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Summary of Operating Results (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Revenue $ 932,814 $ 899,869 $ 2,594,230 $ 2,635,323
Transportation costs 821,360 794,805 2,259,899 2,339,402
Gross margin 111,454 105,064 334,331 295,921
Costs and expenses:        
Salaries and benefits 42,610 36,357 130,075 114,670
Agent fees and commissions 19,072 17,862 54,334 49,374
General and administrative 17,641 15,461 50,368 44,295
Depreciation and amortization 2,276 1,966 6,559 5,893
Total costs and expenses 81,599 71,646 241,336 214,232
Operating income 29,855 33,418 92,995 81,689
Capital Expenditures 34,666 17,235 59,883 40,951
Operating Segments [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 716,699 680,559 1,980,450 2,010,453
Transportation costs 638,154 606,081 1,739,676 1,800,628
Gross margin 78,545 74,478 240,774 209,825
Costs and expenses:        
Salaries and benefits 38,775 32,917 118,658 103,865
Agent fees and commissions 20 14 47 43
General and administrative 15,969 13,659 44,917 39,051
Depreciation and amortization 1,959 1,647 5,603 4,912
Total costs and expenses 56,723 48,237 169,225 147,871
Operating income 21,822 26,241 71,549 61,954
Capital Expenditures 34,411 15,817 59,356 39,365
Operating Segments [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 251,611 239,375 692,366 686,744
Transportation costs 218,702 208,789 598,809 600,648
Gross margin 32,909 30,586 93,557 86,096
Costs and expenses:        
Salaries and benefits 3,835 3,440 11,417 10,805
Agent fees and commissions 19,052 17,848 54,287 49,331
General and administrative 1,672 1,802 5,451 5,244
Depreciation and amortization 317 319 956 981
Total costs and expenses 24,876 23,409 72,111 66,361
Operating income 8,033 7,177 21,446 19,735
Capital Expenditures 255 1,418 527 1,586
Intersegment Elims [Member]        
Segment Reporting Information [Line Items]        
Revenue (35,496) (20,065) (78,586) (61,874)
Transportation costs $ (35,496) $ (20,065) $ (78,586) $ (61,874)