Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 324,140,000	$ 316,011,000	$ 341,869,000
Cost of sales	223,218,000	210,883,000	227,770,000
Gross profit	100,922,000	105,128,000	114,099,000
Selling and administrative expenses	81,797,000	76,926,000	85,978,000
Amortization and earnout expenses	7,789,000	8,799,000	8,499,000
Restructuring expenses	632,000	2,331,000	1,097,000
Acquisition and integration expenses	818,000	1,354,000	465,000
Executive transition expenses	29,000	1,522,000
Loss on divestitures			70,000
Intangible asset impairment	0	850,000	0
Income from operations	9,857,000	13,346,000	17,990,000
Other income (expense), net	2,231,000	2,033,000	(751,000)
Interest expense	(2,952,000)	(3,535,000)	(5,397,000)
Income before income taxes	4,674,000	11,844,000	13,344,000
Income tax expense (benefit)	2,691,000	3,672,000	(4,363,000)
Net income	1,983,000	8,172,000	17,707,000
Noncontrolling interest	557,000	(39,000)
Net income (loss) attributable to CECO Environmental Corp.	$ 1,426,000	$ 8,211,000	$ 17,707,000
Income (loss) per share:
Basic	$ 0.04	$ 0.23	$ (0.51)
Diluted	$ 0.04	$ 0.23	$ (0.50)
Weighted average number of common shares outstanding:
Basic	35,345,785	35,289,616	34,987,878
Diluted	35,594,779	35,520,670	35,484,273