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Summary of Operating Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Revenue $ 805,859 $ 835,941
Transportation costs 697,472 746,813
Gross margin 108,387 89,128
Costs and expenses:    
Salaries and benefits 43,863 39,476
Agent fees and commissions 16,901 14,826
General and administrative 16,644 14,071
Depreciation and amortization 2,136 1,960
Total costs and expenses 79,544 70,333
Operating income 28,843 18,795
Capital Expenditures 4,893 15,057
Operating Segments [Member] | Hub [Member]    
Segment Reporting Information [Line Items]    
Revenue 615,227 643,443
Transportation costs 536,073 580,258
Gross margin 79,154 63,185
Costs and expenses:    
Salaries and benefits 40,096 35,660
Agent fees and commissions 13 15
General and administrative 14,722 12,198
Depreciation and amortization 1,815 1,618
Total costs and expenses 56,646 49,491
Operating income 22,508 13,694
Capital Expenditures 4,631 14,998
Operating Segments [Member] | Mode LLC [Member]    
Segment Reporting Information [Line Items]    
Revenue 208,832 213,522
Transportation costs 179,599 187,579
Gross margin 29,233 25,943
Costs and expenses:    
Salaries and benefits 3,767 3,816
Agent fees and commissions 16,888 14,811
General and administrative 1,922 1,873
Depreciation and amortization 321 342
Total costs and expenses 22,898 20,842
Operating income 6,335 5,101
Capital Expenditures 262 59
Intersegment Elims [Member]    
Segment Reporting Information [Line Items]    
Revenue (18,200) (21,024)
Transportation costs $ (18,200) $ (21,024)