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Property and Equipment - Schedule of Cost Basis and Estimated Useful Lives of Property and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Computer hardware and software $ 105,175 $ 105,244
Leasehold improvements 73,951 90,486
Furniture, fixtures and equipment 37,362 40,464
Building and improvements 8,578 8,578
Library materials 982 1,522
Vehicles 107 464
Construction in progress 1,945 297
Property plant and equipment, Total 228,100 247,055
Less-accumulated depreciation (198,052) (213,825)
Total property and equipment, net $ 30,048 $ 33,230
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