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Summary of Revenue by Segment and Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 1,054,360 $ 932,814 $ 2,872,321 $ 2,594,230
Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue 583,527 570,478 1,665,935 1,611,628
Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue 199,787 176,359 571,804 489,130
Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue 213,145 185,977 576,681 493,472
Dedicated [Member]        
Segment Reporting Information [Line Items]        
Revenue 57,901   57,901  
Operating Segments [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 820,802 716,699 2,203,142 1,980,450
Operating Segments [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 258,696 251,611 743,621 692,366
Operating Segments [Member] | Intermodal [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 473,998 466,283 1,350,187 1,318,223
Operating Segments [Member] | Intermodal [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 123,194 126,052 357,516 355,379
Operating Segments [Member] | Truck brokerage [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 113,179 96,906 324,823 261,456
Operating Segments [Member] | Truck brokerage [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 87,242 79,627 248,311 228,350
Operating Segments [Member] | Logistics [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 175,679 153,510 470,186 400,771
Operating Segments [Member] | Logistics [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 48,260 45,932 137,794 108,637
Operating Segments [Member] | Dedicated [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 57,946   57,946  
Intersegment Elims [Member]        
Segment Reporting Information [Line Items]        
Revenue (25,138) (35,496) (74,442) (78,586)
Intersegment Elims [Member] | Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue (13,665) (21,857) (41,768) (61,974)
Intersegment Elims [Member] | Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue (634) (174) (1,330) (676)
Intersegment Elims [Member] | Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue (10,794) $ (13,465) (31,299) $ (15,936)
Intersegment Elims [Member] | Dedicated [Member]        
Segment Reporting Information [Line Items]        
Revenue $ (45)   $ (45)