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Property and Equipment - Summary of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment $ 424,479 $ 330,401
Less accumulated depreciation and amortization (84,883) (61,239)
Property and equipment, net 339,596 269,162
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 21,820 13,294
Land Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 5,176 3,439
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 222,402 180,945
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 32,243 24,930
Computer Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 64,773 55,734
Furniture, Fixtures and Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 32,583 22,124
Internally Developed Software [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment 15,606 11,039
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 $ 23,467 $ 12,487