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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]    
Balance, Beginning of Period $ 39,869ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations $ 46,755ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations
Charges Incurred (486)ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurred [1] 7,319ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsIncurred [1]
Net Cash Payments (5,942)ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsNetCashPayments (6,764)ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsNetCashPayments
Other   3,435ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligationsOther [2]
Balance, End of Period $ 33,441ceco_DisposalGroupIncludingDiscontinuedOperationRemainingLeaseObligations $ 50,745ceco_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] Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that are netted with the losses incurred in the period recorded.