Discontinued Operations - Additional Information (Detail)	9 Months Ended
Sep. 30, 2018
Discontinued Operations And Disposal Groups [Abstract]
Lease expiration year	2019

The latest lease expiration of all leases related to discontinued operations.

No definition available.

Name:	ceco_DiscontinuedOperationsLeaseExpirationYear
Namespace Prefix:	ceco_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration