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Summary of Operating Results (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Revenue $ 801,023 $ 804,888 $ 778,312 $ 739,885 $ 762,775 $ 752,179 $ 751,201 $ 485,379 $ 3,124,108 $ 2,751,534 $ 1,833,737
Transportation costs                 2,768,042 2,438,986 1,620,304
Gross margin 93,379 91,587 87,358 83,742 83,811 86,701 84,729 57,307 356,066 312,548 213,433
Costs and expenses:                      
Salaries and benefits                 129,143 121,044 99,138
Agent fees and commissions                 55,112 41,491 2,410
General and administrative                 52,832 49,951 38,211
Depreciation and amortization                 6,619 5,603 3,792
Total costs and expenses                 243,706 218,089 143,551
Operating income 31,648 30,351 27,850 22,511 27,138 26,643 23,918 16,760 112,360 94,459 69,882
Capital expenditures                 56,882 55,010 25,616
Hub
                      
Segment Reporting Information [Line Items]                      
Revenue                 2,392,289 2,183,914 1,833,737
Transportation costs                 2,128,942 1,939,263 1,620,304
Gross margin                 263,347 244,651 213,433
Costs and expenses:                      
Salaries and benefits                 113,855 107,378 99,138
Agent fees and commissions                 1,900 2,771 2,410
General and administrative                 45,411 42,523 38,211
Depreciation and amortization                 4,448 3,975 3,792
Total costs and expenses                 165,614 156,647 143,551
Operating income                 97,733 88,004 69,882
Capital expenditures                 54,266 54,683 25,616
Mode
                      
Segment Reporting Information [Line Items]                      
Revenue                 779,928 586,251  
Transportation costs                 687,209 518,354  
Gross margin                 92,719 67,897  
Costs and expenses:                      
Salaries and benefits                 15,288 13,666  
Agent fees and commissions                 53,212 38,720  
General and administrative                 7,421 7,428  
Depreciation and amortization                 2,171 1,628  
Total costs and expenses                 78,092 61,442  
Operating income                 14,627 6,455  
Capital expenditures                 2,616 327  
Intersegment Elims
                      
Segment Reporting Information [Line Items]                      
Revenue                 (48,109) (18,631)  
Transportation costs                 $ (48,109) $ (18,631)