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Summary of Operating Results (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 893,930 $ 836,685 $ 1,742,379 $ 1,605,665
Transportation costs 795,345 741,212 1,555,050 1,422,854
Gross margin 98,585 95,473 187,329 182,811
Costs and expenses:        
Salaries and benefits 35,556 35,002 72,648 69,585
Agent fees and commissions 15,544 13,686 29,210 26,960
General and administrative 14,681 14,728 30,113 27,919
Depreciation and amortization 1,877 1,593 3,935 3,146
Total costs and expenses 67,658 65,009 135,906 127,610
Operating income 30,927 30,464 51,423 55,201
Capital expenditures 13,408 29,746 46,443 39,202
Operating Segments [Member] | Hub [Member]
        
Segment Reporting Information [Line Items]        
Revenue 682,049 644,924 1,335,458 1,237,575
Transportation costs 611,351 573,498 1,200,262 1,100,969
Gross margin 70,698 71,426 135,196 136,606
Costs and expenses:        
Salaries and benefits 32,047 31,208 65,384 61,985
Agent fees and commissions 5 350 16 799
General and administrative 12,817 13,338 26,557 25,036
Depreciation and amortization 1,538 1,061 3,055 2,081
Total costs and expenses 46,407 45,957 95,012 89,901
Operating income 24,291 25,469 40,184 46,705
Capital expenditures 13,223 29,626 46,103 38,155
Operating Segments [Member] | Mode [Member]
        
Segment Reporting Information [Line Items]        
Revenue 231,538 203,918 440,444 391,378
Transportation costs 203,651 179,871 388,311 345,173
Gross margin 27,887 24,047 52,133 46,205
Costs and expenses:        
Salaries and benefits 3,509 3,794 7,264 7,600
Agent fees and commissions 15,539 13,336 29,194 26,161
General and administrative 1,864 1,390 3,556 2,883
Depreciation and amortization 339 532 880 1,065
Total costs and expenses 21,251 19,052 40,894 37,709
Operating income 6,636 4,995 11,239 8,496
Capital expenditures 185 120 340 1,047
Intersegment Elims [Member]
        
Segment Reporting Information [Line Items]        
Revenue (19,657) (12,157) (33,523) (23,288)
Transportation costs (19,657) (12,157) (33,523) (23,288)
Gross margin          
Costs and expenses:        
Salaries and benefits          
Agent fees and commissions          
General and administrative          
Depreciation and amortization          
Total costs and expenses          
Operating income          
Capital expenditures