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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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