v3.23.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2023
Oct. 30, 2023
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2023  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Trading Symbol CECO  
Entity Registrant Name CECO ENVIRONMENTAL CORP.  
Entity Central Index Key 0000003197  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity File Number 0-07099  
Entity Tax Identification Number 13-2566064  
Entity Address, Address Line One 14651 North Dallas Parkway  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town Dallas  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75254  
City Area Code 214  
Local Phone Number 357-6181  
Entity Common Stock, Shares Outstanding   34,812,539
Entity Interactive Data Current Yes  
Entity Small Business true  
Entity Emerging Growth Company false  
Document Transition Report false  
Document Quarterly Report true  
Entity Shell Company false  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE