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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2011
Property, Plant and Equipment [Line Items]        
Property and Equipment, gross $ 990,434 $ 807,817    
Equipment, capital lease obligation       $ 26,400
Equipment, capital lease obligation, net 7,700 10,000    
Depreciation and amortization expense related to property and equipment 77,300 57,800 $ 43,000  
Amortization expense under capital lease obligation 2,200 2,200 $ 2,300  
Transportation Equipment [Member]        
Property, Plant and Equipment [Line Items]        
Property and Equipment, gross 787,187 620,951    
Computer Software and Hardware [Member]        
Property, Plant and Equipment [Line Items]        
Property and Equipment, gross $ 118,723 $ 103,827