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Summary of Operating Results (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenue $ 885,252 $ 882,981 $ 836,685 $ 768,980 $ 801,023 $ 804,888 $ 778,312 $ 739,885 $ 3,373,898 $ 3,124,108 $ 2,751,534
Transportation costs                 3,002,875 2,768,042 2,438,986
Gross margin 95,088 93,124 95,473 87,338 93,379 91,587 87,358 83,742 371,023 356,066 312,548
Costs and expenses:                      
Salaries and benefits                 135,341 129,143 121,044
Agent fees and commissions                 55,789 55,112 41,491
General and administrative                 56,772 52,832 49,951
Depreciation and amortization                 6,470 6,619 5,603
Impairment of trade name 2,904               2,904    
Total costs and expenses                 257,276 243,706 218,089
Operating income 27,251 31,295 30,464 24,737 31,648 30,351 27,850 22,511 113,747 112,360 94,459
Capital expenditures                 110,917 56,882 55,010
Operating Segments [Member] | Hub [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 2,599,763 2,392,289 2,183,914
Transportation costs                 2,325,512 2,128,942 1,939,263
Gross margin                 274,251 263,347 244,651
Costs and expenses:                      
Salaries and benefits                 120,478 113,855 107,378
Agent fees and commissions                 1,372 1,900 2,771
General and administrative                 50,484 45,411 42,523
Depreciation and amortization                 4,326 4,448 3,975
Impairment of trade name                 2,904    
Total costs and expenses                 179,564 165,614 156,647
Operating income                 94,687 97,733 88,004
Capital expenditures                 109,412 54,266 54,683
Operating Segments [Member] | Mode [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 823,159 779,928 586,251
Transportation costs                 726,387 687,209 518,354
Gross margin                 96,772 92,719 67,897
Costs and expenses:                      
Salaries and benefits                 14,863 15,288 13,666
Agent fees and commissions                 54,417 53,212 38,720
General and administrative                 6,288 7,421 7,428
Depreciation and amortization                 2,144 2,171 1,628
Total costs and expenses                 77,712 78,092 61,442
Operating income                 19,060 14,627 6,455
Capital expenditures                 1,505 2,616 327
Intersegment Elims [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 (49,024) (48,109) (18,631)
Transportation costs                 $ (49,024) $ (48,109) $ (18,631)