Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Earnings per share amounts are computed independently each quarter. Accordingly, the sum of each quarter’s per share amount may not equal the total per share amount for the respective year.

	Quarter
(Table only in thousands, except per share data)	First		Second		Third		Fourth
Year ended December 31, 2017
Net sales	$	92,651	$	93,870	$	84,987	$	73,543
Gross profit		31,929		28,486		27,133		25,646
Net income (loss)		38		5,486		3,036		(11,589	)
Net income (loss) attributable to CECO Environmental Corp.		38		5,486		3,036		(11,589	)
Basic earnings (loss) per share	$	0.00	$	0.16	$	0.09	$	(0.34	)
Diluted earnings (loss) per share	$	0.00	$	0.16	$	0.09	$	(0.34	)
Year ended December 31, 2016
Net sales	$	103,175	$	112,258	$	101,596	$	99,982
Gross profit		31,586		33,930		33,676		35,667
Net income (loss)		3,055		4,037		5,826		(51,172	)
Net income (loss) attributable to CECO Environmental Corp.		3,100		4,050		5,804		(51,172	)
Basic earnings (loss) per share	$	0.09	$	0.12	$	0.17	$	(1.49	)
Diluted earnings (loss) per share	$	0.09	$	0.12	$	0.17	$	(1.49	)