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Discontinued Operations - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2018
Discontinued Operations And Disposal Groups [Abstract] |
Lease expiration year | 2019

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- 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

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- References No definition available. + Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration