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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,118,021 $ 1,040,375
Less accumulated depreciation and amortization (220,481) (184,847)
Property and equipment, net 897,540 855,528
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 142,013 127,769
Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 25,119 23,158
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 593,913 559,791
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 116,935 105,168
Equipment under Capital Leases [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 5,937 5,943
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 116,650 108,551
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 62,651 59,300
Internally Developed Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 34,729 30,407
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,176 1,176
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 18,898 $ 19,112