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Summary of Revenue by Segment and Business Line (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Revenue by segment and business line $ 804,888 $ 752,179 $ 2,323,085 $ 1,988,759
Intermodal
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 524,072 483,908 1,508,234 1,291,348
Truck Brokerage
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 166,811 164,179 486,703 419,350
Logistics
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 114,005 104,092 328,148 278,061
Hub
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 619,336 560,810 1,778,436 1,606,607
Hub | Intermodal
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 444,760 401,759 1,280,825 1,134,738
Hub | Truck Brokerage
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 87,782 83,116 247,900 257,566
Hub | Logistics
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 86,794 75,935 249,711 214,303
Mode
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 199,903 197,761 581,378 391,009
Mode | Intermodal
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 92,552 87,852 260,823 164,405
Mode | Truck Brokerage
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 79,746 81,452 241,062 162,546
Mode | Logistics
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 27,605 28,457 79,493 64,058
Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line (14,351) (6,392) (36,729) (8,857)
Intersegment, Elims | Intermodal
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line (13,240) (5,703) (33,414) (7,795)
Intersegment, Elims | Truck Brokerage
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line (717) (389) (2,259) (762)
Intersegment, Elims | Logistics
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line $ (394) $ (300) $ (1,056) $ (300)