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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]
Balance, Beginning of Period		$ 6,301	$ 14,474
Charges Incurred	[1]	64	365
Net Cash Payments		(2,177)	(2,719)
Balance, End of Period		$ 4,188	$ 12,120
[1] Includes subsequent adjustments for accretion, revised estimates and variances between estimated and actual charges, net of any reversals for terminated lease obligations.

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- Definition

For the disposal group, including a component of the entity (discontinued operation), the present value of remaining lease obligations recorded at the time a facility is exited.

+ References

No definition available.

+ Details

Name:	ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations
Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Disposal group including discontinued operation remaining lease obligations incurred and reversal.

+ References

No definition available.

+ Details

Name:	ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurredAndReversal
Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

For the disposal group, including a component of the entity (discontinued operation), the decrease during the period for remaining lease obligations related to cash payments for vacated facilities.

+ References

No definition available.

+ Details

Name:	ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsNetCashPayments
Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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