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Acquisitions - 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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Business Acquisition [Line Items]
Net sales	$ 197,599	$ 174,654	$ 559,687	$ 515,276
Net income attributable to CECO Environmental Corp.	$ 1,499	$ 1,834	$ 46,993	$ 7,159
Earnings per share:
Basic	$ 0.04	$ 0.05	$ 1.33	$ 0.21
Diluted	$ 0.04	$ 0.05	$ 1.29	$ 0.2

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