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Summary of Revenue by Segment and Business Line (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Revenue $ 768,980 $ 739,885
Intermodal [Member]
    
Segment Reporting Information [Line Items]    
Revenue 503,607 477,152
Truck Brokerage [Member]
    
Segment Reporting Information [Line Items]    
Revenue 157,030 158,999
Logistics [Member]
    
Segment Reporting Information [Line Items]    
Revenue 108,343 103,734
Hub [Member]
    
Segment Reporting Information [Line Items]    
Revenue 592,651 563,212
Hub [Member] | Intermodal [Member]
    
Segment Reporting Information [Line Items]    
Revenue 427,334 404,171
Hub [Member] | Truck Brokerage [Member]
    
Segment Reporting Information [Line Items]    
Revenue 83,560 80,024
Hub [Member] | Logistics [Member]
    
Segment Reporting Information [Line Items]    
Revenue 81,757 79,017
Mode [Member]
    
Segment Reporting Information [Line Items]    
Revenue 187,460 187,183
Mode [Member] | Intermodal [Member]
    
Segment Reporting Information [Line Items]    
Revenue 86,736 82,223
Mode [Member] | Truck Brokerage [Member]
    
Segment Reporting Information [Line Items]    
Revenue 73,933 79,937
Mode [Member] | Logistics [Member]
    
Segment Reporting Information [Line Items]    
Revenue 26,791 25,023
Intersegment Elims [Member]
    
Segment Reporting Information [Line Items]    
Revenue (11,131) (10,510)
Intersegment Elims [Member] | Intermodal [Member]
    
Segment Reporting Information [Line Items]    
Revenue (10,463) (9,242)
Intersegment Elims [Member] | Truck Brokerage [Member]
    
Segment Reporting Information [Line Items]    
Revenue (463) (962)
Intersegment Elims [Member] | Logistics [Member]
    
Segment Reporting Information [Line Items]    
Revenue $ (205) $ (306)