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Property and Equipment, net - Summary of Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment $ 350,611 $ 330,401
Less accumulated depreciation and amortization (67,027) (61,239)
Property and equipment, net 283,584 269,162
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 13,770 13,294
Land improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 4,269 3,439
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 182,756 180,945
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 26,567 24,930
Computer equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 57,649 55,734
Furniture, fixtures and equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 23,063 22,124
Internally developed software [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 12,334 11,039
Other [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 1,098 1,099
Construction in progress [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 23,795 $ 12,487