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Acquisitions and Joint Ventures - Schedule of Unaudited Pro Forma Financial Information (Details) - Environmental Integrated Solutions [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Net sales	$ 79,979	$ 77,943	$ 230,551	$ 246,550
Net (loss) income attributable to CECO Environmental Corp.	$ (1,249)	$ (222)	$ 224	$ 7,975
(Loss) earnings per share:
Basic	$ (0.04)	$ (0.01)	$ 0.01	$ 0.23
Diluted	$ (0.04)	$ (0.01)	$ 0.01	$ 0.22

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