Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 101,596	$ 98,230	$ 317,029	$ 266,176
Cost of sales	67,920	67,435	217,837	187,778
Gross profit	33,676	30,795	99,192	78,398
Selling and administrative expenses	19,549	18,054	60,625	46,158
Acquisition and integration expenses	163	5,685	524	6,978
Amortization and earn-out expenses	3,465	9,250	13,176	19,989
Income (loss) from operations	10,499	(2,194)	24,867	5,273
Other income (expense), net	14	(282)	395	(1,456)
Interest expense	(1,913)	(1,711)	(5,995)	(3,845)
Income (loss) before income taxes	8,600	(4,187)	19,267	(28)
Income tax expense	2,774	638	6,349	2,495
Net income (loss)	5,826	(4,825)	12,918	(2,523)
Net income (loss) attributable to noncontrolling interest	22		(36)
Net income (loss) attributable to CECO Environmental Corp.	$ 5,804	$ (4,825)	$ 12,954	$ (2,523)
Earnings (loss) per share:
Basic	$ 0.17	$ (0.17)	$ 0.38	$ (0.09)
Diluted	$ 0.17	$ (0.17)	$ 0.38	$ (0.09)
Weighted average number of common shares outstanding:
Basic	33,983,708	28,617,589	33,952,768	27,066,072
Diluted	34,354,687	28,617,589	34,211,067	27,066,072