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Business Segments (Summary Of Operating Results) (Details) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenue $ 759,709 $ 458,113 $ 1,245,088 $ 875,407
Transportation costs 674,956 407,537 1,103,028 776,013
Gross margin 84,753 50,576 142,060 99,394
Salaries and benefits 32,746 23,863 59,547 47,321
Agent fees and commissions 13,765 584 14,516 1,133
General and administrative 12,852 9,480 24,911 19,076
Depreciation and amortization 1,472 934 2,408 1,907
Total costs and expenses 60,835 34,861 101,382 69,437
Operating income 23,918 15,715 40,678 29,957
Capital expenditures 10,401 1,404 15,281 2,051
Mode [Member]
        
Revenue 201,756   201,756  
Transportation costs 179,589   179,589  
Gross margin 22,167   22,167  
Salaries and benefits 4,635   4,635  
Agent fees and commissions 13,127   13,127  
General and administrative 2,588   2,588  
Depreciation and amortization 521   521  
Total costs and expenses 20,871   20,871  
Operating income 1,296   1,296  
Capital expenditures 27   27  
Interco Elims [Member]
        
Revenue (2,465)   (2,465)  
Transportation costs (2,465)   (2,465)  
Gross margin        
Salaries and benefits        
Agent fees and commissions        
General and administrative        
Depreciation and amortization        
Total costs and expenses        
Operating income        
Capital expenditures        
Hub [Member]
        
Revenue 560,418 458,113 1,045,797 875,407
Transportation costs 497,832 407,537 925,904 776,013
Gross margin 62,586 50,576 119,893 99,394
Salaries and benefits 28,111 23,863 54,912 47,321
Agent fees and commissions 638 584 1,389 1,133
General and administrative 10,264 9,480 22,323 19,076
Depreciation and amortization 951 934 1,887 1,907
Total costs and expenses 39,964 34,861 80,511 69,437
Operating income 22,622 15,715 39,382 29,957
Capital expenditures $ 10,374 $ 1,404 $ 15,254 $ 2,051