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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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