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Earnings per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net loss attributable to CECO Environmental Corp.	$ 4,385	$ 293	$ 7,180	$ 1,474
Denominator
Basic weighted-average shares outstanding	34,873,238	35,491,725	34,961,645	35,444,477
Common stock equivalents arising from stock options and restricted stock awards	168,000	327,000	158,000	353,000
Diluted weighted-average shares outstanding	35,041,152	35,819,269	35,119,685	35,797,001

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