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Summary of Operating Results (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Revenue $ 778,312 $ 751,201 $ 1,518,197 $ 1,236,580
Transportation costs 690,954 666,472 1,347,097 1,094,544
Gross margin 87,358 84,729 171,100 142,036
Costs and expenses:        
Salaries and benefits 31,436 32,722 64,735 59,523
Agent fees and commissions 13,601 13,765 27,296 14,516
General and administrative 12,734 12,852 25,311 24,911
Depreciation and amortization 1,737 1,472 3,397 2,408
Total costs and expenses 59,508 60,811 120,739 101,358
Operating income 27,850 23,918 50,361 40,678
Capital expenditures 4,030 10,401 21,043 15,281
Hub
        
Segment Reporting Information [Line Items]        
Revenue 595,888 560,418 1,159,100 1,045,797
Transportation costs 531,080 497,832 1,032,773 925,904
Gross margin 64,808 62,586 126,327 119,893
Costs and expenses:        
Salaries and benefits 27,590 28,111 56,671 54,912
Agent fees and commissions 490 638 1,125 1,389
General and administrative 10,707 10,264 21,438 22,323
Depreciation and amortization 1,099 951 2,221 1,887
Total costs and expenses 39,886 39,964 81,455 80,511
Operating income 24,922 22,622 44,872 39,382
Capital expenditures 3,580 10,374 20,322 15,254
Mode
        
Segment Reporting Information [Line Items]        
Revenue 194,292 193,248 381,475 193,248
Transportation costs 171,742 171,105 336,702 171,105
Gross margin 22,550 22,143 44,773 22,143
Costs and expenses:        
Salaries and benefits 3,846 4,611 8,064 4,611
Agent fees and commissions 13,111 13,127 26,171 13,127
General and administrative 2,027 2,588 3,873 2,588
Depreciation and amortization 638 521 1,176 521
Total costs and expenses 19,622 20,847 39,284 20,847
Operating income 2,928 1,296 5,489 1,296
Capital expenditures 450 27 721 27
Intersegment, Elims
        
Segment Reporting Information [Line Items]        
Revenue (11,868) (2,465) (22,378) (2,465)
Transportation costs $ (11,868) $ (2,465) $ (22,378) $ (2,465)