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Restructuring Charges - Schedule of Changes in Future Minimum Lease Obligations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Restructuring And Related Activities [Abstract] |  |  |  |  |
Balance, Beginning of Period |  | $ 15,843 | $ 34,410 | $ 20,763 | $ 36,814
Charges Incurred | [1] | 5,165 | 749 | 5,597 | 5,206
Net Cash Payments |  | (6,722) | (8,403) | (12,074) | (14,402)
Other | [2] | 41 | 353 | 41 | (509)
Balance, End of Period |  | $ 14,327 | $ 27,109 | $ 14,327 | $ 27,109
[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] | Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that offset the losses incurred in the period recorded.

X
- Definition The present value of remaining lease obligations recorded at the time a facility is vacated. + References No definition available. + Details
Name: | ceco_RemainingLeaseObligations
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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_RemainingLeaseObligationsIncurred
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease during the period for remaining lease obligations related to cash payments for vacated facilities. + References No definition available. + Details
Name: | ceco_RemainingLeaseObligationsNetCashPayments
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition 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_RemainingLeaseObligationsOther
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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