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Property and Equipment, net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment $ 774,888 $ 591,383
Less accumulated depreciation and amortization (135,257) (113,213)
Property and equipment, net 639,631 478,170
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 94,735 76,537
Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 10,864 8,800
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 387,988 298,124
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 69,071 45,855
Equipment under Capital Leases [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 5,568 5,310
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 87,999 75,990
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 50,219 38,162
Internally Developed Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 24,569 20,813
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,099 1,099
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 42,776 $ 20,693