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Summary of Operating Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Revenue $ 893,448 $ 805,859
Transportation costs 791,863 697,472
Gross margin 101,585 108,387
Costs and expenses:    
Salaries and benefits 43,179 43,863
Agent fees and commissions 17,993 16,901
General and administrative 20,824 16,644
Depreciation and amortization 2,412 2,136
Total costs and expenses 84,408 79,544
Operating income 17,177 28,843
Capital Expenditures 6,625 4,893
Operating Segments [Member] | Hub [Member]    
Segment Reporting Information [Line Items]    
Revenue 677,132 615,227
Transportation costs 605,326 536,073
Gross margin 71,806 79,154
Costs and expenses:    
Salaries and benefits 39,596 40,096
Agent fees and commissions 17 13
General and administrative 18,479 14,722
Depreciation and amortization 2,109 1,815
Total costs and expenses 60,201 56,646
Operating income 11,605 22,508
Capital Expenditures 6,625 4,631
Operating Segments [Member] | Mode LLC [Member]    
Segment Reporting Information [Line Items]    
Revenue 241,874 208,832
Transportation costs 212,095 179,599
Gross margin 29,779 29,233
Costs and expenses:    
Salaries and benefits 3,583 3,767
Agent fees and commissions 17,976 16,888
General and administrative 2,345 1,922
Depreciation and amortization 303 321
Total costs and expenses 24,207 22,898
Operating income 5,572 6,335
Capital Expenditures   262
Intersegment Elims [Member]    
Segment Reporting Information [Line Items]    
Revenue (25,558) (18,200)
Transportation costs $ (25,558) $ (18,200)