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Summary of Operating Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Revenue $ 890,272 $ 899,869 $ 899,513 $ 835,941 $ 915,361 $ 913,386 $ 893,930 $ 848,449 $ 3,525,595 $ 3,571,126 $ 3,373,898
Transportation costs                 3,112,900 3,200,691 3,002,875
Gross margin 116,774 105,064 101,729 89,128 89,910 93,196 98,585 88,744 412,695 370,435 371,023
Costs and expenses:                      
Salaries and benefits                 158,938 136,480 135,341
Agent fees and commissions                 68,724 62,041 55,789
General and administrative                 60,015 58,014 56,772
Depreciation and amortization                 7,988 7,799 6,470
Driver settlements and related costs                   10,343  
Impairment of software                   11,881  
Total costs and expenses                 295,665 286,558 257,276
Impairment of trade name                     2,904
Operating income $ 35,341 $ 33,418 $ 29,476 $ 18,795 $ 24,777 $ 7,677 $ 30,927 $ 20,496 117,030 83,877 113,747
Capital expenditures                 83,042 119,171 110,917
Operating Segments [Member] | Hub [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 2,679,318 2,722,799 2,599,763
Transportation costs                 2,385,197 2,461,144 2,325,512
Gross margin                 294,121 261,655 274,251
Costs and expenses:                      
Salaries and benefits                 143,993 122,097 120,478
Agent fees and commissions                 56 45 1,372
General and administrative                 53,023 51,108 50,484
Depreciation and amortization                 6,688 6,238 4,326
Driver settlements and related costs                   10,343  
Impairment of software                   11,881  
Total costs and expenses                 203,760 201,712 179,564
Impairment of trade name                     2,904
Operating income                 90,361 59,943 94,687
Capital expenditures                 79,860 118,640 109,412
Operating Segments [Member] | Mode [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 928,661 931,131 823,159
Transportation costs                 810,087 822,351 726,387
Gross margin                 118,574 108,780 96,772
Costs and expenses:                      
Salaries and benefits                 14,945 14,383 14,863
Agent fees and commissions                 68,668 61,996 54,417
General and administrative                 6,992 6,906 6,288
Depreciation and amortization                 1,300 1,561 2,144
Total costs and expenses                 91,905 84,846 77,712
Operating income                 26,669 23,934 19,060
Capital expenditures                 3,182 531 1,505
Intersegment Elims [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 (82,384) (82,804) (49,024)
Transportation costs                 $ (82,384) $ (82,804) $ (49,024)