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Summary of Disaggregated Revenue by Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Revenue $ 933,224 $ 824,809 $ 2,665,300 $ 2,213,824
Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue 576,478 478,531 1,597,254 1,362,564
Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue 122,062 112,653 357,016 323,128
Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue 156,041 175,679 498,139 470,186
Dedicated [Member]        
Segment Reporting Information [Line Items]        
Revenue $ 78,643 $ 57,946 $ 212,891 $ 57,946