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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	CECE
Entity Registrant Name	CECO ENVIRONMENTAL CORP
Entity Central Index Key	0000003197
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		35,051,760

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 28,167	$ 43,676
Restricted cash	738	762
Accounts receivable, net	72,963	53,225
Costs and estimated earnings in excess of billings on uncompleted contracts	31,701	29,694
Inventories, net	19,780	20,817
Prepaid expenses and other current assets	10,439	10,117
Prepaid income taxes		1,388
Assets held for sale	1,170	1,186
Total current assets	164,958	160,865
Property, plant and equipment, net	11,650	22,200
Right-of-use assets from operating leases	13,260
Goodwill	152,066	152,156
Intangible assets – finite life, net	37,633	35,959
Intangible assets – indefinite life	14,314	18,258
Deferred charges and other assets	2,788	3,144
Total assets	396,669	392,582
Current liabilities:
Accounts payable and accrued expenses	79,201	80,229
Billings in excess of costs and estimated earnings on uncompleted contracts	23,596	20,144
Note payable		1,700
Income taxes payable	1,137	1,813
Total current liabilities	103,934	103,886
Other liabilities	22,572	26,925
Debt	74,725	74,456
Deferred income tax liability, net	7,226	8,755
Operating lease liabilities (Note 12)	10,822
Total liabilities	219,279	214,022
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, 34,979,895 and 34,953,825 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	349	349
Capital in excess of par value	252,199	251,409
Accumulated loss	(62,165)	(59,427)
Accumulated other comprehensive loss	(12,637)	(13,415)
Stockholders' equity before treasury stock	177,746	178,916
Less treasury stock, at cost, 137,920 shares at March 31, 2019 and December 31, 2018	(356)	(356)
Total shareholders’ equity	177,390	178,560
Total liabilities and shareholders' equity	$ 396,669	$ 392,582

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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	34,979,895	34,953,825
Common Stock, shares outstanding	34,979,895	34,953,825
Treasury stock, shares	137,920	137,920

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 86,011	$ 74,139
Cost of sales	57,579	48,578
Gross profit	28,432	25,561
Selling and administrative expenses	21,312	21,573
Amortization and earnout expenses	2,160	2,903
Loss (gain) on divestitures, net of selling costs	70	(11,177)
Restructuring expenses		112
Income from operations	4,890	12,150
Other expense, net	(640)	(356)
Interest expense	(1,544)	(1,920)
Income before income taxes	2,706	9,874
Income tax expense	842	4,111
Net income	$ 1,864	$ 5,763
Earnings per share:
Basic	$ 0.05	$ 0.17
Diluted	$ 0.05	$ 0.17
Weighted average number of common shares outstanding:
Basic	34,835,550	34,592,803
Diluted	35,360,042	34,641,390

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,864	$ 5,763
Other comprehensive income (loss), net of tax:
Interest rate swap	(213)	193
Foreign currency translation	979	2,010
Comprehensive income	$ 2,630	$ 7,966

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Loss [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017	$ 186,569	$ 347	$ 248,170	$ (52,673)	$ (8,919)	$ (356)
Beginning Balance, Shares at Dec. 31, 2017		34,708,000				(138,000)
Net income	5,763			5,763
Cumulative effect adjustment \| ASU 2018-02 and ASU 2014-09 [Member]	(652)			415	(1,067)
Exercise of stock options	$ 4		4
Exercise of stock options, Shares	2,000	2,000
Restricted stock units issued	$ (22)		(22)
Restricted stock units issued, Shares		12,000
Share based compensation earned	708		708
Share based compensation earned, Shares		19,000
Adjustment for interest rate swap	193				193
Translation gain	2,010				2,010
Ending Balance at Mar. 31, 2018	194,573	$ 347	248,860	(46,495)	(7,783)	$ (356)
Ending Balance, Shares at Mar. 31, 2018		34,741,000				(138,000)
Beginning Balance at Dec. 31, 2018	178,560	$ 349	251,409	(59,427)	(13,415)	$ (356)
Beginning Balance, Shares at Dec. 31, 2018		34,954,000				(138,000)
Net income	1,864			1,864
Cumulative effect adjustment \| ASU 2017-12 and ASU 2016-02 [Member]	$ (4,590)			(4,602)	12
Exercise of stock options, Shares	0
Restricted stock units issued	$ (8)		(8)
Restricted stock units issued, Shares		12,000
Share based compensation earned	798		798
Share based compensation earned, Shares		14,000
Adjustment for interest rate swap	(213)				(213)
Translation gain	979				979
Ending Balance at Mar. 31, 2019	$ 177,390	$ 349	$ 252,199	$ (62,165)	$ (12,637)	$ (356)
Ending Balance, Shares at Mar. 31, 2019		34,980,000				(138,000)

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 1,864	$ 5,763
Adjustment to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	2,771	3,497
Unrealized foreign currency loss (gain)	561	(199)
Net gain on interest rate swaps	(44)	(53)
Earnout payments		(247)
Gain on sale of property and equipment		(9)
Loss (gain) on divestitures, net of selling costs	70	(11,177)
Debt discount amortization	269	291
Share-based compensation expense	798	626
Bad debt expense	137	146
Inventory reserve expense	217	296
Deferred income tax benefit		(1,215)
Changes in operating assets and liabilities, net of divestitures:
Accounts receivable	(19,627)	(412)
Costs and estimated earnings in excess of billings on uncompleted contracts	(1,607)	(2,662)
Inventories	821	(739)
Prepaid expense and other current assets	1,187	1,494
Deferred charges and other assets	41	258
Accounts payable and accrued expenses	(3,938)	6,989
Billings in excess of costs and estimated earnings on uncompleted contracts	3,443	(2,227)
Income taxes payable	(719)	3,043
Other liabilities	15	(215)
Net cash (used in) provided by operating activities	(13,741)	3,248
Cash flows from investing activities:
Acquisitions of property and equipment	(423)	(466)
Net cash proceeds from divestitures		30,692
Proceeds from sale of property and equipment		112
Net cash (used in) provided by investing activities	(423)	30,338
Cash flows from financing activities:
Net repayments on revolving credit lines		(2,336)
Repayments of debt	(1,700)	(28,156)
Payments on finance leases and financing liability	(116)	(171)
Proceeds from employee stock purchase plan, exercise of stock options, and dividend reinvestment plan		64
Net cash used in financing activities	(1,816)	(30,599)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	447	376
Net (decrease) increase in cash, cash equivalents and restricted cash	(15,533)	3,363
Cash, cash equivalents and restricted cash at beginning of period	44,438	30,659	$ 30,659
Cash, cash equivalents and restricted cash at end of period	28,905	34,022	$ 44,438
Cash paid during the period for:
Interest	1,514	1,456
Income taxes	$ 237	594
Non-cash transaction:
Net consideration receivable from divestiture		$ 1,979

Basis of Reporting for Consolidated Financial Statements

3 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Reporting for Consolidated Financial Statements

The accompanying unaudited condensed consolidated financial statements of CECO Environmental Corp. and its subsidiaries (the “Company”, “we”, “us”, or “our”) have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in annual financial statements have been condensed or omitted pursuant to those rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements of the Company contain all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the financial position as of March 31, 2019 and the results of operations, cash flows and shareholders’ equity for the three-month periods ended March 31, 2019 and 2018. The results of operations for the three-month periods ended March 31, 2019 are not necessarily indicative of the results to be expected for the full year. The balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 as filed with the SEC.

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.

These financial statements and accompanying notes should be read in conjunction with the audited financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC.

Unless otherwise indicated, all balances within tables are in thousands, except per share amounts.

New Financial Accounting Pronouncements

3 Months Ended

Mar. 31, 2019

Accounting Changes And Error Corrections [Abstract]

New Financial Accounting Pronouncements

Accounting Standards adopted in Fiscal 2019

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases,” which, together with its related clarifying ASUs, provides revised guidance for lease accounting and related disclosure requirements and 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. Under the guidance, leases are classified as either finance or operating, with classification affecting the pattern of expense recognition. We adopted ASU 2016-02 effective January 1, 2019, using the modified retrospective method which was applied to leases that existed or were entered into on or after January 1, 2019. The Company elected to utilize the package of practical expedients that allows us to 1) not reassess whether any expired or existing contracts are or contain leases, 2) retain the existing classification of lease contracts as of the date of adoption, and 3) not reassess initial direct costs for any existing leases. We also elected to not separate lease and non-lease components, for all leases. The adoption of this standard had a material impact on our consolidated balance sheet due to the recognition of ROU assets and liabilities for our operating leases totaling $13.3 million, as well as an adjustment to beginning equity of $4.6 million, net of tax, related to prior sales lease back transaction. The adoption of the standard did not have a material impact on our statement of income or liquidity. See Note 12 – Leases for disclosures related to the amended guidance.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” This guidance expands an entity’s ability to apply hedge accounting for nonfinancial and financial risk components and allows for a simplified approach for fair value hedging of interest rate risk. Additionally, this ASU 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. The Company adopted this ASU on January 1, 2019 and applied the modified retrospective approach through a cumulative-effect adjustment from accumulated other comprehensive income (“AOCI”) to retained earnings as of the effective date. The impact of the adoption of this ASU was not material.

Accounting Standards Yet to be Adopted

In August 2018, the FASB issued ASU 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans,” that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The new guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and requires new ones that the FASB considers pertinent. ASU 2018-14 is effective for the Company January 1, 2021. The Company is evaluating the impact of the adoption of ASU 2018-14 on its consolidated financial statements.

Accounts Receivable

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Accounts Receivable

3.	Accounts Receivable

(table only in thousands)	March 31, 2019			December 31, 2018
Contract receivables	$	65,453		$	48,826
Trade receivables		10,435			7,296
Allowance for doubtful accounts		(2,925	)		(2,897	)
Total accounts receivable	$	72,963		$	53,225

Balances billed but not paid by customers under retainage provisions in contracts within the Condensed Consolidated Balance Sheets amounted to approximately $0.9 million at March 31, 2019 and December 31, 2018. Retainage receivables on contracts in progress are generally collected within a year after contract completion.

Bad debt expense was $0.1 million for the three-month periods ended March 31, 2019 and 2018.

- 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

3 Months Ended

Mar. 31, 2019

Text Block [Abstract]

Costs and Estimated Earnings on Uncompleted Contracts

4.	Costs and Estimated Earnings on Uncompleted Contracts

Our contracts have various lengths to completion ranging from a few days to several months. We anticipate that a majority of our current contracts will be completed within the next twelve months. A significant amount of our revenue within the Energy Solutions and Industrial Solutions segments is recognized over a period of time as we perform under the contract because control of the work in process transfers continuously to the customer. The assets and liabilities recognized in association with these contracts are as follows:

(table only in thousands)	March 31, 2019			December 31, 2018
Costs incurred on uncompleted contracts	$	193,393		$	174,168
Estimated earnings		76,693			67,427
Total costs and estimated earnings on uncompleted contracts, gross		270,086			241,595
Less billings to date		(261,981	)		(232,045	)
Total costs and estimated earnings on uncompleted contracts, net	$	8,105		$	9,550
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	$	31,701		$	29,694
Billings in excess of costs and estimated earnings on uncompleted contracts		(23,596	)		(20,144	)
Total costs and estimated earnings on uncompleted contracts, net	$	8,105		$	9,550

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 as of March 31, 2019 or December 31, 2018.

Inventories

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

5.	Inventories

(table only in thousands)	March 31, 2019			December 31, 2018
Raw materials	$	15,867		$	15,819
Work in process		5,392			6,098
Finished goods		748			807
Obsolescence allowance		(2,227	)		(1,907	)
Total inventories	$	19,780		$	20,817

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.2 million and $0.3 million for the three-month periods ended March 31, 2019 and 2018, respectively.

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

6.	Goodwill and Intangible Assets

(table only in thousands)	Three months ended March 31, 2019						Year ended December 31, 2018
Goodwill / Tradenames	Goodwill			Tradenames			Goodwill			Tradenames
Beginning balance	$	152,156		$	18,258		$	166,951		$	19,691
Transfers to finite life classification		—			(3,904	)		—			—
Divestitures		—			—			(14,317	)		(1,340	)
Foreign currency translation		(90	)		(40	)		(478	)		(93	)
	$	152,066		$	14,314		$	152,156		$	18,258

(table only in thousands)	As of March 31, 2019					As of December 31, 2018
Intangible assets – finite life	Cost			Accum. Amort.		Cost			Accum. Amort.
Technology	$	14,457		$	9,674	$	14,457		$	9,414
Customer lists		68,943			39,611		68,943			37,873
Noncompetition agreements		910			799		910			762
Tradename		5,294			712		1,390			579
Foreign currency adjustments		(1,554	)		(379)		(1,520	)		(407	)
	$	88,050		$	50,417	$	84,180		$	48,221

Activity for the three-months ended March 31, 2019 and 2018 is as follows:

(table only in thousands)	2019			2018
Intangible assets – finite life, net at beginning of period	$	35,959		$	49,956
Amortization expense		(2,160	)		(2,555	)
Divestitures		—			(2,372	)
Transfers from indefinite life classification		3,904			—
Foreign currency adjustments		(70	)		259
Intangible assets – finite life, net at end of period	$	37,633		$	45,288

Amortization expense of finite life intangible assets was $2.2 million and $2.6 million for the three-month periods ended March 31, 2019 and 2018, respectively. Amortization over the next five years for finite life intangibles is expected to be $6.3 million for the remainder of 2019, $6.8 million in 2020, $5.7 million in 2021, $4.8 million in 2022, and $4.0 million in 2023.

During the three-month period ended March 31, 2019, the Company reassessed the useful lives of certain tradenames and determined that $3.9 million of their tradenames would have useful lives of 10 years now versus indefinite. The Company did not identify any triggering events during the three-month period ended March 31, 2019 that would require an interim impairment assessment of goodwill or intangible assets.

Accounts Payable and Accrued Expenses

3 Months Ended

Mar. 31, 2019

Payables And Accruals [Abstract]

Accounts Payable and Accrued Expenses

7.	Accounts Payable and Accrued Expenses

(table only in thousands)	March 31, 2019		December 31, 2018
Trade accounts payable, including due to subcontractors	$	53,315	$	51,984
Compensation and related benefits		5,375		7,578
Short-term lease liabilities		2,939		—
Accrued warranty		3,509		3,384
Contract liabilities		5,982		6,541
Other accrued expenses		8,081		10,742
Total accounts payable and accrued expenses	$	79,201	$	80,229

Senior Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Senior Debt

8.	Senior debt

Debt consisted of the following at March 31, 2019 and December 31, 2018:

(table only in thousands)	March 31, 2019			December 31, 2018
Outstanding borrowings under Credit Facility (defined below). Term loan balance due upon maturity in September 2020.
- Term loan	$	76,147		$	76,147
- U.S. Dollar revolving loans		—			—
- Unamortized debt discount		(1,422	)		(1,691	)
Total outstanding borrowings under Credit Facility	$	74,725		$	74,456

During the three-month period ended March 31, 2019, the Company made no payments on the outstanding balance of the term loan. Due to the additional prepayments made in 2018, there are no payments due on the term loan until the final scheduled principal payment of $76.1 million, in September 2020.

United States Debt

As of March 31, 2019 and December 31, 2018, $27.4 million and $29.3 million of letters of credit were outstanding, respectively. Total unused credit availability under the Company’s senior secured term loan, senior secured U.S. dollar revolving loans with sub-facilities for letters of credit and swing-line loans and senior secured multi-currency revolving credit facility for U.S. dollar and specific foreign currency loans (collectively, the “Credit Facility”) was $52.6 million and $50.7 million at March 31, 2019 and December 31, 2018, respectively. Revolving loans may be borrowed, repaid and reborrowed until September 3, 2020, at which time all outstanding balances of the Credit Facility must be repaid.

The weighted average stated interest rate on outstanding borrowings was 5.25% and 5.27% at March 31, 2019 and December 31, 2018, respectively.

In accordance with the Credit Facility terms, the Company entered into an interest rate swap to hedge against interest rate exposure related to a portion of the outstanding debt indexed to LIBOR market rates. The fair value of the interest rate swap was an asset of $0.3 million and $0.5 million as of March 31, 2019 and December 31, 2018, respectively, and is classified within the “Deferred charges and other assets” on the Condensed Consolidated Balance Sheets. The Company designated the interest rate swap as an effective hedge; therefore, the changes to the fair value of the interest rate swap have been recorded in other comprehensive income as the hedge is deemed effective.

Under the terms of the Credit Facility, the Company is required to maintain certain financial covenants, including the maintenance of a Consolidated Leverage Ratio as well as restricting the amount of capital expenditures the Company may make in 2019. Through March 31, 2019, the maximum Consolidated Leverage Ratio is 3.75, after which time it will decrease to 3.50 through September 30, 2019. The Consolidated Leverage Ratio will then decrease to 3.25 until the end of the term of the Credit Facility.

As of March 31, 2019 and December 31, 2018, the Company was in compliance with all related financial and other restrictive covenants under the Credit Facility.

Foreign Debt

The Company has a number of facilities and bilateral agreements in various countries currently supported by letters of credit issued under the Credit Facility. In addition, a subsidiary of the Company located in the Netherlands has a Euro-denominated bank guarantee agreement, under which $3.1 million in bank guarantees were outstanding as of March 31,2019. As of March 31, 2019, the borrowers of these facilities and agreements were in compliance with all related financial and other restrictive covenants.

Earnings and Dividends per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Earnings and Dividends per Share

9.	Earnings and Dividends per Share

The computational components of basic and diluted earnings per share for the three-month periods ended March 31, 2019 and 2018 are below.

	For the three month period ended March 31,
	2019		2018
(Table only in thousands) Numerator (for basic and diluted earnings per share)
Net income	$	1,864	$	5,763

Denominator
Basic weighted-average shares outstanding		34,836		34,593
Common stock equivalents arising from stock options and restricted stock awards		524		48
Diluted weighted-average shares outstanding		35,360		34,641

Options and restricted stock units included in the computation of diluted earnings per share are calculated using the treasury stock method. For the three-month periods ended March 31, 2019 and 2018, 0.5 million and 0.6 million respectively, of outstanding options and restricted stock units were excluded from the computation of diluted earnings per share due to their having an anti-dilutive effect.

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

Share-Based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

10.	Share-Based Compensation

The Company accounts for share-based compensation in accordance with Accounting Standards Codification (“ASC”) Topic 718, “Compensation – Stock Compensation,” which requires the Company to recognize compensation expense for share-based awards, measured at the fair value of the awards at the grant date. The Company recognized $0.8 million and $0.6 million of share compensation related expense during the three-month periods ended March 31, 2019 and 2018, respectively.

The Company granted zero options during the three-month periods ended March 31, 2019 and 2018, respectively.

The Company granted approximately 400,000 and 20,000 restricted stock units during the three-month periods ended March 31, 2019 and 2018, respectively. The weighted-average fair value of restricted stock units was estimated at $7.24 and $4.27 per unit granted during the three-months ended March 31, 2019 and 2018, respectively. The fair value of the restricted stock units was determined by using the value of stock in the open market on the date of grant.

The fair value of the stock-based awards granted is recorded as compensation expense on a straight-line basis over the vesting periods of the awards.

There were zero and approximately 2,000 options exercised during the three-months ended March 31, 2019 and 2018, respectively. The Company received zero and $4,000 in cash from employees exercising options during the three-months ended March 31, 2019 and 2018. The intrinsic value of options exercised during the three-months ended March 31, 2019 and 2018 was zero and $6,000, respectively.

Pension and Employee Benefit Plans

3 Months Ended

Mar. 31, 2019

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 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 allowed retirees who attained the age of 65 to elect the type of coverage desired.

We present service cost within cost of sales and selling and administrative expenses depending on where the relevant employees compensation costs are recorded, and we present other components of net periodic benefit cost (gain) within other expense, net on the Condensed Consolidated Statements of Income.

Retirement and health care plan expense is based on valuations performed by plan actuaries as of the beginning of each fiscal year. The components of the expense consisted of the following:

	Three Months Ended March 31,
(table only in thousands)	2019			2018
Pension plan:
Service cost	$	—		$	97
Interest cost		326			298
Expected return on plan assets		(313	)		(476	)
Amortization of net actuarial loss		65			59
Net periodic benefit cost (gain)	$	78		$	(22	)
Health care plan:
Interest cost	$	1		$	1
Amortization of loss		2			2
Net periodic benefit cost	$	3		$	3

We made contributions to our defined benefit plans during the three-months ended March 31, 2019 and 2018 totaling $0.1 million and $0.2 million, respectively. We anticipate $0.4 million and $24,000 of further contributions to fund the pension plan and the retiree health care plan, respectively, during the remainder of 2019. The unfunded liability of the plans of $8.8 million as of March 31, 2019 and December 31, 2018 is included in Other liabilities on our Condensed Consolidated Balance Sheets.

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

12.

Leases

Our leasing activity is primarily related to buildings used for manufacturing, warehousing, sales, and administrative activities. We determine if an arrangement is a lease at inception. Many of our lease agreements contain renewal options; however, we do not recognize right-of-use assets or lease liabilities for renewal periods unless it is determined that we are reasonably certain of renewing the lease at inception or when a triggering event occurs. Some of our lease agreements contain rent escalation clauses, free-rent periods, or other lease concessions. We recognize our minimum rental expense on a straight-line basis based on the fixed components of a lease arrangement. Variable lease costs represent amounts that are not fixed in nature and are not tied to an index or rate, and are recognized as incurred. Our variable lease costs are not material.

In determining our right-of-use assets and lease liabilities, we apply a discount rate to the minimum lease payments within each lease agreement. ASU 2016-02 requires us to use the rate of interest that a lessee would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. When we cannot readily determine the discount rate implicit in the lease agreement, we utilize our incremental borrowing rate. To estimate our specific incremental borrowing rates we consider, among other factors, interest rates on our existing credit facilities, risk-free rates, the types of assets being leased, and the term of the leases.

The components of lease expense were as follows:

(table only in thousands)	For the Three Months Ended March 31, 2019
Operating lease cost (a)	$	913
Finance lease cost:
Amortization of right-of-use assets		77
Interest on lease liability		92
Total finance lease cost		169
Total lease cost	$	1,082
(a) includes variable lease costs which are immaterial

Supplemental cash flow information related to leases was as follows:

(table only in thousands)	For the Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	871
Operating cash flows from finance leases	$	92
Financing cash flows from finance leases	$	116
Right of use assets obtained in exchange for lease obligations
Operating leases	$	1,039

Supplemental balance sheet information related to leases was as follows:

(table only in thousands)	March 31, 2019
Operating leases
Right-of-use assets from operating leases	$	13,260

Accounts payable and accrued expenses	$	2,452
Operating lease liabilities		10,822
Total operating lease liabilities	$	13,274

Finance leases
Property, plant and equipment, net	$	3,462

Accounts payable and accrued expenses	$	487
Other liabilities		7,731
Total finance lease liabilities	$	8,218

Weighted-average remaining lease term
Operating leases		9 years
Finance leases		12 years
Weighted-average discount rate
Operating leases		5.4%
Finance leases		4.5%

As of March 31, 2019, maturities of lease liabilities were as follows:

(table only in thousands)	Operating Leases			Finance Leases
2019	$	2,532		$	632
2020		2,477			855
2021		2,061			872
2022		1,452			889
2023		1,359			907
Thereafter		6,034			6,409
Total minimum lease payments	$	15,915		$	10,564
Less imputed interest		(2,641	)		(2,346	)
Lease liability	$	13,274		$	8,218

As previously disclosed in our 2018 Annual Report on Form 10-K and under previous lease accounting standards, future minimum lease payments for operating leases having initial or remaining noncancellable lease terms in excess of one year would have been as follows:

(table only in thousands)	December 31, 2018
2019	$	2,745
2020		1,880
2021		1,454
2022		931
2023		851
Thereafter		2,278
Total	$	10,139

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

13.	Income Taxes

We file income tax returns in various federal, state and local jurisdictions. Tax years from 2014 forward remain open for examination by Federal authorities. Tax years from 2013 forward remain open for all significant state and foreign authorities.

We account for uncertain tax positions pursuant to ASC Topic 740, “Income Taxes.” As of March 31, 2019 and December 31, 2018, the liability for uncertain tax positions totaled approximately $1.0 million and $0.9 million, respectively, which is included in Other liabilities on our Condensed Consolidated Balance Sheets. We recognize accrued interest related to uncertain tax positions and penalties, if any, in income tax expense within the Condensed Consolidated Statements of Income.

Certain of the Company’s undistributed earnings of our foreign subsidiaries are not permanently reinvested. Since foreign earnings have already been subject to U.S. income tax in 2017 as a result of the 2017 Tax Cuts and Jobs Act (the “Tax Act”), we intend to repatriate foreign-held cash as needed. As of March 31, 2019 and December 31, 2018, we have recorded deferred income taxes of approximately $0.6 million on the undistributed earnings of our foreign subsidiaries. This amount is attributable primarily to the foreign withholding taxes that would become payable should we decide to repatriate cash held in our foreign operations.

Income tax expense was $0.8 million for the first quarter of 2019, compared with income tax expense of $4.1 million for the first quarter of 2018. The effective income tax rate for the first quarter of 2019 was 31.1%, compared with 41.6% for first quarter of 2018. The effective income tax rate for the first quarter of 2019 is higher than the U.S. federal statutory rate of 21% due to state income taxes and unrecognized tax losses in certain foreign jurisdictions. The comparable period effective tax rate was higher than the U.S. federal statutory rate most significantly due to a permanent book-tax difference related to the accounting treatment of goodwill on 2018 divestitures. Our effective tax rate is affected by certain other permanent differences, including state income taxes, non-deductible incentive stock-based compensation, the Global Intangible Low-Taxed Income inclusion and Foreign-Derived Intangible Income deduction, tax credits, and differences in tax rates among the jurisdictions in which we operate.

Financial Instruments

3 Months Ended

Mar. 31, 2019

Investments All Other Investments [Abstract]

Financial Instruments

14.	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 March 31, 2019 and December 31, 2018, due to their short-term nature or variable, market-driven interest rates.

The fair value of the debt issued under the Credit Facility was $76.1 million at March 31, 2019 and December 31, 2018, respectively. The fair value of the note payable was $1.7 million at December 31, 2018.

In accordance with the terms of the Credit Facility, 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 8 for further information regarding the interest rate swap.

At March 31, 2019 and December 31, 2018, the Company had cash and cash equivalents of $28.2 million and $43.7 million, respectively, of which $25.4 million and $23.3 million, respectively, was held outside of the United States, principally in the Netherlands, United Kingdom, China, and Canada.

Commitments and Contingencies - Legal Matters

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies - Legal Matters

15.	Commitments and Contingencies – Legal Matters

Asbestos cases

Our subsidiary, Met-Pro Technologies LLC (“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 March 31, 2019 for cases involving asbestos-related claims were $2.9 million, of which, together with all legal fees other than corporate counsel expenses, $2.8 million has been paid by the Company’s insurers. The average cost per settled claim, excluding legal fees, was approximately $35,000.

Based upon the most recent information available to the Company regarding such claims, there were a total of 191 cases pending against the Company as of March 31, 2019 (with Illinois, New York, Pennsylvania and West Virginia having the largest number of cases), as compared with 208 cases that were pending as of December 31, 2018. During the three-months ended March 31, 2019, nine new cases were filed against the Company, and the Company was dismissed from 21 cases and settled five 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 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.

Summary

The Company is also a party to routine contract and employment-related litigation matters, warranty claims 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 accruals 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 any 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.

Business Segment Information

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Business Segment Information

16.	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 Income.

During the first quarter of 2019, as a result of further evaluating the Company’s operating structure, management determined that a realignment of the Company’s segments with current customer solutions we provide and end markets we serve would help maximize growth and improve customer experience. As a result of this minor realignment, the operating results of the reportable segments Fluid Handling Solutions and Industrial Solutions have been reclassified to have their results align for the three-month periods ended March 31, 2019 and 2018.

The Company’s reportable segments are organized as groups of similar products and services, as described as follows:

Energy Solutions segment: Our Energy Solutions segment serves the Energy market, where we are a key part of helping meet the global demand for Clean Energy with products and services that support our customers with efficient solutions and technologies to keep the world clean and safe. Our offerings improve air quality and solves fluid handling needs with market leading, highly engineered, and customized solutions for the power generation, oil & gas, and petrochemical industries.

Industrial Solutions segment: Our Industrial Solutions segment serves the Industrial Pollution Control market where our aim is to address the growing need to protect the air we breathe and help our customers’ desires for sustainability upgrades beyond carbon footprint issues. Our offerings improve air quality with a compelling solution set of air pollution control technologies that enable our customers to reduce their carbon footprint, lower energy consumption, minimize waste and meet compliance targets for toxic emissions, fumes, volatile organic compounds, and industrial odors.

Fluid Handling Solutions segment: Our Fluid Handling Solutions segment offers unique pump and filtration solutions that maintain safe and clean operations in some of the most harsh and toxic environments. In this market, we provide solutions for mission-critical applications to a wide variety of industries including, but not limited to, plating and metal finishing, food and beverage, chemical, petrochemical, pharmaceutical, wastewater treatment, desalination and the aquarium & aquaculture markets.

The financial segment information is presented in the following tables:

	Three Months Ended March 31,
(dollars in thousands)	2019		2018
Net Sales (less intra-, inter-segment sales)
Energy Solutions Segment	$	55,188	$	39,973
Industrial Solutions Segment		18,853		18,448
Fluid Handling Solutions Segment		11,970		15,556
Corporate and Other⁽¹⁾		—		162
Net sales	$	86,011	$	74,139

⁽¹⁾	Includes adjustment for revenue on intercompany jobs.

	Three Months Ended March 31,
(dollars in thousands)	2019			2018
Income from Operations
Energy Solutions Segment	$	9,291		$	3,624
Industrial Solutions Segment		602			1,198
Fluid Handling Solutions Segment		2,358			3,381
Corporate and Other⁽²⁾		(7,361	)		4,533
Eliminations		—			(586	)
Income from operations	$	4,890		$	12,150

⁽²⁾

Includes gain (loss) on divestitures, net of selling costs (see Note 17 – Divestitures), corporate compensation, professional services, information technology, and other general and administrative corporate expenses. This figure excludes earnout expenses, which are recorded in the segment in which the expense occurs.

	Three Months Ended March 31,
(dollars in thousands)	2019		2018
Property and Equipment Additions
Energy Solutions Segment	$	50	$	18
Industrial Solutions Segment		61		75
Fluid Handling Solutions Segment		152		273
Corporate and Other		160		100
Property and equipment additions	$	423	$	466

	Three Months Ended March 31,
(dollars in thousands)	2019		2018
Depreciation and Amortization
Energy Solutions Segment	$	1,580	$	2,158
Industrial Solutions Segment		334		286
Fluid Handling Solutions Segment		738		990
Corporate and Other		119		63
Depreciation and amortization	$	2,771	$	3,497

(dollars in thousands)	March 31, 2019		December 31, 2018
Identifiable Assets
Energy Solutions Segment	$	261,164	$	245,842
Industrial Solutions Segment		59,058		55,582
Fluid Handling Solutions Segment		72,621		72,507
Corporate and Other⁽³⁾		3,826		18,651
Identifiable assets	$	396,669	$	392,582

⁽³⁾	Corporate and Other assets consist primarily of cash and income tax related assets.

(dollars in thousands)	March 31, 2019		December 31, 2018
Goodwill
Energy Solutions Segment	$	97,053	$	97,143
Industrial Solutions Segment		23,436		23,436
Fluid Handling Solutions Segment		31,577		31,577
Goodwill	$	152,066	$	152,156

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:

	Three Months Ended March 31, 2019
						Less Inter-Segment Sales
(dollars in thousands)	Total Sales		Intra- Segment Sales			Industrial			Energy			Fluid			Corp and Other		Net Sales to Outside Customers
Net Sales
Energy Solutions Segment	$	56,150	$	(891	)	$	(59	)		—		$	(12	)	$	—	$	55,188
Industrial Solutions Segment		21,822		(2,177	)		—			(746	)		(46	)		—		18,853
Fluid Handling Solutions Segment		12,416		(394	)		(52	)		—			—			—		11,970
Corporate and Other		—		—			—			—			—			—		—
Net Sales	$	90,388	$	(3,462	)	$	(111	)	$	(746	)	$	(58	)	$	—	$	86,011

	Three Months Ended March 31, 2018
						Less Inter-Segment Sales
(dollars in thousands)	Total Sales		Intra- Segment Sales			Industrial			Energy			Fluid		Corp and Other		Net Sales to Outside Customers
Net Sales
Energy Solutions Segment	$	43,128	$	(2,469	)	$	(686	)	$	—		$	—	$	—	$	39,973
Industrial Solutions Segment		19,379		(791	)		—			(140	)		—		—		18,448
Fluid Handling Solutions Segment		16,115		(515	)		(44	)		—			—		—		15,556
Corporate and Other		—		—			—			—			—		162		162
Net Sales	$	78,622	$	(3,775	)	$	(730	)	$	(140	)	$	—	$	162	$	74,139

Divestitures

3 Months Ended

Mar. 31, 2019

Discontinued Operations And Disposal Groups [Abstract]

Divestitures

17.	Divestitures

Strobic Air Corporation

On March 30, 2018, the Company completed the sale of Strobic Air Corporation (“Strobic”) as part of its strategic decision to exit brands that do not align with the CECO portfolio to increase focus on better serving the energy and industrial solutions and fluid handling markets. The sales price was $28.5 million, subject to post-closing purchase price adjustments. The disposition resulted in an estimated gain of $6.9 million recorded in the first quarter of 2018, comprised of $27.9 million of net proceeds received as consideration after estimated post-closing purchase price adjustments less net assets disposed of $18.8 million and transaction costs of $2.2 million. The net assets disposed were primarily comprised of $13.0 million of goodwill, $2.3 million of definite-lived intangible assets and $1.2 million of indefinite-lived intangible assets allocated to the Strobic business. In the first quarter of 2018, Strobic reported $4.2 million in net sales and $1.1 million in income from operations. Strobic results through the date of disposition are included within income before income taxes in the Condensed Consolidated Statement of Income and are reported within the Fluid Handling Solutions segment. The sale of Strobic did not constitute a significant strategic shift that will have a material impact on the Company’s ongoing operations and financial results.

Keystone Filter

On February 28, 2018, the Company completed the sale of the Keystone Filter brand (“Keystone”) as part of its strategic decision to exit brands that do not align with the CECO portfolio to increase focus on better serving energy and industrial solutions and fluid handling markets. The sales price was $7.5 million, subject to post-closing purchase price adjustments. The disposition resulted in an estimated gain of $4.3 million recorded in the first quarter of 2018, comprised of $7.2 million of net proceeds received as consideration after estimated post-closing purchase price adjustments less net assets disposed of $2.7 million and transaction costs of $0.2 million. Keystone results are reported within the Fluid Handling Solutions segment through the date of disposition.

Zhongli

On November 27, 2018, the Company completed the sale of Jiangyin Zhongli Industrial Technology Co. Ltd (“Zhongli”), a business in our Energy Solutions segment operating in China for a price of $3.6 million. In the third quarter of 2018, we classified the assets and liabilities of Zhongli as held-for-sale. In connection with classifying this business as held-for-sale, GAAP required us to assess impairment by comparing the estimated selling price, less cost to sell to our carrying value in Zhongli. Based on this analysis, we recorded a $15.1 million estimated loss. The disposal of this business does not constitute a significant strategic shift that will have a material impact on the Company’s ongoing operations and financial results. In the first quarter of 2018, Zhongli reported net sales of $1.7 million. Zhongli results are reported within the Energy Solutions segment through the date of disposition.

New Financial Accounting Pronouncements (Policies)	3 Months Ended
New Financial Accounting Pronouncements (Policies)	Mar. 31, 2019
Accounting Changes And Error Corrections [Abstract]
Accounting Standards Adopted in Fiscal 2019	Accounting Standards adopted in Fiscal 2019 In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases,” which, together with its related clarifying ASUs, provides revised guidance for lease accounting and related disclosure requirements and 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. Under the guidance, leases are classified as either finance or operating, with classification affecting the pattern of expense recognition. We adopted ASU 2016-02 effective January 1, 2019, using the modified retrospective method which was applied to leases that existed or were entered into on or after January 1, 2019. The Company elected to utilize the package of practical expedients that allows us to 1) not reassess whether any expired or existing contracts are or contain leases, 2) retain the existing classification of lease contracts as of the date of adoption, and 3) not reassess initial direct costs for any existing leases. We also elected to not separate lease and non-lease components, for all leases. The adoption of this standard had a material impact on our consolidated balance sheet due to the recognition of ROU assets and liabilities for our operating leases totaling $13.3 million, as well as an adjustment to beginning equity of $4.6 million, net of tax, related to prior sales lease back transaction. The adoption of the standard did not have a material impact on our statement of income or liquidity. See Note 12 – Leases for disclosures related to the amended guidance. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” This guidance expands an entity’s ability to apply hedge accounting for nonfinancial and financial risk components and allows for a simplified approach for fair value hedging of interest rate risk. Additionally, this ASU 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. The Company adopted this ASU on January 1, 2019 and applied the modified retrospective approach through a cumulative-effect adjustment from accumulated other comprehensive income (“AOCI”) to retained earnings as of the effective date. The impact of the adoption of this ASU was not material.
Accounting Standards Yet to be Adopted	Accounting Standards Yet to be Adopted In August 2018, the FASB issued ASU 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans,” that makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. The new guidance eliminates requirements for certain disclosures that are no longer considered cost beneficial and requires new ones that the FASB considers pertinent. ASU 2018-14 is effective for the Company January 1, 2021. The Company is evaluating the impact of the adoption of ASU 2018-14 on its consolidated financial statements.

Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Summary of Accounts Receivable

(table only in thousands)	March 31, 2019			December 31, 2018
Contract receivables	$	65,453		$	48,826
Trade receivables		10,435			7,296
Allowance for doubtful accounts		(2,925	)		(2,897	)
Total accounts receivable	$	72,963		$	53,225

Costs and Estimated Earnings on Uncompleted Contracts (Tables)

3 Months Ended

Mar. 31, 2019

Text Block [Abstract]

Costs and Estimated Earnings on Uncompleted Contracts

(table only in thousands)	March 31, 2019			December 31, 2018
Costs incurred on uncompleted contracts	$	193,393		$	174,168
Estimated earnings		76,693			67,427
Total costs and estimated earnings on uncompleted contracts, gross		270,086			241,595
Less billings to date		(261,981	)		(232,045	)
Total costs and estimated earnings on uncompleted contracts, net	$	8,105		$	9,550
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	$	31,701		$	29,694
Billings in excess of costs and estimated earnings on uncompleted contracts		(23,596	)		(20,144	)
Total costs and estimated earnings on uncompleted contracts, net	$	8,105		$	9,550

Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

(table only in thousands)	March 31, 2019			December 31, 2018
Raw materials	$	15,867		$	15,819
Work in process		5,392			6,098
Finished goods		748			807
Obsolescence allowance		(2,227	)		(1,907	)
Total inventories	$	19,780		$	20,817

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill / Tradenames

(table only in thousands)	Three months ended March 31, 2019						Year ended December 31, 2018
Goodwill / Tradenames	Goodwill			Tradenames			Goodwill			Tradenames
Beginning balance	$	152,156		$	18,258		$	166,951		$	19,691
Transfers to finite life classification		—			(3,904	)		—			—
Divestitures		—			—			(14,317	)		(1,340	)
Foreign currency translation		(90	)		(40	)		(478	)		(93	)
	$	152,066		$	14,314		$	152,156		$	18,258

Intangible Assets - Finite Life

(table only in thousands)	As of March 31, 2019					As of December 31, 2018
Intangible assets – finite life	Cost			Accum. Amort.		Cost			Accum. Amort.
Technology	$	14,457		$	9,674	$	14,457		$	9,414
Customer lists		68,943			39,611		68,943			37,873
Noncompetition agreements		910			799		910			762
Tradename		5,294			712		1,390			579
Foreign currency adjustments		(1,554	)		(379)		(1,520	)		(407	)
	$	88,050		$	50,417	$	84,180		$	48,221

Summary of Finite Lived Intangible Assets Activities

Activity for the three-months ended March 31, 2019 and 2018 is as follows:

(table only in thousands)	2019			2018
Intangible assets – finite life, net at beginning of period	$	35,959		$	49,956
Amortization expense		(2,160	)		(2,555	)
Divestitures		—			(2,372	)
Transfers from indefinite life classification		3,904			—
Foreign currency adjustments		(70	)		259
Intangible assets – finite life, net at end of period	$	37,633		$	45,288

Accounts Payable and Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2019

Payables And Accruals [Abstract]

Summary of Accounts Payable and Accrued Expenses

(table only in thousands)	March 31, 2019		December 31, 2018
Trade accounts payable, including due to subcontractors	$	53,315	$	51,984
Compensation and related benefits		5,375		7,578
Short-term lease liabilities		2,939		—
Accrued warranty		3,509		3,384
Contract liabilities		5,982		6,541
Other accrued expenses		8,081		10,742
Total accounts payable and accrued expenses	$	79,201	$	80,229

Senior Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Summary of Debt

Debt consisted of the following at March 31, 2019 and December 31, 2018:

(table only in thousands)	March 31, 2019			December 31, 2018
Outstanding borrowings under Credit Facility (defined below). Term loan balance due upon maturity in September 2020.
- Term loan	$	76,147		$	76,147
- U.S. Dollar revolving loans		—			—
- Unamortized debt discount		(1,422	)		(1,691	)
Total outstanding borrowings under Credit Facility	$	74,725		$	74,456

Earnings and Dividends per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Number of Shares Outstanding for Calculation of Earnings Per Share

The computational components of basic and diluted earnings per share for the three-month periods ended March 31, 2019 and 2018 are below.

	For the three month period ended March 31,
	2019		2018
(Table only in thousands) Numerator (for basic and diluted earnings per share)
Net income	$	1,864	$	5,763

Denominator
Basic weighted-average shares outstanding		34,836		34,593
Common stock equivalents arising from stock options and restricted stock awards		524		48
Diluted weighted-average shares outstanding		35,360		34,641

Pension and Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Pension and Employee Benefit Expenses

The components of the expense consisted of the following:

	Three Months Ended March 31,
(table only in thousands)	2019			2018
Pension plan:
Service cost	$	—		$	97
Interest cost		326			298
Expected return on plan assets		(313	)		(476	)
Amortization of net actuarial loss		65			59
Net periodic benefit cost (gain)	$	78		$	(22	)
Health care plan:
Interest cost	$	1		$	1
Amortization of loss		2			2
Net periodic benefit cost	$	3		$	3

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Schedule of Components of Lease Expense

The components of lease expense were as follows:

(table only in thousands)	For the Three Months Ended March 31, 2019
Operating lease cost (a)	$	913
Finance lease cost:
Amortization of right-of-use assets		77
Interest on lease liability		92
Total finance lease cost		169
Total lease cost	$	1,082
(a) includes variable lease costs which are immaterial

Summary of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases was as follows:

(table only in thousands)	For the Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	871
Operating cash flows from finance leases	$	92
Financing cash flows from finance leases	$	116
Right of use assets obtained in exchange for lease obligations
Operating leases	$	1,039

Summary of Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheet information related to leases was as follows:

(table only in thousands)	March 31, 2019
Operating leases
Right-of-use assets from operating leases	$	13,260

Accounts payable and accrued expenses	$	2,452
Operating lease liabilities		10,822
Total operating lease liabilities	$	13,274

Finance leases
Property, plant and equipment, net	$	3,462

Accounts payable and accrued expenses	$	487
Other liabilities		7,731
Total finance lease liabilities	$	8,218

Schedule of Lease Terms and Discount Rate

Weighted-average remaining lease term
Operating leases		9 years
Finance leases		12 years
Weighted-average discount rate
Operating leases		5.4%
Finance leases		4.5%

Schedule of Maturities of Lease Liabilities

As of March 31, 2019, maturities of lease liabilities were as follows:

(table only in thousands)	Operating Leases			Finance Leases
2019	$	2,532		$	632
2020		2,477			855
2021		2,061			872
2022		1,452			889
2023		1,359			907
Thereafter		6,034			6,409
Total minimum lease payments	$	15,915		$	10,564
Less imputed interest		(2,641	)		(2,346	)
Lease liability	$	13,274		$	8,218

Schedule of Future Minimum Lease Payments for Operating Leases

(table only in thousands)	December 31, 2018
2019	$	2,745
2020		1,880
2021		1,454
2022		931
2023		851
Thereafter		2,278
Total	$	10,139

Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Net Sales and Income from Operation by Business Segment

The financial segment information is presented in the following tables:

	Three Months Ended March 31,
(dollars in thousands)	2019		2018
Net Sales (less intra-, inter-segment sales)
Energy Solutions Segment	$	55,188	$	39,973
Industrial Solutions Segment		18,853		18,448
Fluid Handling Solutions Segment		11,970		15,556
Corporate and Other⁽¹⁾		—		162
Net sales	$	86,011	$	74,139

⁽¹⁾	Includes adjustment for revenue on intercompany jobs.

	Three Months Ended March 31,
(dollars in thousands)	2019			2018
Income from Operations
Energy Solutions Segment	$	9,291		$	3,624
Industrial Solutions Segment		602			1,198
Fluid Handling Solutions Segment		2,358			3,381
Corporate and Other⁽²⁾		(7,361	)		4,533
Eliminations		—			(586	)
Income from operations	$	4,890		$	12,150

⁽²⁾

Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets

	Three Months Ended March 31,
(dollars in thousands)	2019		2018
Property and Equipment Additions
Energy Solutions Segment	$	50	$	18
Industrial Solutions Segment		61		75
Fluid Handling Solutions Segment		152		273
Corporate and Other		160		100
Property and equipment additions	$	423	$	466

	Three Months Ended March 31,
(dollars in thousands)	2019		2018
Depreciation and Amortization
Energy Solutions Segment	$	1,580	$	2,158
Industrial Solutions Segment		334		286
Fluid Handling Solutions Segment		738		990
Corporate and Other		119		63
Depreciation and amortization	$	2,771	$	3,497

(dollars in thousands)	March 31, 2019		December 31, 2018
Identifiable Assets
Energy Solutions Segment	$	261,164	$	245,842
Industrial Solutions Segment		59,058		55,582
Fluid Handling Solutions Segment		72,621		72,507
Corporate and Other⁽³⁾		3,826		18,651
Identifiable assets	$	396,669	$	392,582

⁽³⁾	Corporate and Other assets consist primarily of cash and income tax related assets.

Goodwill

(dollars in thousands)	March 31, 2019		December 31, 2018
Goodwill
Energy Solutions Segment	$	97,053	$	97,143
Industrial Solutions Segment		23,436		23,436
Fluid Handling Solutions Segment		31,577		31,577
Goodwill	$	152,066	$	152,156

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:

	Three Months Ended March 31, 2019
						Less Inter-Segment Sales
(dollars in thousands)	Total Sales		Intra- Segment Sales			Industrial			Energy			Fluid			Corp and Other		Net Sales to Outside Customers
Net Sales
Energy Solutions Segment	$	56,150	$	(891	)	$	(59	)		—		$	(12	)	$	—	$	55,188
Industrial Solutions Segment		21,822		(2,177	)		—			(746	)		(46	)		—		18,853
Fluid Handling Solutions Segment		12,416		(394	)		(52	)		—			—			—		11,970
Corporate and Other		—		—			—			—			—			—		—
Net Sales	$	90,388	$	(3,462	)	$	(111	)	$	(746	)	$	(58	)	$	—	$	86,011

	Three Months Ended March 31, 2018
						Less Inter-Segment Sales
(dollars in thousands)	Total Sales		Intra- Segment Sales			Industrial			Energy			Fluid		Corp and Other		Net Sales to Outside Customers
Net Sales
Energy Solutions Segment	$	43,128	$	(2,469	)	$	(686	)	$	—		$	—	$	—	$	39,973
Industrial Solutions Segment		19,379		(791	)		—			(140	)		—		—		18,448
Fluid Handling Solutions Segment		16,115		(515	)		(44	)		—			—		—		15,556
Corporate and Other		—		—			—			—			—		162		162
Net Sales	$	78,622	$	(3,775	)	$	(730	)	$	(140	)	$	—	$	162	$	74,139

New Financial Accounting Pronouncements - Additional Information (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Operating lease, right-of-use asset	$ 13,260
Operating lease liability	13,274
Prior sales lease back transaction net of tax	$ 4,600

Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables	$ 65,453	$ 48,826
Allowance for doubtful accounts	(2,925)	(2,897)
Total accounts receivable	72,963	53,225
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 10,435	$ 7,296

Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Receivables [Abstract]
Amount billed but not received under retainage provisions in contracts	$ 900		$ 900
Retainage receivables on contracts period	1 year
Bad debt expense	$ 137	$ 146

Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 193,393	$ 174,168
Estimated earnings	76,693	67,427
Total costs and estimated earnings on uncompleted contracts, gross	270,086	241,595
Less billings to date	(261,981)	(232,045)
Total costs and estimated earnings on uncompleted contracts, net	8,105		$ 9,550
Included in the accompanying condensed consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	31,701	29,694	29,694
Billings in excess of costs and estimated earnings on uncompleted contracts	(23,596)	$ (20,144)	(20,144)
Total costs and estimated earnings on uncompleted contracts, net	$ 8,105		$ 9,550

Costs and Estimated Earnings on Uncompleted Contracts - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]
Provision for estimated losses on uncompleted contracts	$ 0	$ 0

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Net [Abstract]
Raw materials	$ 15,867	$ 15,819
Work in process	5,392	6,098
Finished goods	748	807
Obsolescence allowance	(2,227)	(1,907)
Total inventories	$ 19,780	$ 20,817

Inventories - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Inventory Disclosure [Abstract]
Amounts credited to the allowance for obsolete inventory	$ 0.2	$ 0.3

Goodwill and Intangible Assets - Goodwill / Tradenames (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, beginning balance	$ 152,156	$ 166,951
Goodwill, divestitures		(14,317)
Goodwill, foreign currency translation	(90)	(478)
Goodwill, ending balance	152,066	152,156
Tradenames, beginning balance	18,258	19,691
Tradenames, transfers to finite life classification	3,904
Tradenames, divestitures		(1,340)
Tradenames, foreign currency translation	(40)	(93)
Tradenames, ending balance	$ 14,314	$ 18,258

Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 88,050	$ 84,180
Accumulated Amortization	50,417	48,221
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	14,457	14,457
Accumulated Amortization	9,674	9,414
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	68,943	68,943
Accumulated Amortization	39,611	37,873
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	910	910
Accumulated Amortization	799	762
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	5,294	1,390
Accumulated Amortization	712	579
Foreign Currency Adjustments [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	(1,554)	(1,520)
Accumulated Amortization	$ (379)	$ (407)

Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets – finite life, net at beginning of period	$ 35,959	$ 49,956
Amortization expense	(2,160)	(2,555)
Divestitures		(2,372)
Transfers from indefinite life classification	3,904
Foreign currency adjustments	(70)	259
Intangible assets – finite life, net at end of period	$ 37,633	$ 45,288

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Amortization expense of finite life intangible assets	$ 2,160	$ 2,555
Amortization expense of finite life intangibles for 2019	6,300
Amortization expense of finite life intangibles for 2020	6,800
Amortization expense of finite life intangibles for 2021	5,700
Amortization expense of finite life intangibles for 2022	4,800
Amortization expense of finite life intangibles for 2023	4,000
Finite lived intangible assets	37,633	$ 45,288	$ 35,959	$ 49,956
Certain Tradenames [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Finite lived intangible assets	$ 3,900
Finite lived intangible assets, useful life	10 years

Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Trade accounts payable, including due to subcontractors	$ 53,315	$ 51,984
Compensation and related benefits	5,375	7,578
Short-term lease liabilities	2,939
Accrued warranty	3,509	3,384
Contract liabilities	5,982	6,541
Other accrued expenses	8,081	10,742
Total accounts payable and accrued expenses	$ 79,201	$ 80,229

Senior Debt - Summary of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt	$ 74,725	$ 74,456
Term Loan [Member]
Debt Instrument [Line Items]
Total outstanding borrowings	76,147	76,147
Term Debt [Member]
Debt Instrument [Line Items]
Unamortized debt discount	$ (1,422)	$ (1,691)

Senior Debt - Summary of Debt (Parenthetical) (Detail)	3 Months Ended
Senior Debt - Summary of Debt (Parenthetical) (Detail)	Mar. 31, 2019
Term Loan [Member]
Debt Instrument [Line Items]
Term loans, year of maturity	2020-09

Senior Debt - Additional Information (Detail) - USD ($)	3 Months Ended
Senior Debt - Additional Information (Detail) - USD ($)	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018
Line Of Credit Facility [Line Items]
Payment on outstanding balance	$ 0
Final scheduled principal payment due in September 2020	$ 76,100,000
Weighted average stated interest rate on outstanding borrowings	5.25%			5.27%
Interest rate swap, fair value, asset	$ 300,000			$ 500,000
Maximum consolidated leverage ratio	375.00%
Scenario Forecast [Member]
Line Of Credit Facility [Line Items]
Maximum consolidated leverage ratio		325.00%	350.00%
Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Unused credit availability under credit facility	$ 52,600,000			50,700,000
Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities	27,400,000			$ 29,300,000
Netherlands Facility [Member] \| Euro-Denominated Bank Guarantee [Member]
Line Of Credit Facility [Line Items]
Bank guarantee agreement outstanding amount	$ 3,100

Earnings and Dividends per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator (for basic and diluted earnings per share)
Net income	$ 1,864	$ 5,763
Denominator
Basic weighted-average shares outstanding	34,835,550	34,592,803
Common stock equivalents arising from stock options and restricted stock awards	524,000	48,000
Diluted weighted-average shares outstanding	35,360,042	34,641,390

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Earnings and Dividends per Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings And Dividends Per Share [Abstract]
Anti-dilutive options and restricted stock units outstanding	0.5	0.6

Share-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation awards	$ 800,000	$ 600,000
Number of stock option granted	0	0
Cash received from employees and non-employee directors stock option exercised	$ 0	$ 4,000
Intrinsic value of option exercised	$ 0	$ 6,000
Number of options exercised	0	2,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock awards granted	400,000	20,000
Weighted-average fair value of restricted stock unit granted	$ 7.24	$ 4.27

Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 97
Interest cost	$ 326	298
Expected return on plan assets	(313)	(476)
Amortization of net actuarial loss	65	59
Net periodic benefit cost (gain)	78	(22)
Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Amortization of loss	2	2
Net periodic benefit cost (gain)	$ 3	$ 3

Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions	$ 100,000	$ 200,000
Unfunded liability plans	8,800,000		$ 8,800,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Anticipated contribution to fund the pension plan during the reminder of the fiscal year	400,000
Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Anticipated contribution to fund the pension plan during the reminder of the fiscal year	$ 24,000

Leases - Schedule of components of lease expense (Detail)
$ in Thousands

3 Months Ended

Mar. 31, 2019

USD ($)

Leases [Abstract]

Operating lease cost

$ 913

^[1]

Finance lease cost:

Amortization of right-of-use assets

Interest on lease liability

Total finance lease cost

169

Total lease cost

$ 1,082

[1]	includes variable lease costs which are immaterial

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 871
Operating cash flows from finance leases	92
Financing cash flows from finance leases	116
Operating leases	$ 1,039

Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
Right-of-use assets from operating leases	$ 13,260
Operating lease liabilities, current	$ 2,452
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Operating lease liabilities (Note 12)	$ 10,822
Total operating lease liabilities	13,274
Finance leases
Finance leases right of use asset	$ 3,462
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentMember
Finance lease liabilities, current	$ 487
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Finance lease liabilities, non-current	$ 7,731
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesMember
Total finance lease liabilities	$ 8,218

Leases - Schedule of Lease Terms and Discount Rate (Detail)	Mar. 31, 2019
Weighted-average remaining lease term
Operating leases	9 years
Finance leases	12 years
Weighted-average discount rate
Operating leases	5.40%
Finance leases	4.50%

Leases - Schedule of Maturities of Lease Liabilities (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
2019	$ 2,532
2020	2,477
2021	2,061
2022	1,452
2023	1,359
Thereafter	6,034
Total minimum lease payments	15,915
Less imputed interest	(2,641)
Lease liability	13,274
Finance leases
2019	632
2020	855
2021	872
2022	889
2023	907
Thereafter	6,409
Total minimum lease payments	10,564
Less imputed interest	(2,346)
Lease liability	$ 8,218

Leases - Schedule of Future Minimum Lease Payments for Operating Leases (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
2019	$ 2,745
2020	1,880
2021	1,454
2022	931
2023	851
Thereafter	2,278
Total	$ 10,139

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Taxes [Line Items]
Liability for uncertain tax positions	$ 1,000		$ 900
Deferred income taxes on undistributed earnings		$ (1,215)
Income tax expense	$ 842	$ 4,111
Effective income tax rate	31.10%	41.60%
U.S. federal statutory rate	21.00%
Foreign Subsidiaries [Member]
Income Taxes [Line Items]
Deferred income taxes on undistributed earnings	$ 600		$ 600
Federal Authorities [Member]
Income Taxes [Line Items]
Open tax years	2014 2015 2016 2017 2018 2019
State and Foreign Authorities [Member]
Income Taxes [Line Items]
Open tax years	2013 2014 2015 2016 2017 2018 2019

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value Of Financial Instruments [Line Items]
Fair value of note payable		$ 1,700
Cash and cash equivalents	$ 28,167	43,676
Cash held outside United States, principally in Netherlands, United Kingdom, China, and Canada	25,400	23,300
Credit Facility [Member]
Fair Value Of Financial Instruments [Line Items]
Fair value of debt issued	$ 76,100	$ 76,100

Commitments and Contingencies - Legal Matters - Additional Information (Detail)	3 Months Ended	207 Months Ended
	Mar. 31, 2019 USD ($) Case	Mar. 31, 2019 USD ($) Case	Dec. 31, 2018 Case
Commitments And Contingencies Disclosure [Abstract]
Cumulative settlement payments for cases involving asbestos-related claims \| $		$ 2,900,000
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses \| $		2,800,000
Average cost per settled claim excluding legal fees \| $	$ 35,000	$ 35,000
Number of claims pending	191	191	208
Number of new cases filed	9
Number of cases dismissed	21
Number of cases settled	5
Assessment regarding Loss contingency impact Description	We are not aware of any 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.

Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 86,011	$ 74,139
Income from operations	4,890	12,150
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	55,188	39,973
Income from operations	9,291	3,624
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	18,853	18,448
Income from operations	602	1,198
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	11,970	15,556
Income from operations	2,358	3,381
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales		162
Income from operations	$ (7,361)	4,533
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income from operations		$ (586)

Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property and equipment additions	$ 423	$ 466
Depreciation and amortization	2,771	3,497
Identifiable assets	396,669		$ 392,582
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	50	18
Depreciation and amortization	1,580	2,158
Identifiable assets	261,164		245,842
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	61	75
Depreciation and amortization	334	286
Identifiable assets	59,058		55,582
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	152	273
Depreciation and amortization	738	990
Identifiable assets	72,621		72,507
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	160	100
Depreciation and amortization	119	$ 63
Identifiable assets	$ 3,826		$ 18,651

Business Segment Information - Goodwill (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Goodwill	$ 152,066	$ 152,156	$ 166,951
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	97,053	97,143
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	23,436	23,436
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 31,577	$ 31,577

Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 86,011	$ 74,139
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	55,188	39,973
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	18,853	18,448
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	11,970	15,556
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales		162
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(3,462)	(3,775)
Intra - Segment Sales [Member] \| Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(891)	(2,469)
Intra - Segment Sales [Member] \| Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(2,177)	(791)
Intra - Segment Sales [Member] \| Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(394)	(515)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	90,388	78,622
Operating Segments [Member] \| Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	56,150	43,128
Operating Segments [Member] \| Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	21,822	19,379
Operating Segments [Member] \| Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	12,416	16,115
Inter-segment Elimination [Member] \| Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(111)	(730)
Inter-segment Elimination [Member] \| Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(746)	(140)
Inter-segment Elimination [Member] \| Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(58)
Inter-segment Elimination [Member] \| Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales		162
Inter-segment Elimination [Member] \| Energy Solutions Segment [Member] \| Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(59)	(686)
Inter-segment Elimination [Member] \| Energy Solutions Segment [Member] \| Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(12)
Inter-segment Elimination [Member] \| Industrial Solutions Segment [Member] \| Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(746)	(140)
Inter-segment Elimination [Member] \| Industrial Solutions Segment [Member] \| Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(46)
Inter-segment Elimination [Member] \| Fluid Handling Solutions Segment [Member] \| Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (52)	(44)
Inter-segment Elimination [Member] \| Corporate and Other [Member] \| Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales		$ 162

Divestitures - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended
	Nov. 27, 2018	Mar. 30, 2018	Feb. 28, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Estimated gain (loss) on disposal				$ (70)	$ 11,177
Gain (loss) on disposal				(70)	11,177
Net sales				$ 86,011	74,139
Strobic Air Corporation [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale price, subject to post-closing purchase price adjustments		$ 28,500
Estimated gain (loss) on disposal					6,900
Net proceeds after adjustments		27,900
Net assets disposed		18,800
Transaction-related cost		2,200
Goodwill		13,000
Net sales					4,200
Income from operations					1,100
Gain (loss) on disposal					6,900
Strobic Air Corporation [Member] \| Definite-Lived Intangible Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets		2,300
Strobic Air Corporation [Member] \| Indefinite-Lived Intangible Assets [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets		$ 1,200
Keystone Filter [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale price, subject to post-closing purchase price adjustments			$ 7,500
Estimated gain (loss) on disposal					4,300
Net proceeds after adjustments			7,200
Net assets disposed			2,700
Transaction-related cost			$ 200
Gain (loss) on disposal					4,300
Zhongli [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Estimated gain (loss) on disposal	$ (15,100)
Gain (loss) on disposal	(15,100)
Disposal group, consideration receivable	$ 3,600
Net sales					$ 1,700