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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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