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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Business Acquisition [Line Items]
Net sales	$ 129,181	$ 113,063	$ 245,297	$ 216,077
Net income attributable to CECO Environmental Corp.	$ 3,724	$ 4,271	$ 5,462	$ 6,853
Earnings (loss) per share:
Basic	$ 0.11	$ 0.12	$ 0.16	$ 0.20
Diluted	$ 0.11	$ 0.12	$ 0.16	$ 0.20