XML 25 R24.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Operating Results (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Revenue $ 804,888 $ 752,179 $ 2,323,085 $ 1,988,759
Transportation costs 713,301 665,478 2,060,398 1,760,022
Gross margin 91,587 86,701 262,687 228,737
Costs and expenses:        
Salaries and benefits 31,385 32,002 96,120 91,525
Agent fees and commissions 13,810 13,884 41,106 28,400
General and administrative 14,430 12,612 39,741 37,523
Depreciation and amortization 1,611 1,560 5,008 3,968
Total costs and expenses 61,236 60,058 181,975 161,416
Operating income 30,351 26,643 80,712 67,321
Capital expenditures 13,628 20,101 34,671 35,382
Hub
        
Segment Reporting Information [Line Items]        
Revenue 619,336 560,810 1,778,436 1,606,607
Transportation costs 552,071 497,204 1,584,844 1,423,108
Gross margin 67,265 63,606 193,592 183,499
Costs and expenses:        
Salaries and benefits 27,852 26,884 84,523 81,796
Agent fees and commissions 401 660 1,526 2,049
General and administrative 12,566 10,141 34,004 32,464
Depreciation and amortization 1,118 1,003 3,338 2,890
Total costs and expenses 41,937 38,688 123,391 119,199
Operating income 25,328 24,918 70,201 64,300
Capital expenditures 11,853 19,996 32,175 35,250
Mode
        
Segment Reporting Information [Line Items]        
Revenue 199,903 197,761 581,378 391,009
Transportation costs 175,581 174,666 512,283 345,771
Gross margin 24,322 23,095 69,095 45,238
Costs and expenses:        
Salaries and benefits 3,533 5,118 11,597 9,729
Agent fees and commissions 13,409 13,224 39,580 26,351
General and administrative 1,864 2,471 5,737 5,059
Depreciation and amortization 493 557 1,670 1,078
Total costs and expenses 19,299 21,370 58,584 42,217
Operating income 5,023 1,725 10,511 3,021
Capital expenditures 1,775 105 2,496 132
Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue (14,351) (6,392) (36,729) (8,857)
Transportation costs $ (14,351) $ (6,392) $ (36,729) $ (8,857)