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Property and Equipment - Summary of Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment $ 574,648 $ 424,479
Less accumulated depreciation and amortization (105,354) (84,883)
Property and equipment, net 469,294 339,596
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 67,139 21,820
Land Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 7,968 5,176
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 290,951 222,402
Equipment under Capital Leases [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 5,310 5,310
Leasehold Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 44,380 32,243
Computer Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 74,136 64,773
Furniture, Fixtures and Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 37,050 32,583
Internally Developed Software [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 19,464 15,606
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 $ 27,151 $ 23,467