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Property and Equipment - Summary of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property and equipment $ 330,401 $ 230,407
Less accumulated depreciation and amortization (61,239) (40,460)
Property and equipment, net 269,162 189,947
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 13,294 9,504
Land improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 3,439 1,688
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 180,945 118,445
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 24,930 17,305
Computer equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 55,734 46,993
Furniture, fixtures and equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 22,124 13,366
Internally developed software [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 11,039 7,108
Other [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,099 1,098
Construction in progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 12,487 $ 9,590