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Summary of Operating Results (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Revenue $ 848,449 $ 768,980
Transportation costs 759,705 681,642
Gross margin 88,744 87,338
Costs and expenses:    
Salaries and benefits 37,092 34,583
Agent fees and commissions 13,666 13,274
General and administrative 15,432 13,191
Depreciation and amortization 2,058 1,553
Total costs and expenses 68,248 62,601
Operating income 20,496 24,737
Capital expenditures 33,035 9,456
Operating Segments [Member] | Hub [Member]
    
Segment Reporting Information [Line Items]    
Revenue 653,409 592,651
Transportation costs 588,912 527,471
Gross margin 64,497 65,180
Costs and expenses:    
Salaries and benefits 33,337 30,777
Agent fees and commissions 11 449
General and administrative 13,739 11,698
Depreciation and amortization 1,517 1,020
Total costs and expenses 48,604 43,944
Operating income 15,893 21,236
Capital expenditures 32,880 8,529
Operating Segments [Member] | Mode [Member]
    
Segment Reporting Information [Line Items]    
Revenue 208,906 187,460
Transportation costs 184,659 165,302
Gross margin 24,247 22,158
Costs and expenses:    
Salaries and benefits 3,755 3,806
Agent fees and commissions 13,655 12,825
General and administrative 1,693 1,493
Depreciation and amortization 541 533
Total costs and expenses 19,644 18,657
Operating income 4,603 3,501
Capital expenditures 155 927
Intersegment Elims [Member]
    
Segment Reporting Information [Line Items]    
Revenue (13,866) (11,131)
Transportation costs $ (13,866) $ (11,131)