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Summary of Revenue by Segment and Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Revenue $ 890,272 $ 899,869 $ 899,513 $ 835,941 $ 915,361 $ 913,386 $ 893,930 $ 848,449 $ 3,525,595 $ 3,571,126 $ 3,373,898
Intermodal [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 2,197,268 2,203,295 2,160,947
Truck brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 667,992 673,231 643,504
Logistics [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 660,335 694,600 569,447
Operating Segments [Member] | Hub [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 2,679,318 2,722,799 2,599,763
Operating Segments [Member] | Hub [Member] | Intermodal [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 1,792,046 1,815,842 1,818,162
Operating Segments [Member] | Hub [Member] | Truck brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 355,402 338,590 333,027
Operating Segments [Member] | Hub [Member] | Logistics [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 531,870 568,367 448,574
Operating Segments [Member] | Mode [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 928,661 931,131 823,159
Operating Segments [Member] | Mode [Member] | Intermodal [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 483,910 466,859 389,186
Operating Segments [Member] | Mode [Member] | Truck brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 314,498 335,587 311,930
Operating Segments [Member] | Mode [Member] | Logistics [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 130,253 128,685 122,043
Intersegment Elims [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (82,384) (82,804) (49,024)
Intersegment Elims [Member] | Intermodal [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (78,688) (79,406) (46,401)
Intersegment Elims [Member] | Truck brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (1,908) (946) (1,453)
Intersegment Elims [Member] | Logistics [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 $ (1,788) $ (2,452) $ (1,170)