Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 71,892	$ 80,486
Cost of sales	47,485	52,207
Gross profit	24,407	28,279
Selling and administrative expenses	19,454	21,953
Amortization and earnout expenses	1,791	1,713
Restructuring expenses		374
Acquisition and integration expenses	108
Income from operations	3,054	4,239
Other (expense) income, net	(480)	975
Interest expense	(725)	(1,023)
Income before income taxes	1,849	4,191
Income tax expense	551	779
Net income	1,298	3,412
Noncontrolling interest	117
Net income attributable to CECO Environmental Corp.	$ 1,181	$ 3,412
Earnings per share:
Basic	$ 0.03	$ 0.10
Diluted	$ 0.03	$ 0.10
Weighted average number of common shares outstanding:
Basic	35,396,705	35,155,377
Diluted	35,774,208	35,394,865