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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 13, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name CECO ENVIRONMENTAL CORP.    
Trading Symbol CECO    
Entity Central Index Key 0000003197    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Well Known Seasoned Issuer No    
Entity Public Float     $ 862.3
Entity Common Stock Shares Outstanding   34,989,986  
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NASDAQ    
Entity File Number 0-7099    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-2566064    
Entity Address, Address Line One 5080 Spectrum Drive    
Entity Address, Address Line Two Suite 800E    
Entity Address, City or Town Addison    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75001    
City Area Code 214    
Local Phone Number 357-6181    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference [Text Block]

Portions of the definitive Proxy Statement for the 2025 Annual Meeting of Stockholders, which is to be filed with the Securities and Exchange Commission within 120 days of the fiscal year ended December 31, 2024, are incorporated by reference into Part III of this Annual Report to the extent described herein.

    
Auditor Opinion

We have audited CECO Environmental Corp.’s (the “Company’s”) internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (the “COSO criteria”). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) ("PCAOB"), the consolidated balance sheets of the Company as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, shareholders’ equity, accumulated other comprehensive loss, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and our report dated February 25, 2025 expressed an unqualified opinion thereon.

    
Auditor Id 243    
Auditor Name BDO USA, P.C.    
Auditor Location Cincinnati, Ohio