CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net sales	$ 367,422	$ 263,217	$ 197,317
Cost of sales	258,251	178,394	135,762
Gross profit	109,171	84,823	61,555
Selling and administrative expenses	67,329	51,440	37,098
Acquisition and integration expenses	7,940	1,269	7,224
Amortization and earn out expenses	25,613	10,151	6,761
Intangible asset impairment	3,340
Legal reserves		300	3,500
Income from operations	4,949	21,663	6,972
Other (expense) income, net	(2,081)	(2,311)	982
Interest expense	(5,964)	(3,138)	(1,499)
(Loss) income before income taxes	(3,096)	16,214	6,455
Income tax expense (benefit)	2,638	3,137	(102)
Net (loss) income	(5,734)	13,077	6,557
Less net loss attributable to noncontrolling interest	(132)
Net (loss) income attributable to CECO Environmental Corp.	$ (5,602)	$ 13,077	$ 6,557
(Loss) earnings per share:
Basic	$ (0.19)	$ 0.51	$ 0.33
Diluted	$ (0.19)	$ 0.50	$ 0.32
Weighted average number of common shares outstanding:
Basic	28,791,662	25,750,972	20,116,991
Diluted	28,791,662	26,196,901	20,719,951