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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment $ 878,503 $ 812,562
Less accumulated depreciation and amortization (153,412) (145,079)
Property and equipment, net 725,091 667,483
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 113,932 103,280
Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 20,472 13,389
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 396,670 392,754
Building and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 75,232 72,494
Equipment under Capital Leases [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 5,943 6,467
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 92,843 91,225
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 52,158 51,352
Internally Developed Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 25,513 25,996
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,175 1,099
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 94,565 $ 54,506