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Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Details) - Malvar Engineering Limited [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Business Acquisition [Line Items] |  |
Net sales | $ 126,332 | $ 122,195
Net income attributable to CECO Environmental Corp. | $ 1,508 | $ 2,728
Earnings per share: |  |
Basic | $ 0.04 | $ 0.08
Diluted | $ 0.04 | $ 0.08

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