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Business Segments (Summary Of Operating Results) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting Information [Line Items]    
Revenue $ 739,885 $ 485,379
Transportation costs 656,143 428,072
Gross margin 83,742 57,307
Salaries and benefits 33,299 26,801
Agent fees and commissions 13,695 751
General and administrative 12,577 12,059
Depreciation and amortization 1,660 936
Total costs and expenses 61,231 40,547
Operating income 22,511 16,760
Capital expenditures 17,013 4,880
Hub [Member]
    
Segment Reporting Information [Line Items]    
Revenue 563,212 485,379
Transportation costs 501,694 428,072
Gross margin 61,518 57,307
Salaries and benefits 29,080 26,801
Agent fees and commissions 634 751
General and administrative 10,732 12,059
Depreciation and amortization 1,121 936
Total costs and expenses 41,567 40,547
Operating income 19,951 16,760
Capital expenditures 16,742 4,880
Mode [Member]
    
Segment Reporting Information [Line Items]    
Revenue 187,183   
Transportation costs 164,959   
Gross margin 22,224   
Salaries and benefits 4,219   
Agent fees and commissions 13,061   
General and administrative 1,845   
Depreciation and amortization 539   
Total costs and expenses 19,664   
Operating income 2,560   
Capital expenditures 271   
Inter-Segment Elims [Member]
    
Segment Reporting Information [Line Items]    
Revenue (10,510)   
Transportation costs (10,510)   
Gross margin     
Salaries and benefits     
Agent fees and commissions     
General and administrative     
Depreciation and amortization     
Total costs and expenses     
Operating income     
Capital expenditures