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Summary of Revenue by Segment and Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 924,513 $ 855,557 $ 1,817,961 $ 1,661,416
Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue 550,846 532,928 1,082,408 1,041,152
Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue 187,561 164,039 372,018 312,770
Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue 186,106 158,590 363,535 307,494
Operating Segments [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 705,208 648,523 1,382,340 1,263,751
Operating Segments [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 243,051 231,924 484,925 440,755
Operating Segments [Member] | Intermodal [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 451,593 438,133 876,189 851,940
Operating Segments [Member] | Intermodal [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 112,119 116,963 234,322 229,329
Operating Segments [Member] | Truck brokerage [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 104,980 83,140 211,644 164,550
Operating Segments [Member] | Truck brokerage [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 82,891 81,374 161,069 148,722
Operating Segments [Member] | Logistics [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 148,635 127,250 294,507 247,261
Operating Segments [Member] | Logistics [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 48,041 33,587 89,534 62,704
Intersegment Elims [Member]        
Segment Reporting Information [Line Items]        
Revenue (23,746) (24,890) (49,304) (43,090)
Intersegment Elims [Member] | Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue (12,866) (22,168) (28,103) (40,117)
Intersegment Elims [Member] | Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue (310) (475) (695) (502)
Intersegment Elims [Member] | Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue $ (10,570) $ (2,247) $ (20,506) $ (2,471)