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Business Segments (Summary Of Operating Results) (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
Segment Reporting Information [Line Items]                      
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
Transportation costs                 2,438,986 1,620,304 1,325,280
Gross margin 83,811 86,701 84,729 57,307 56,642 57,397 50,576 48,818 312,548 213,433 185,690
Salaries and benefits                 121,044 99,138 88,518
Agent fees and commissions                 41,491 2,410 1,287
General and administrative                 49,951 38,211 36,180
Depreciation and amortization                 5,603 3,792 4,174
Total costs and expenses                 218,089 143,551 130,159
Operating income 27,138 26,643 23,918 16,760 19,218 20,707 15,715 14,242 94,459 69,882 55,531
Capital expenditures                 55,010 25,616 4,246
Hub [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 2,183,914 1,833,737 1,510,970
Transportation costs                 1,939,263 1,620,304 1,325,280
Gross margin                 244,651 213,433 185,690
Salaries and benefits                 107,378 99,138 88,518
Agent fees and commissions                 2,771 2,410 1,287
General and administrative                 42,523 38,211 36,180
Depreciation and amortization                 3,975 3,792 4,174
Total costs and expenses                 156,647 143,551 130,159
Operating income                 88,004 69,882 55,531
Capital expenditures                 54,683 25,616 4,246
Mode [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 586,251    
Transportation costs                 518,354    
Gross margin                 67,897    
Salaries and benefits                 13,666    
Agent fees and commissions                 38,720    
General and administrative                 7,428    
Depreciation and amortization                 1,628    
Total costs and expenses                 61,442    
Operating income                 6,455    
Capital expenditures                 327    
Inter-Segment Elims [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 (18,631)    
Transportation costs                 $ (18,631)