Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 05, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	CECE
Entity Registrant Name	CECO ENVIRONMENTAL CORP
Entity Central Index Key	0000003197
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		17,818,584