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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 990,434 $ 807,817
Less: Accumulated depreciation and amortization (308,575) (246,603)
Property and Equipment, net 681,859 561,214
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 24,708 24,708
Building And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 36,644 36,459
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 7,252 6,232
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 118,723 103,827
Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 14,421 14,180
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 787,187 620,951
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 1,499 $ 1,460