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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 1,033,711 $ 990,434
Less: Accumulated depreciation and amortization (370,546) (308,575)
Property and Equipment, net 663,165 681,859
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 36,602 36,644
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 7,300 7,252
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 132,413 118,723
Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 14,057 14,421
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 800,300 787,187
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 18,331 $ 1,499