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Business Segments (Schedule Of Revenue By Segment And Business Line) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue $ 762,775 $ 752,179 $ 751,201 $ 485,379 $ 479,913 $ 478,417 $ 458,113 $ 417,294 $ 2,751,534 $ 1,833,737 $ 1,510,970
Hub [Member]
                      
Revenue                 2,183,914 1,833,737 1,510,970
Mode [Member]
                      
Revenue                 586,251    
Inter-Segment Elims [Member]
                      
Revenue                 (18,631)    
Intermodal [Member]
                      
Revenue                 1,795,289 1,285,163 1,054,862
Intermodal [Member] | Hub [Member]
                      
Revenue                 1,553,594 1,285,163 1,054,862
Intermodal [Member] | Mode [Member]
                      
Revenue                 258,087    
Intermodal [Member] | Inter-Segment Elims [Member]
                      
Revenue                 (16,392)    
Truck Brokerage [Member]
                      
Revenue                 576,829 335,000 292,639
Truck Brokerage [Member] | Hub [Member]
                      
Revenue                 339,444 335,000 292,639
Truck Brokerage [Member] | Mode [Member]
                      
Revenue                 238,418    
Truck Brokerage [Member] | Inter-Segment Elims [Member]
                      
Revenue                 (1,033)    
Logistics [Member]
                      
Revenue                 379,416 213,574 163,469
Logistics [Member] | Hub [Member]
                      
Revenue                 290,876 213,574 163,469
Logistics [Member] | Mode [Member]
                      
Revenue                 89,746    
Logistics [Member] | Inter-Segment Elims [Member]
                      
Revenue                 $ (1,206)