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Acquisitions - 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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 136,533 | $ 156,503 | $ 406,507 | $ 420,078
Net income attributable to CECO Environmental Corp. | $ 2,838 | $ 4,257 | $ 9,910 | $ 11,881
Earnings per share: |  |  |  |
Basic | $ 0.08 | $ 0.12 | $ 0.28 | $ 0.34
Diluted | $ 0.08 | $ 0.12 | $ 0.27 | $ 0.34

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