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Earnings per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to CECO Environmental Corp.	$ (1,249)	$ (239)	$ 224	$ 6,431
Denominator
Basic weighted-average shares outstanding	35,472,298	35,358,913	35,463,279	35,263,688
Common stock equivalents arising from stock options and restricted stock awards	0	0	267,000	208,000
Diluted weighted-average shares outstanding	35,472,298	35,358,913	35,729,887	35,471,551

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