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Summary of Revenue by Segment and Business Line (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 899,869 $ 913,386 $ 2,635,323 $ 2,655,765
Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue 565,231 561,747 1,639,532 1,634,883
Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue 163,744 171,447 502,564 506,345
Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue 170,894 180,192 493,227 514,537
Operating Segments [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 680,559 691,835 2,010,453 2,027,293
Operating Segments [Member] | Hub [Member] | Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue 459,921 460,935 1,345,776 1,352,130
Operating Segments [Member] | Hub [Member] | Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue 83,828 84,208 266,187 254,582
Operating Segments [Member] | Hub [Member] | Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue 136,810 146,692 398,490 420,581
Operating Segments [Member] | Mode [Member]        
Segment Reporting Information [Line Items]        
Revenue 239,375 245,421 686,744 685,865
Operating Segments [Member] | Mode [Member] | Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue 124,009 123,438 352,822 337,618
Operating Segments [Member] | Mode [Member] | Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue 80,612 87,420 237,655 252,480
Operating Segments [Member] | Mode [Member] | Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue 34,754 34,563 96,267 95,767
Intersegment Elims [Member]        
Segment Reporting Information [Line Items]        
Revenue (20,065) (23,870) (61,874) (57,393)
Intersegment Elims [Member] | Intermodal [Member]        
Segment Reporting Information [Line Items]        
Revenue (18,699) (22,626) (59,066) (54,865)
Intersegment Elims [Member] | Truck brokerage [Member]        
Segment Reporting Information [Line Items]        
Revenue (696) (181) (1,278) (717)
Intersegment Elims [Member] | Logistics [Member]        
Segment Reporting Information [Line Items]        
Revenue $ (670) $ (1,063) $ (1,530) $ (1,811)