Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Details) - General Rubber LLC [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Business Acquisition [Line Items]
Net sales	$ 137,522	$ 135,260	$ 263,854	$ 257,455
Net income attributable to CECO Environmental Corp.	$ 4,485	$ 4,292	$ 5,993	$ 7,019
Earnings per share:
Basic	$ 0.13	$ 0.12	$ 0.17	$ 0.2
Diluted	$ 0.12	$ 0.12	$ 0.17	$ 0.2