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Summary of Revenue by Segment and Business Line (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Revenue by segment and business line $ 778,312 $ 751,201 $ 1,518,197 $ 1,236,580
Hub
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 595,888 560,418 1,159,100 1,045,797
Mode
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 194,292 193,248 381,475 193,248
Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line (11,868) (2,465) (22,378) (2,465)
Intermodal
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 507,011 479,356 984,161 816,037
Intermodal | Hub
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 431,894 396,298 836,064 732,979
Intermodal | Mode
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 86,048 85,150 168,270 85,150
Intermodal | Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line (10,931) (2,092) (20,173) (2,092)
Truck Brokerage
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 160,892 170,571 319,891 255,257
Truck Brokerage | Hub
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 80,094 89,764 160,118 174,450
Truck Brokerage | Mode
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 81,379 81,180 161,316 81,180
Truck Brokerage | Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line (581) (373) (1,543) (373)
Logistics
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 110,409 101,274 214,145 165,286
Logistics | Hub
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 83,900 74,356 162,918 138,368
Logistics | Mode
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line 26,865 26,918 51,889 26,918
Logistics | Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue by segment and business line $ (356)   $ (662)