%

Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit And Contribution Plan Disclosure [Line Items]
Increase (decrease) in minimum liability after tax of defined benefit plans	$ 100,000	$ (100,000)	$ 300,000
Current Assets Mix percentage	100.00%	100.00%
Assumed average annual returns	7.25%	7.50%	7.50%
Defined benefit plan change in discount rate projected benefit obligation	$ 1,100,000
Net Periodic Pension Cost	9,000
Defined benefit plan, assumed long-term rate of return on assets	66,000
Net periodic benefit cost	$ 233,000	$ 256,000	$ (106,000)
Listing under plans Forms 5500 as providing more than 5% contribution	false
Liability has been provided in the accompanying consolidated financial statements	$ 0
Amounts charged to pension expense	2,000,000	2,100,000	1,300,000
Aggregate matching contributions and discretionary contributions Amount	$ 1,600,000	1,500,000	1,200,000
PMFG, Inc. [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Total cash contribution by employer			100,000
Employee Deferral Category One [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Profit sharing and 401(k) savings retirement plan for non-union employees Description	The plan covers substantially all employees who have 30 days of service, and who have attained 18 years of age.
Percentage of Employee salary deferral provision	100.00%
Yellow Zone
Defined Benefit And Contribution Plan Disclosure [Line Items]
Plans Funded Status Description	Between 65 and less than 80 percent
Red Zone
Defined Benefit And Contribution Plan Disclosure [Line Items]
Plans Funded Status Description	Less than 65 percent
Green Zone
Defined Benefit And Contribution Plan Disclosure [Line Items]
Plans Funded Status Description	At least 80 percent
Pension Plan [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Net loss for the defined benefit pension plan to be amortized in next year	$ 200,000
Prior service cost for the defined benefit pension plan to be amortized in next year	2,000
Estimated pension plan cash obligations payable in 2018	1,900,000
Estimated pension plan cash obligations payable in 2019	2,100,000
Estimated pension plan cash obligations payable in 2020	2,200,000
Estimated pension plan cash obligations payable in 2021	2,100,000
Estimated pension plan cash obligations payable in 2022	2,200,000
Estimated pension plan cash obligations payable in 2023 through 2027	10,700,000
Health Care Plan [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Net loss for the defined benefit pension plan to be amortized in next year	0
Prior service cost for the defined benefit pension plan to be amortized in next year	11,000
Net periodic benefit cost	$ 11,000	$ 15,000	$ 12,000
Weighted average discount rate to determine the net periodic benefit cost	2.75%	3.00%	3.75%
Estimated pension plan cash obligations payable in 2018	$ 24,000
Estimated pension plan cash obligations payable in 2019	20,000
Estimated pension plan cash obligations payable in 2020	17,000
Estimated pension plan cash obligations payable in 2021	14,000
Estimated pension plan cash obligations payable in 2022	11,000
Estimated pension plan cash obligations payable in 2023 through 2027	$ 30,000
Minimum [Member] \| Debt Securities [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Current Assets Mix percentage	30.00%
Assumed average annual returns	4.00%
Minimum [Member] \| Equity Securities [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Current Assets Mix percentage	60.00%
Assumed average annual returns	8.00%
Maximum [Member] \| Debt Securities [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Current Assets Mix percentage	40.00%
Assumed average annual returns	6.00%
Maximum [Member] \| Equity Securities [Member]
Defined Benefit And Contribution Plan Disclosure [Line Items]
Current Assets Mix percentage	70.00%
Assumed average annual returns	12.00%

Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 415	$ 447	$ 233
Interest cost	1,314	1,426	1,412
Expected return on plan assets	(1,723)	(1,829)	(2,009)
Net amortization and deferral	227	212	258
Net periodic benefit cost (income)	$ 233	$ 256	$ (106)

Pension and Employee Benefit Plans - Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Discount rate	3.85%	4.00%	3.75%
Expected return on assets	7.25%	7.50%	7.50%
Compensation increase rate	0.00%	0.00%	0.00%

Pension and Employee Benefit Plans - Details of Defined Benefit Pension Plan Asset Allocation by Asset Category (Detail)	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%
Percentage of Plan Assets	100.00%	100.00%
Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Percentage of Plan Assets	4.00%	4.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
Percentage of Plan Assets	70.00%	67.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Percentage of Plan Assets	26.00%	29.00%

Pension and Employee Benefit Plans - Disclosure of Fair Value Measurements of Pension Plan Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	$ 26,836	$ 24,063
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	18,723	16,153
Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	6,967	7,016
Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	26,836	24,063
Level 1 [Member] \| Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	18,723	16,153
Level 1 [Member] \| Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	6,967	7,016
Cash and cash equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	1,147	894
Cash and cash equivalents [Member] \| Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension assets, at fair value	$ 1,147	$ 894

Pension and Employee Benefit Plans - Summary of Pension Fund General Information (Detail)	12 Months Ended
	Dec. 31, 2017
Sheet Metal Workers' National Pension Fund [Member]
Multiemployer Plans [Line Items]
EIN/Pension Number	526112463
Plan Number	001
Pension Protection Act Zone Status	Yellow
FIP/RP Status Pending/Implemented	Implemented
Surcharge Imposed	No
Expiration of Collective Bargaining Agreement	various
Sheet Metal Workers Local Two Two Four Pension Plan [Member]
Multiemployer Plans [Line Items]
EIN/Pension Number	316171353
Plan Number	001
Pension Protection Act Zone Status	Yellow
FIP/RP Status Pending/Implemented	Implemented
Surcharge Imposed	No
Expiration of Collective Bargaining Agreement	May 31, 2018
Sheet Metal Workers Local Twenty Indianapolis Area Pension Fund [Member]
Multiemployer Plans [Line Items]
EIN/Pension Number	510168516
Plan Number	001
Pension Protection Act Zone Status	Green
FIP/RP Status Pending/Implemented	NA
Surcharge Imposed	No
Expiration of Collective Bargaining Agreement	May 31, 2020
Sheet Metal Workers Local One Seven Seven Pension Fund [Member]
Multiemployer Plans [Line Items]
EIN/Pension Number	626093256
Plan Number	001
Pension Protection Act Zone Status	Green
FIP/RP Status Pending/Implemented	NA
Surcharge Imposed	No
Expiration of Collective Bargaining Agreement	May 1, 2018

Leases - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Aug. 16, 2016	Jun. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2017
Leases Disclosure [Line Items]
Gross proceeds from sale and leaseback agreement				$ 14,244
Sublease agreement period		5 years
Weighted average effective interest rate of initial sale leaseback financing liability			2.22%
Lease agreement term			In June 2017, the Company amended the lease agreement. The amendment extended the lease through June of 2031 and changed the effective weighted average interest rate from the 2.22% to the 4.53%.
Amended lease agreement term			2017-06
Amendment extended lease term			2031-06
Weighted average effective interest rate of sale leaseback financing liability		2.22%				4.53%
Gain on sale of facility	$ 2,000	$ 2,400
Capital lease obligations	$ 3,000	$ 5,700
Capital lease weighted average interest rate	3.25%	3.43%
Rent expense			$ 4,200	4,500	$ 4,000
Denton, Texas Facility [Member]
Leases Disclosure [Line Items]
Gross proceeds from sale and leaseback agreement		$ 5,000
Sale leaseback transaction costs		300
Net proceeds from sale and leaseback agreement		$ 4,700
Initial lease agreement period		13 years
Sale leaseback transaction, net carrying value			$ 11,000	$ 12,300
Telford, Pennsylvania Facility [Member]
Leases Disclosure [Line Items]
Gross proceeds from sale and leaseback agreement		$ 6,000
Sale leaseback transaction costs		400
Net proceeds from sale and leaseback agreement		$ 5,600
Lease agreement period		13 years
Indianapolis, Indiana Facility [Member]
Leases Disclosure [Line Items]
Gross proceeds from sale and leaseback agreement	$ 3,300
Sale leaseback transaction costs	100
Net proceeds from sale and leaseback agreement	$ 3,200
Lease agreement period	13 years

Leases - Schedule of Future Payment on Sale-leaseback Financing Liability (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Leases [Abstract]
2018	$ 406
2019	414
2020	422
2021	431
2022	439
Thereafter	4,106
Total payments	6,218
Less amount representing interest	(1,635)
Total sale-leaseback financing liability	4,583
Less current portion of sale-leaseback financing liability included in accounts payable and accrued expenses	(202)
Long-term portion of sale-leaseback financing liability included in other liabilities	$ 4,381

Leases - Schedule of Future Minimum Payments for Capital Leases (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Leases [Abstract]
2018	$ 759
2019	774
2020	790
2021	805
2022	821
Thereafter	5,756
Total payments	9,705
Less amount representing interest	(1,705)
Present value of future minimum lease payments	8,000
Less current portion of capital lease obligation included in accounts payable and accrued expenses	(501)
Long-term portion of capital lease obligation included in other liabilities	$ 7,499

Leases- Schedule of Capital Lease Assets Included in Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Building and improvements, net of deferred gain	$ 4,385	$ 4,385
Less: Accumulated depreciation	(534)	(197)
Total	$ 3,851	$ 4,188
Depreciable life (years)	13 years

Leases- Summary of Future Annual Minimum Rental Commitments Under Non-Cancellable Operating Lease (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Leases [Abstract]
2018	$ 4,470
2019	3,197
2020	2,477
2021	2,228
2022	1,764
2023 and thereafter	3,128
Operating Leases, Future Minimum Payments Due, Total	$ 17,264

Commitments and Contingencies - Additional Information (Detail)		1 Months Ended	12 Months Ended			192 Months Ended
	Oct. 03, 2014 USD ($)	Oct. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Case	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($) Case	Dec. 31, 2016 Case
Loss Contingencies [Line Items]
Cumulative settlement payments for cases involving asbestos-related claims		$ 500,000		$ 200,000	$ 500,000	$ 1,300,000
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses						1,200,000
Average cost per settled claim excluding legal fees			$ 28,000			$ 28,000
Number of claims pending \| Case			218			218	229
Number of new cases filed \| Case			51
Number of cases dismissed \| Case			56
Number of cases settled \| Case			6
Settlement recovering expense					200,000
Loss amount awarded for damage	$ 600,000
Loss amount not paid under the contract	$ 200,000
Loss contingency settlement terms			After a trial in 2015, the Court issued Findings of Fact and Conclusions of Law that provide that we breached our contract with Viron and that Viron is entitled to damages in the amount of approximately $0.6 million plus attorneys’ fees. Additionally, the Court concluded that we are not entitled to an offset for the invoiced amounts of $0.2 million not paid by Viron under the contract.
Cumulative settlement paid for cases involving asbestos-related claims				$ 200,000
Assessment regarding Loss contingency impact Description			We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, results of operations, or cash flows.
Previously Reported [Member]
Loss Contingencies [Line Items]
Cumulative settlement payments for cases involving asbestos-related claims					$ 300,000

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
U.S. federal corporate statutory tax rate		35.00%
One-time transition tax period payable on mandatory deemed repatriation of cumulative foreign earnings		8 years
Reduction in net deferred tax assets and liabilities		$ 4,819,000
Provisional amount recorded related to deemed repatriation of foreign earnings		6,426,000
Aggregate undistributed earnings of foreign subsidiaries		15,400,000
Unrecognized deferred income tax liability of the foreign subsidiaries		$ 1,000,000
State and local net operating loss carry forwards year start		2018
State and local net operating loss carry forwards year end		2037
Valuation reserve		$ 3,900,000	$ 3,100,000
Additional income tax expense (benefit)		$ 1,000,000	200,000	$ 600,000
Income tax positions recognized, minimum percentage		50.00%
Expense for interest and penalties		$ 0	$ 0	$ 0
Maximum [Member]
Income Taxes [Line Items]
Decrease in amount of accrual for uncertain tax positions		500,000
Federal Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carry forward		4,900,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carry forward		23,400,000
Overseas Jurisdictions [Member]
Income Taxes [Line Items]
Net operating loss carry forward		$ 8,800,000
Scenario Forecast [Member]
Income Taxes [Line Items]
U.S. federal corporate statutory tax rate	21.00%

Income Taxes - Schedule of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments [Abstract]
Domestic	$ 3,891	$ (39,623)	$ 997
Foreign	(2,482)	6,659	(4,093)
Income (loss) before income taxes	$ 1,409	$ (32,964)	$ (3,096)

Income Taxes - Schedule of Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 6,234	$ 4,957	$ 3,429
State	388	892	753
Foreign	939	3,191	1,944
Current Income Tax Expense (Benefit), Total	7,561	9,040	6,126
Deferred:
Federal	(2,479)	(2,794)	(3,012)
State	114	(409)	(563)
Foreign	(758)	(547)	87
Deferred income tax expense (benefit)	(3,123)	(3,750)	(3,488)
Income tax provision from continuing operations	$ 4,438	$ 5,290	$ 2,638

Income Taxes - Schedule of Reconciliation of Income Tax Provision and Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax expense (benefit) at statutory rate	$ 494	$ (11,525)	$ (1,083)
Increase (decrease) in tax resulting from:
State income tax, net of federal benefit	367	174	34
Domestic production activities deduction	(235)	(561)	(211)
Intangible asset and goodwill impairment	1,789	17,859
Change in uncertain tax position reserves	465	(624)	(1,281)
Permanent differences	1,026	(31)	1,162
Impact of rate differences and adjustments	(20)	(1,655)	(1,489)
United States and foreign tax incentives	(240)	(1,035)	(883)
Non-deductible transaction costs		7	1,356
Earnout (income) expense	(1,779)	2,573	3,928
Change in valuation allowance	1,044	222	483
Audit settlements			65
Provision-to-return adjustments	(495)	108	808
Revaluation of deferred tax assets and liabilities	(4,819)
Net deemed dividend on repatriation of foreign earnings	6,426
Other	415	(222)	(251)
Income tax provision from continuing operations	$ 4,438	$ 5,290	$ 2,638

Income Taxes - Schedule of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Gross deferred tax assets:
Accrued expenses and other	$ 286	$ 3
Reserves on assets	2,000	3,078
Share-based compensation awards	436	1,340
Minimum pension / post retirement	2,318	4,197
Net operating loss carry-forwards	3,471	5,932
Tax credit carry-forwards	1,634	1,634
Valuation allowances	(3,873)	(3,135)
Total Deferred Tax Assets	6,272	13,049
Gross deferred tax liabilities:
Depreciation	(448)	(614)
Goodwill and intangibles	(13,588)	(23,060)
Prepaid expenses and inventory	(585)	(785)
Revenue recognition	(1,861)	(1,554)
Total Deferred Tax Liabilities	(16,482)	(26,013)
Net deferred tax liabilities	$ (10,210)	$ (12,964)

Income Taxes - Schedule of Reconciliation of Uncertain Tax Position (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Balance as of January 1	$ 401	$ 1,024
Additions for tax positions taken in prior years	465
Statute expirations		(576)
Reductions of tax positions taken in prior years		(47)
Balance as of December 31	$ 866	$ 401

Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Common stock, shares issued	34,300,209	34,707,924	34,300,209
Rent expense		$ 4,200,000	$ 4,500,000	$ 4,000,000
Adwest Technologies, Inc. ('Adwest') [Member]
Related Party Transaction [Line Items]
Rent expense paid to former owner		$ 0
Common Stock [Member]
Related Party Transaction [Line Items]
Common stock, shares issued	89,640		89,640
Share purchased		0	105,000	0
Common Stock [Member] \| Current Segment President [Member]
Related Party Transaction [Line Items]
Share purchased	75,000		75,000
Adwest, Zhongli, and Emtrol Subsidiaries [Member]
Related Party Transaction [Line Items]
Rent expense		$ 600,000	$ 1,100,000	$ 1,100,000
Zhongli Subsidiary [Member]
Related Party Transaction [Line Items]
Purchase of inventory		800,000	800,000	300,000
Sale of inventory		100,000	0	400,000
Consulting Services [Member] \| Related Party One [Member]
Related Party Transaction [Line Items]
Rent and other expenses paid		300,000	400,000	400,000
Consulting Services [Member] \| Related Party Two [Member]
Related Party Transaction [Line Items]
Rent and other expenses paid		$ 100,000	$ 100,000	$ 300,000

Major Customers and Foreign Sales - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Major Customers [Line Items]
Sales outside Country, percentage	32.00%	37.00%	38.00%
Europe [Member]
Major Customers [Line Items]
Sales outside Country, percentage	6.00%
Long lived assets located outside Country	$ 19.6
Outside United States [Member]
Major Customers [Line Items]
Long lived assets located outside Country	$ 35.4	$ 34.8
Asia [Member]
Major Customers [Line Items]
Sales outside Country, percentage	12.00%
Long lived assets located outside Country	$ 13.6
Net Sales [Member] \| Customer Concentration Risk [Member]
Major Customers [Line Items]
Major customer	10.00%	10.00%	10.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Major Customers [Line Items]
Major customer	10.00%	10.00%	10.00%

Acquisitions - (PMFG) - Additional Information (Detail) - PMFG, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 03, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 11, 2016
Business Acquisition [Line Items]
Equity interests acquired	100.00%
Purchase price of acquisition	$ 136,700
Cash consideration per share	$ 6.85	$ 9.49
Stock consideration per share	$ 6.85
Trading day period	15 days
Percentage of common stock converted into cash	44.50%
Value of shares transferred for cash	$ 64,600
Trading price	$ 9.6655
Exchange ratio	0.6456
Shares of common stock in aggregate stock consideration	7,602,166
Percentage of cash consideration		58.05%
Percentage of stock consideration		41.95%
Value of stock recorded for purchase accounting		$ 72,100
Fair value of noncontrolling interest			$ 4,212
Revenue from acquired entity		89,400	101,700	$ 40,800
Income from acquired entity		$ 6,700	13,100	$ 2,200
Peerless Propulsys [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		60.00%
Percentage of ownership by parent in net income loss		80.00%
Promissory note issued in exchange for ownership in equity			$ 5,300
Promissory note due date			Jul. 11, 2019
Ownership interest in the equity and earnings			100.00%
Business combination acquisition of minority interest caring value					$ 4,100
Fair value of noncontrolling interest					$ 5,300
Additional paid in capital noncontrolling interest excess payment for existing equity investment			$ 1,200
Notes payable amount outstanding		$ 5,300
Debt Instrument, Term		30 days
Notes payable description		As of December 31, 2017, $5.3 million of the note payable was outstanding and is payable at the earlier of July 11, 2019 or thirty days subsequent to the sale of building and land that the Company owns in China.
Asset held for sale, carrying value		$ 5,400
Interest rate		1.50%
Maximum [Member]
Business Acquisition [Line Items]
Common stock shares exchange ratio per share	0.6456
Minimum [Member]
Business Acquisition [Line Items]
Common stock shares exchange ratio per share	0.5282

Acquisitions - Fair Values of Assets and Liabilities Assumed at Date of Closing after Company Finalized Purchase Accounting - PMFG (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 166,951	$ 170,153	$ 220,163
PMFG, Inc. [Member]
Business Acquisition [Line Items]
Current assets (including cash of $27,100)		92,293
Property and equipment		24,787
Other assets		953
Assets held for sale		950
Goodwill		59,860
Intangible – finite life		29,940
Intangible – indefinite life		10,280
Total assets acquired		219,063
Current liabilities assumed		(73,364)
Deferred income tax liability		(800)
Long term liabilities assumed		(3,961)
Noncontrolling interest		(4,212)
Net assets acquired		$ 136,726

Acquisitions - Fair Values of Assets and Liabilities Assumed at Date of Closing after Company Finalized Purchase Accounting - PMFG (Parenthetical) (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
PMFG, Inc. [Member]
Business Acquisition [Line Items]
Cash	$ 27,100

Acquisitions - Information of Company's Results of Operations (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares
Business Acquisition Pro Forma Information [Abstract]
Net sales \| $	$ 460,726
Net loss \| $	$ (29,568)
Earnings per share:
Basic \| $ / shares	$ (0.87)
Diluted \| $ / shares	$ (0.87)

Acquisitions - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Business Combination Description [Abstract]
Acquisition related expenses included in pro-forma results	$ 17.7
Nonrecurring expenses included in pro-forma results	$ 3.7

Business Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 Segment
CECO Group, Inc. [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	3

Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 73,543	$ 84,987	$ 93,870	$ 92,651	$ 99,982	$ 101,596	$ 112,258	$ 103,175	$ 345,051	$ 417,011	$ 367,422
Income (loss) from Operations									8,024	(25,562)	4,949
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									127,279	153,344	158,371
Income (loss) from Operations									13,703	15,652	17,021
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									149,514	203,376	142,150
Income (loss) from Operations									8,987	23,575	3,488
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									69,159	61,783	67,610
Income (loss) from Operations									14,734	(36,209)	11,741
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales									(901)	(1,492)	(709)
Income (loss) from Operations									(26,649)	(26,981)	(26,592)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income (loss) from Operations									$ (2,751)	$ (1,599)	$ (709)

Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property and equipment additions	$ 1,028	$ 5,461	$ 763
Depreciation and amortization	16,088	18,903	16,520
Identifiable assets	438,549	498,634
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	166	404	166
Depreciation and amortization	3,297	3,816	4,443
Identifiable assets	107,910	118,680
Energy Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	438	569	429
Depreciation and amortization	7,866	9,555	5,293
Identifiable assets	217,033	257,566
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	382	4,481	150
Depreciation and amortization	4,754	5,406	6,331
Identifiable assets	100,916	104,294
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	42	7	18
Depreciation and amortization	171	126	$ 453
Identifiable assets	$ 12,690	$ 18,094

Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Non-cash additions for property, plant and equipment acquired under capital leases	$ 4,385
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Non-cash additions for property, plant and equipment acquired under capital leases	$ 4,385

Business Segment Information - Goodwill (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill
Goodwill	$ 166,951	$ 170,153	$ 220,163
Environmental Segment [Member]
Goodwill
Goodwill	48,203	48,203	55,031
Energy Segment [Member]
Goodwill
Goodwill	72,625	75,827	72,075
Fluid Handling and Filtration Segment [Member]
Goodwill
Goodwill	$ 46,123	$ 46,123	$ 93,057

Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 73,543	$ 84,987	$ 93,870	$ 92,651	$ 99,982	$ 101,596	$ 112,258	$ 103,175	$ 345,051	$ 417,011	$ 367,422
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									127,279	153,344	158,371
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									149,514	203,376	142,150
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									69,159	61,783	67,610
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales									(901)	(1,492)	(709)
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(15,238)	(9,476)	(13,897)
Intra - Segment Sales [Member] \| Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									(3,235)	(4,256)	(6,744)
Intra - Segment Sales [Member] \| Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									(8,834)	(3,506)	(4,876)
Intra - Segment Sales [Member] \| Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									(3,169)	(1,714)	(2,277)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									363,464	432,566	384,992
Operating Segments [Member] \| Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									131,356	160,959	167,247
Operating Segments [Member] \| Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									158,456	207,280	147,661
Operating Segments [Member] \| Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									73,652	64,327	70,084
Inter-segment Elimination [Member] \| Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(601)	(715)	(832)
Inter-segment Elimination [Member] \| Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(1,619)	(3,666)	(1,937)
Inter-segment Elimination [Member] \| Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(55)	(206)	(195)
Inter-segment Elimination [Member] \| Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(901)	(1,492)	(709)
Inter-segment Elimination [Member] \| Environmental Segment [Member] \| Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(787)	(3,153)	(1,937)
Inter-segment Elimination [Member] \| Environmental Segment [Member] \| Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(55)	(206)	(195)
Inter-segment Elimination [Member] \| Energy Segment [Member] \| Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(108)	(398)	(635)
Inter-segment Elimination [Member] \| Fluid Handling and Filtration Segment [Member] \| Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(493)	(317)	(197)
Inter-segment Elimination [Member] \| Fluid Handling and Filtration Segment [Member] \| Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(832)	(513)
Inter-segment Elimination [Member] \| Corporate and Other [Member] \| Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									$ (901)	$ (1,492)	$ (709)

Quarterly Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 73,543	$ 84,987	$ 93,870	$ 92,651	$ 99,982	$ 101,596	$ 112,258	$ 103,175	$ 345,051	$ 417,011	$ 367,422
Gross profit	25,646	27,133	28,486	31,929	35,667	33,676	33,930	31,586	113,194	134,859	109,171
Net income (loss)	(11,589)	3,036	5,486	38	(51,172)	5,826	4,037	3,055	$ (3,029)	$ (38,218)	$ (5,602)
Net income (loss) attributable to CECO Environmental Corp.	$ (11,589)	$ 3,036	$ 5,486	$ 38	$ (51,172)	$ 5,804	$ 4,050	$ 3,100
Basic earnings (loss) per share	$ (0.34)	$ 0.09	$ 0.16	$ 0.00	$ (1.49)	$ 0.17	$ 0.12	$ 0.09	$ (0.09)	$ (1.12)	$ (0.19)
Diluted earnings (loss) per share	$ (0.34)	$ 0.09	$ 0.16	$ 0.00	$ (1.49)	$ 0.17	$ 0.12	$ 0.09	$ (0.09)	$ (1.12)	$ (0.19)