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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,007,222 $ 812,562
Less accumulated depreciation and amortization (174,557) (145,079)
Property and equipment, net 832,665 667,483
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 126,046 103,280
Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 21,573 13,389
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 501,208 392,754
Building and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 94,300 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 101,409 91,225
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 56,021 51,352
Internally Developed Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 28,826 25,996
Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,176 1,099
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 70,720 $ 54,506