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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Net sales	$ 110,139	$ 86,945	$ 318,814	$ 256,072
Net (loss) income attributable to CECO Environmental Corp.	$ 1,985	$ (319)	$ 9,767	$ 2,660
Earnings (loss) per share:
Basic	$ 0.06	$ (0.01)	$ 0.28	$ 0.08
Diluted	$ 0.06	$ (0.01)	$ 0.28	$ 0.07