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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |  |  |
Balance, Beginning of Period | $ 46,755 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations |  | $ 49,392 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations |  | $ 53,877 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations |
Charges Incurred | 14,129 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurred | [1] | 11,855 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurred | [1] | 8,689 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurred | [1]
Net Cash Payments | (26,546)ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsNetCashPayments | [2] | (14,780)ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsNetCashPayments | [2] | (13,174)ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsNetCashPayments | [2]
Other | 5,531 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsOther | [3] | 288 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsOther | [3] |  |
Balance, End of Period | $ 39,869 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations |  | $ 46,755 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations |  | $ 49,392 ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations |
[1] | Includes charges for newly vacated spaces and subsequent adjustments for accretion, revised estimates, and variances between estimated and actual charges, net of any reversals for terminated lease obligations.
[2] | See Note 8 "Leases" for the future minimum lease payments under operating leases for discontinued operations as of December 31, 2014.
[3] | Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that are netted with the losses incurred in the period recorded.

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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 For the disposal group, including a component of the entity (discontinued operation), the change in the liability during the period for remaining lease obligations related to charges for newly vacated space, subsequent adjustments for accretion, revised estimates and variances between estimated and actual charges. + References No definition available. + Details
Name: | ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurred
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

X
- Definition For the disposal group, including a component of the entity (discontinued operation), the net change during the period for remaining lease obligations related to transfer of existing deferred rent liability balances for newly vacated spaces that offset the losses incurred in the period recorded. + References No definition available. + Details
Name: | ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsOther
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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