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Property and Equipment - Schedule of Cost Basis and Estimated Useful Lives of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Leasehold improvements 174,026us-gaap_LeaseholdImprovementsGross $ 182,260us-gaap_LeaseholdImprovementsGross
Computer hardware and software 121,136ceco_ComputerHardwareAndSoftwareGross 134,866ceco_ComputerHardwareAndSoftwareGross
Furniture, fixtures and equipment 90,671ceco_FurnitureFixturesAndEquipmentGross 94,493ceco_FurnitureFixturesAndEquipmentGross
Building and improvements 8,656us-gaap_BuildingsAndImprovementsGross 8,625us-gaap_BuildingsAndImprovementsGross
Library materials 3,840ceco_LibraryMaterialsGross 4,004ceco_LibraryMaterialsGross
Vehicles 778ceco_VehiclesGross 819ceco_VehiclesGross
Construction in progress 372us-gaap_ConstructionInProgressGross 753us-gaap_ConstructionInProgressGross
Property plant and equipment, Total 399,479us-gaap_PropertyPlantAndEquipmentGross 425,820us-gaap_PropertyPlantAndEquipmentGross
Less-Accumulated depreciation (326,396)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (313,725)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net 73,083us-gaap_PropertyPlantAndEquipmentNet $ 112,095us-gaap_PropertyPlantAndEquipmentNet
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) Shorter of Life of Lease or Useful Life  
Computer Hardware and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 3 years  
Furniture, Fixtures and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 5 years  
Furniture, Fixtures and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 10 years  
Building and Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 15 years  
Building and Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 35 years  
Library Materials [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 10 years  
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, estimated useful life (in years) 5 years