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Discontinued Operations - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]
Lease expiration year	2019

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration