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Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Details) - Malvar Engineering Limited [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |
Net sales | $ 636,191 | $ 662,569 | $ 478,802
Net income attributable to CECO Environmental Corp | $ 16,332 | $ 17,013 | $ 20,179
Earnings Per Share [Abstract] |  |  |
Basic | $ 0.47 | $ 0.49 | $ 0.58
Diluted | $ 0.45 | $ 0.48 | $ 0.58

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