Acquisitions and Joint Ventures - 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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Business Acquisition [Line Items]
Net sales	$ 106,995	$ 85,828	$ 204,280	$ 164,979
Net (loss) income attributable to CECO Environmental Corp.	$ 4,573	$ 431	$ 7,508	$ 2,415
(Loss) earnings per share:
Basic	$ 0.13	$ 0.01	$ 0.21	$ 0.07
Diluted	$ 0.13	$ 0.01	$ 0.21	$ 0.07