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Share-Based Compensation - Schedule of Restricted Stock Units to be Settled in Cash (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Beginning balance of Outstanding, Stock Units to be Settled in Cash 2,288,915ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonVestedNumberSettledInCash  
Stock Units to be Settled in Cash, Granted 981,136ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodSettledInCash 2,938,283ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodSettledInCash
Stock Units to be Settled in Cash, Vested (755,656)ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedSettledInCash  
Stock Units to be Settled in Cash, Forfeited (671,940)ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedSettledInCash (649,368)ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedSettledInCash
Ending balance of Outstanding, Stock Units to be Settled in Cash 1,842,455ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonVestedNumberSettledInCash 2,288,915ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonVestedNumberSettledInCash