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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 546,010 $ 479,013
Less: Accumulated depreciation and amortization (171,163) (140,686)
Property and Equipment, net 374,847 338,327
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 9,855 9,855
Building And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 35,267 35,212
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 4,419 4,241
Computer Equipment And Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 77,887 70,719
Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 13,260 12,931
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 405,322 $ 346,055