Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Borrowings on revolving line of credit. Borrowings On Revolving Line Of Credit Borrowings on revolving credit lines Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative Document Transition Report Document Transition Report Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Deferred Consideration Paid For Acquisitions Deferred Consideration Paid For Acquisitions Deferred consideration paid for acquisitions Kemco Systems Co Llc [Member] Kemco Systems Co Llc [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Receivables, Long-term Contracts or Programs, Total Receivables, Long-Term Contracts or Programs Contract receivables Other Liabilities, Noncurrent, Total Other Liabilities, Noncurrent Other liabilities Schedule of Segment Reporting Information, by Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Increase (Decrease) in Prepaid Expense and Other Assets, Total Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expense and other current assets Restricted Stock Units (RSUs) [Member] Restricted Stock Units [Member] Finite-Lived Intangible Asset, Expected Amortization, Year Two Amortization expense of finite life intangibles for 2025 Receivable Type [Axis] Receivable Type Revenue from Contract with Customer, Excluding Assessed Tax, Total Revenue from Contract with Customer, Excluding Assessed Tax Net sales DS21 Co., Ltd. [Member] DS21 Co., Ltd. [Member] DS21 Co., Ltd. Compass Water Solutions, Inc [Member] Compass Water Solutions, Inc [Member] Short-Term Debt, Type [Axis] Loss Contingency, Pending Claims, Number, Ending Balance Loss Contingency, Pending Claims, Number, Beginning Balance Loss Contingency, Pending Claims, Number Number of claims pending Schedule of Business Acquisitions, by Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Accounts Payable, Trade, Current Trade accounts payable, including amounts due to subcontractors Contract with Customer, Liability, Current Billings in excess of costs and estimated earnings on uncompleted contracts Net income attributable to CECO Environmental Corp. Interest Income (Expense), Net, Total Interest Income (Expense), Net Title of Individual [Domain] Title of Individual Disclosure Text Block [Abstract] Stock Issued During Period, Shares, Issued for Services Restricted stock units issued, Shares Payments on finance leases and financing liability. Payments On Finance Leases And Financing Liability Payments on finance leases and financing liability Operating Lease, Liability, Noncurrent Operating lease liabilities Common stock repurchase and retirement (see Note 9), Shares Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Liability, Defined Benefit Pension Plan, Noncurrent Unfunded liability plans Noncontrolling interest Non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest, Total Net Income (Loss) Attributable to Noncontrolling Interest Defined Benefit Plan, Expected Return (Loss) on Plan Assets Expected return on plan assets Debt Instrument, Unamortized Discount, Total Debt Instrument, Unamortized Discount Unamortized debt discount Malvar Engineering Limited [Member] Malvar Engineering Limited [Member] Malvar Engineering Limited [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule Of Accounts Notes Loans And Financing Receivable [Table] 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Bank Guarantees [Member] Bank Guarantees [Member] Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Denominator Line of Credit Facility [Table] Line Of Credit Facility [Table] Investment, Name [Axis] Outstanding borrowing under the joint venture term debt Warehouse Agreement Borrowings Warehouse Agreement Borrowings, Total Award Type [Axis] Award Type General Rubber LLC [Member] General rubber llc . Noncontrolling interest acquired Noncontrolling Interest, Increase from Business Combination Assets Total assets Identifiable assets Right-of-use assets from operating leases Right-of-use assets from operating leases Operating Lease, Right-of-Use Asset Line of Credit Facility [Line Items] Line Of Credit Facility [Line Items] Liability for Uncertainty in Income Taxes, Noncurrent Liability for uncertain tax positions Entity Registrant Name Entity Registrant Name Related Party, Type [Domain] Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit) Accumulated loss Proceeds from Stock Plans Cash received from employee stock option exercised Cash paid during the period for: Supplemental Cash Flow Information [Abstract] additional consideration additional consideration Earn Out Retained Earnings [Member] Accumulated Loss [Member] Corporate and Other [Member] Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Total shareholders' equity Fair value of financial instruments. Fair Value Of Financial Instruments [Line Items] Fair Value Of Financial Instruments [Line Items] Deferred Income Tax Liabilities, Net, Total Deferred Income Tax Liabilities, Net Deferred income tax liability, net Minimum [Member] Minimum [Member] Litigation and settlement awarded from insurers. 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Customer Lists And Trade Name [Member] Customer Lists and Tradename [Member] Unrealized foreign currency (loss) gain Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Fair value adjustment to earnout liabilities Assets [Abstract] ASSETS Engineered systems member. Engineered Systems [Member] Engineered Systems Segment [Member] Amortization of Intangible Assets, Total Amortization of Intangible Assets Amortization expense of finite life intangible assets Amortization expense Base Rate [Member] Base Rate [Member] Customer Lists [Member] Customer Lists [Member] Common stock, $.01 par value; 100,000,000 shares authorized, 34,811,077 and 34,381,668 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common Stock, Value, Issued Repayments of Long-term Debt, Total Repayments of Long-Term Debt Repayments of long-term debt Income (Loss) from Continuing Operations, Per Diluted Share Diluted Euro-denominated bank guarantee. 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State And Foreign Authorities [Member] State and Foreign Authorities [Member] Interest Paid, Excluding Capitalized Interest, Operating Activities Interest Finite-Lived Intangible Asset, Expected Amortization, Year Four Amortization expense of finite life intangibles for 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Amortization expense of finite life intangibles for 2024 Lease liabilities, current. 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Term Debt [Member] Term Debt [Member] Account receivable, net Retainage receivables on contracts period. Retainage Receivables On Contracts Period Retainage receivables on contracts period Noncontrolling interest distributions Payments to Noncontrolling Interests Debt Instrument, Name [Domain] Debt Instrument, Name Open Tax Year Open tax years Income taxes. Income Taxes [Line Items] Income Taxes [Line Items] Weighted-average volatility rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Other Pension, Postretirement and Supplemental Plans [Member] Health Care Plan [Member] Increase (decrease) in deferred charges and other assets. Increase Decrease In Deferred Charges And Other Assets Deferred charges and other assets Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock Capital in excess of par value Pension Plan [Member] Pension Plan [Member] Certain trade names. Certain Trade Names [Member] Certain Tradenames [Member] Accounting Standards to be Adopted New accounting standards not yet adopted policy. New Accounting Standards Not Yet Adopted Policy [Text Block] Payments for Repurchase of Common Stock Common stock repurchase Common stock repurchase Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Total Equity, Attributable to Noncontrolling Interest Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options, Shares Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS’ EQUITY Environmental Integrated Solutions. 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Transfers From Indefinite Life Classification Transfers from indefinite life classification Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Current liabilities assumed Accounts payable Increase (Decrease) in Accounts Payable Increase (Decrease) in Accounts Payable, Total Finite-Lived Intangible Asset, Expected Amortization, Year Three Amortization expense of finite life intangibles for 2026 Credit Facility [Domain] Credit Facility Interest Revenue (Expense), Net, Total Interest Revenue (Expense), Net Net revenue Proceeds from (Repayments of) Lines of Credit, Total Proceeds from (Repayments of) Lines of Credit Repayments on revolving credit lines Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Number of restricted stock awards granted Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Equity Components [Axis] Equity Components Accounts Receivable, Net Current Assets Increase (Decrease) in Accounts Receivable Accounts receivable Other liabilities, net Increase (Decrease) in Other Operating Liabilities, Total Increase (Decrease) in Other Operating Liabilities Retirement Benefits [Text Block] Pension and Employee Benefit Plans Inventory Disclosure [Abstract] Accounting Standards Update and Change in Accounting Principle [Text Block] New Financial Accounting Pronouncements Local Phone Number Local Phone Number Inventory Valuation Reserves, Ending Balance Inventory Valuation Reserves, Beginning Balance Inventory Valuation Reserves Obsolescence allowance Goodwill, Total Goodwill Goodwill, ending balance Goodwill, beginning balance Goodwill Indefinite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Tradename, foreign currency translation Restricted Cash, Current Restricted cash Loss Contingency, New Claims Filed, Number Number of new cases filed Statement of Cash Flows [Abstract] Director [Member] Non-Employee Director [Member] Income Tax Authority [Domain] Income Tax Authority Organization, Consolidation and Presentation of Financial Statements [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Gross Profit Gross profit Common Stock, Par or Stated Value Per Share Common stock, par value Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Contract liability Contract liability current. 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Intra Segment And Inter Segment Elimination By Revenue Table [Text Block] Intra-Segment and Inter-Segment Revenues Schedule of Inventory, Current [Table Text Block] Summary of Inventories Segment Reporting Disclosure [Text Block] Business Segment Information EFM JV [Member] Effox Flextor Madder [Member] Effox Flextor Madder [Member] City Area Code City Area Code Inventory, Net Inventories, net Total inventories Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Consolidation Items [Axis] Consolidation Items Segment, Reconciliation of Other Items from Segments to Consolidated [Table Text Block] Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets Borrowing on long-term debt Proceeds from Issuance of Long-Term Debt Proceeds from Issuance of Long-term Debt, Total Business Acquisition [Line Items] Business Acquisition [Line Items] Weighted Average Number of Shares Outstanding, Basic, Total Weighted Average Number of Shares Outstanding, Basic Basic Basic weighted-average shares outstanding Prepaid Taxes Prepaid income taxes Inventory, Work in Process, Gross Work in process Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Statement [Table] Statement [Table] Document Fiscal Period Focus Document Fiscal Period Focus Joint Venture Agreement [Member] Joint venture agreement. 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Cash Held Outside Domestic Territory Cash held outside United States, principally in Netherlands, United Kingdom, China, and Canada Schedule of Finite-Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Loss Contingency, Claims Dismissed, Number Number of cases dismissed Notes Payable Notes Payable, Total Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of common shares outstanding: Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Entity Emerging Growth Company Entity Emerging Growth Company Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Option exercised, intrinsic value Business Acquisition, Percentage of Voting Interests Acquired Acquisition of equity Amendment Flag Amendment Flag Summary of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Contract with customer, liability increase decrease in billing in excess of cost of earnings. Contract With Customer Liability Increase Decrease In Billing In Excess Of Cost Of Earnings Billings in excess of costs and estimated earnings on uncompleted contracts Technology-Based Intangible Assets [Member] Technology [Member] Equity Method Investment, Ownership Percentage Percentage of equity method investment in joint venture Earnings and dividends per share. Earnings And Dividends Per Share [Abstract] Earnout payments. Earnout Payments Earnout Payments Investments, All Other Investments [Abstract] Subsidiaries [Member] Foreign Subsidiaries [Member] Variable Rate [Domain] Tradename, Acquisitions Indefinite-Lived Intangible Assets, Purchase Accounting Adjustments Securities Act File Number Entity File Number Goodwill and Intangible Assets Disclosure [Abstract] Contract Liabilities Recognized As Revenue Contract Liabilities Recognized As Revenue Other liabilities Assumed Other Liabilities Other Liabilities, Total Debt, less current portion Long-term Debt, Excluding Current Maturities, Total Long-Term Debt, Excluding Current Maturities Transcend Solution [Member] Transcend Solution [Member] Transcend Solution [Member] Other Assets, Total Other Assets Other Assets Share-Based Payment Arrangement [Abstract] Accounts payable Accounts Payable, Current Accounts Payable, Current, Total Debt Instrument [Axis] Debt Instrument Schedule of Intangible Assets and Goodwill [Table Text Block] Goodwill / Tradename Credit facility principal payments 2024 Long-Term Debt, Maturity, Year One Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued Preferred stock, $.01 par value; 10,000 shares authorized, none issued Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Title of Individual [Axis] Title of Individual Intra-Segment Sales [Member] Intersubsegment Eliminations [Member] Earnings Per Share [Text Block] Earnings per Share Foreign currency translation adjustment. Foreign Currency Translation Adjustment [Member] Foreign Currency Adjustments [Member] Entity Address, Address Line One Entity Address, Address Line One Payments for (Proceeds from) Investments, Total Payments for (Proceeds from) Investments Net cash paid for acquisition Weighted-average risk free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Risk-Free Interest Rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Risk-Free Interest Rate Netherlands facility. Netherlands Facility [Member] Netherlands Facility [Member] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Intangible - finite life Schedule Of Fair Value Of Financial Instruments [Table] Schedule Of Fair Value Of Financial Instruments [Table] Schedule Of Fair Value Of Financial Instruments [Table] Business Acquisition, Contingent Consideration [Line Items] Business Acquisition Contingent Consideration [Line Items] Finite-Lived Intangible Assets, Gross, Total Finite-Lived Intangible Assets, Gross Cost Credit facility principal payments 2026 Long-Term Debt, Maturity, Year Three Amortization of Debt Discount (Premium) Debt discount amortization Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Tradename, Impairment charge Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Deferred income taxes Deferred Tax Assets, Deferred Income Provision for credit losses Provision for Other Credit Losses Mader Holdings L.P. [Member] Mader holdings. Mader Holdings L P [Member] Debt Instrument, Frequency of Periodic Payment Frequency of periodic payment Depreciation, Depletion and Amortization, Total Depreciation, Depletion and Amortization Depreciation and amortization Title of 12(b) Security Title of 12(b) Security Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract] Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Share based compensation earned Schedule of Finite-Lived Intangible Assets [Table Text Block] Intangible Assets - Finite Life Assets, Fair Value Adjustment Fair value Accounting Changes and Error Corrections [Abstract] Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Revolving credit facility Long-term Line of Credit, Total Long-Term Line of Credit Bank guarantee agreement outstanding amount Increase (Decrease) in Inventories, Total Increase (Decrease) in Inventories Inventories Long-Lived Assets Noncurrent Assets Receivable [Domain] Receivable Amortization expense of finite life intangibles for 2023 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Stock Repurchase Program, Remaining Authorized Repurchase Amount Purchase of outstanding shares of common stock Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding Common Stock, shares outstanding Share-Based Payment Arrangement [Text Block] Share-Based Compensation Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Summary of Accounts Receivable Retirement Plan Type [Axis] Retirement Plan Type Document Type Document Type Line Of Credit [Member] Line of Credit [Member] Business Combination, Integration Related Costs Acquisition and integration expenses Litigation Settlement, Amount Awarded from Other Party Cumulative settlement payments for cases involving asbestos-related claims Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Document Quarterly Report Document Quarterly Report Schedule of Net Benefit Costs [Table Text Block] Components of Pension and Employee Benefit Expenses Counterparty Name [Domain] Counterparty Name Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period Entity Filer Category Entity Filer Category Accrued expenses Increase (Decrease) in Accrued Liabilities Increase (Decrease) in Accrued Liabilities, Total Variable Rate [Axis] Trade Names [Member] Tradename [Member] Debt Instrument, Redemption, Period Three [Member] Debt Instrument, Redemption, Thereafter [Member] Liabilities Liabilities Total liabilities Notes Payable Current1 Notes Payable Current is the part of Total Debt Notes Payable Finite-Lived Intangible Asset, Useful Life Intangible assets, Useful Life Intangible assets, Useful Life Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Equity, Attributable to Parent Total CECO shareholders' equity Subsegments [Axis] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Consolidated Entities [Axis] Consolidated Entities Net loss attributable to CECO Environmental Corp. Net Income (Loss) Net income (loss) attributable to CECO Environmental Corp. Interest Expense, Total Interest Expense Interest expense Standby Letters of Credit [Member] Letters of Credit [Member] Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total Contract with Customer, Asset, after Allowance for Credit Loss, Current Costs and estimated earnings in excess of billings on uncompleted contracts Reportable Subsegments [Member] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Deferred income tax liability Statement of Financial Position [Abstract] Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Share based compensation earned, Shares Weighted Average Number of Shares Outstanding, Diluted Diluted Diluted weighted-average shares outstanding Credit Facility [Axis] Credit Facility Effective Income Tax Rate Reconciliation, Percent, Total Effective Income Tax Rate Reconciliation, Percent Effective income tax rate Income (Loss) from Continuing Operations, Per Outstanding Share, Total Income (Loss) from Continuing Operations, Per Basic Share Basic Net periodic benefit cost (gain) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Income Tax Disclosure [Text Block] Income Taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Total assets acquired Total assets acquired Senior secured term loan. Senior Secured Term Loan [Member] Term Loan [Member] Stock Issued During Period, Value, Issued for Services Restricted stock units issued Increase in estimated fair value of earnout. Increase In Estimated Fair Value Of Earnout Increase in estimated fair value of earnout Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Indefinite lived intangible assets excluding goodwill during period transfers. Indefinite Lived Intangible Assets Excluding Goodwill During Period Transfers Tradename, transfers to finite life classification Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Number of Shares Outstanding for Calculation of Earnings Per Share Income Tax Authority [Axis] Income Tax Authority Fair Value Disclosures [Abstract] Debt Instrument, Redemption, Through September 2025 [Member] Debt Instrument, Redemption, Period One [Member] Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Acquisitions of property and equipment Amortization and earnout expenses Amortization and earnout expenses Amortization and earnout expenses Employee-related Liabilities, Current, Total Employee-related Liabilities, Current Compensation and related benefits Business Acquisition [Axis] Business Acquisition Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Technology [Member] Technology [Member] Income Tax Disclosure [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class Income Taxes [Table] Income Taxes [Table] Income Taxes [Table]