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Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Depreciation expense for continuing operations $ 35.2us-gaap_Depreciation $ 44.0us-gaap_Depreciation $ 47.1us-gaap_Depreciation
Depreciation expense for discontinued operations 19.4ceco_DisposalGroupIncludingDiscontinuedOperationDepreciationExpenses 27.8ceco_DisposalGroupIncludingDiscontinuedOperationDepreciationExpenses 32.3ceco_DisposalGroupIncludingDiscontinuedOperationDepreciationExpenses
Property and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Asset impairment charges $ 14.7us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ceco_PropertyAndEquipmentMember
$ 7.0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ceco_PropertyAndEquipmentMember