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Quarterly Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 93,854 $ 88,256 $ 81,089 $ 74,139 $ 73,543 $ 84,987 $ 93,870 $ 92,651 $ 337,339 $ 345,051 $ 417,011
Gross profit 29,777 28,674 27,525 25,561 25,646 27,133 28,486 31,929 $ 111,537 $ 113,194 $ 134,859
Net income (loss) attributable to CECO Environmental Corp. $ 931 $ (12,915) $ (901) $ 5,763 $ (11,589) $ 3,036 $ 5,486 $ 38      
Basic earnings (loss) per share $ 0.03 $ (0.37) $ (0.03) $ 0.17 $ (0.34) $ 0.09 $ 0.16 $ 0.00 $ (0.21) $ (0.09) $ (1.12)
Diluted earnings (loss) per share $ 0.03 $ (0.37) $ (0.03) $ 0.17 $ (0.34) $ 0.09 $ 0.16 $ 0.00 $ (0.21) $ (0.09) $ (1.12)