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Quarterly Financial Summary (Unaudited) - Schedule of Quarterly Financial Summary (Parenthetical) (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 03, 2013
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Schedule Of Quarterly Financial Summary [Line Items]                      
Trade name impairment charges   $ 14,200,000ceco_IntangibleAssetImpairmentCharges $ 3,000,000ceco_IntangibleAssetImpairmentCharges     $ 4,000,000ceco_IntangibleAssetImpairmentCharges   $ 14,200,000ceco_IntangibleAssetImpairmentCharges      
Loss on sale of business             6,700,000us-gaap_GainLossOnSaleOfBusiness   (6,905,000)us-gaap_GainLossOnSaleOfBusiness    
Goodwill and asset impairment charges, discontinued operations   10,300,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge 1,500,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge 1,000,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge 10,700,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge 2,300,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge   10,300,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge 1,000,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge   7,400,000ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge
Decrease in revenue   9,400,000ceco_CumulativeAdjustmentRelatedToChangeInAccountingMethodologyForRevenueRecognition                  
Expense for bad debts   7,500,000ceco_CumulativeAdjustmentRelatedToChangeInAccountingMethodologyForBadDebtExpense                  
Loss from Discontinuing Operations   500,000ceco_CumulativeAdjustmentRelatedToChangeInAccountingMethodologyForIncomeLossFromDiscontinuingOperations                  
Valuation allowances against deferred tax assets   71,800,000us-gaap_DeferredTaxAssetsValuationAllowance   72,200,000us-gaap_DeferredTaxAssetsValuationAllowance       71,800,000us-gaap_DeferredTaxAssetsValuationAllowance 72,200,000us-gaap_DeferredTaxAssetsValuationAllowance    
Amount from legal settlement       15,500,000ceco_PendingLitigationSettlementAmount              
Asset impairment charges     11,500,000us-gaap_AssetImpairmentCharges 7,000,000us-gaap_AssetImpairmentCharges       16,898,000us-gaap_AssetImpairmentCharges 8,681,000us-gaap_AssetImpairmentCharges 86,606,000us-gaap_AssetImpairmentCharges  
Realized gain on sale 130,100,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax                    
Insurance recovery     8,600,000us-gaap_InsuranceRecoveries                
Goodwill and asset impairment charges         11,600,000us-gaap_GoodwillAndIntangibleAssetImpairment 10,000,000us-gaap_GoodwillAndIntangibleAssetImpairment   36,209,000us-gaap_GoodwillAndIntangibleAssetImpairment 22,691,000us-gaap_GoodwillAndIntangibleAssetImpairment 127,007,000us-gaap_GoodwillAndIntangibleAssetImpairment  
International Segment Sale [Member]                      
Schedule Of Quarterly Financial Summary [Line Items]                      
Realized gain on sale       $ 130,100,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_StatementBusinessSegmentsAxis
= ceco_InternationalSegmentSaleMember