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Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 162,914 $ 170,893
Less: accumulated depreciation and amortization (97,250) (93,041)
Property and equipment, net 65,664 77,852
Transportation Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 48,879 48,906
Computer Equipment And Purchased Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 64,615 72,602
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 11,649 11,477
Leaseholds and Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 28,211 28,500
Software Development    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 9,560 $ 9,408