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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issuable upon exercise of outstanding options 3,781,964us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 3,900,435us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   2,591,887us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 3,353,462us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 598,892us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 760,183us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber   1,998,224us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,796,747us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Number of shares to reduce shares available to grant by upon vesting of deferred stock units 116,952ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsNonvestedNumber 0ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsNonvestedNumber      
Estimated pretax compensation expense $ 5.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized        
Estimated pretax compensation expenses expiration, years 4 years        
Service period in years 4 years        
Restricted stock awards settled in stock exercisable in percentage 25.00%ceco_RestrictedStockAwardsExercisableInPercentage        
Restricted stock awards settled in cash exercisable in percentage 25.00%ceco_RestrictedStockUnitsToBeSettledInCashExercisableInPercentage        
Stock compensation and recognized liability 4.8ceco_ExpenseForRestrictedStockUnitsSettledInCash        
Long-term incentive, cash-based awards 3 years        
Performance unit award expenses $ 3.5ceco_PerformanceUnitAwardsExpense $ 1.1ceco_PerformanceUnitAwardsExpense      
Volatility assumptions for estimating the fair value of stock options minimum 72.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum        
Volatility assumptions for estimating the fair value of stock options maximum 74.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum        
2008 Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock subject to awards of stock options or stock appreciation rights payable in shares 1.0ceco_CommonStockSubjectToAwardsOfStockOptionsOrStockAppreciationRightsPayableInShares
/ us-gaap_PlanNameAxis
= ceco_TwoThousandAndEightIncentiveCompensationPlanMember
       
Common stock subject to any other form of award 1.67ceco_CommonStockSubjectToAnyFormOfAwardsOtherThanStockOptionsOrStockAppreciationRightsPayableInShares
/ us-gaap_PlanNameAxis
= ceco_TwoThousandAndEightIncentiveCompensationPlanMember
       
Common stock available for future share-based awards 6,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ceco_TwoThousandAndEightIncentiveCompensationPlanMember
       
Shares issuable upon exercise of outstanding options 3,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= ceco_TwoThousandAndEightIncentiveCompensationPlanMember
       
Non-Employee Directors' Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period in years 10 years        
Vesting period in years 4        
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock options exercisable in percentage 25.00%ceco_EmployeeStockOptionsExercisableInPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
       
Service period in years 4 years        
Expiration period in years 10 years        
Restricted Stock Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 42,752us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
221,562us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  854,291us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,796,747us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Service period in years 4 years        
Deferred Stock Units to be Settled in Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Service period in years     3 years    
Restricted Stock Units RSU [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares to reduce shares available to grant by upon vesting of restricted stock units 556,140us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
538,621us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  1,143,933us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember