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Summary of Operating Results (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 1,054,360 $ 932,814 $ 2,872,321 $ 2,594,230
Transportation costs 937,836 821,360 2,552,895 2,259,899
Gross margin 116,524 111,454 319,426 334,331
Costs and expenses:        
Salaries and benefits 49,126 42,610 137,343 130,075
Agent fees and commissions 19,072 19,072 54,103 54,334
General and administrative 22,403 17,641 63,341 50,368
Depreciation and amortization 4,254 2,276 9,215 6,559
Total costs and expenses 94,855 81,599 264,002 241,336
Operating income 21,669 29,855 55,424 92,995
Capital Expenditures 10,343 34,666 39,936 59,883
Operating Segments [Member] | Hub [Member]        
Segment Reporting Information [Line Items]        
Revenue 820,802 716,699 2,203,142 1,980,450
Transportation costs 734,747 638,154 1,972,725 1,739,676
Gross margin 86,055 78,545 230,417 240,774
Costs and expenses:        
Salaries and benefits 45,727 38,775 126,891 118,658
Agent fees and commissions 15 20 46 47
General and administrative 20,520 15,969 57,330 44,917
Depreciation and amortization 3,962 1,959 8,319 5,603
Total costs and expenses 70,224 56,723 192,586 169,225
Operating income 15,831 21,822 37,831 71,549
Capital Expenditures 10,170 34,411 39,732 59,356
Operating Segments [Member] | Mode LLC [Member]        
Segment Reporting Information [Line Items]        
Revenue 258,696 251,611 743,621 692,366
Transportation costs 228,227 218,702 654,612 598,809
Gross margin 30,469 32,909 89,009 93,557
Costs and expenses:        
Salaries and benefits 3,399 3,835 10,452 11,417
Agent fees and commissions 19,057 19,052 54,057 54,287
General and administrative 1,883 1,672 6,011 5,451
Depreciation and amortization 292 317 896 956
Total costs and expenses 24,631 24,876 71,416 72,111
Operating income 5,838 8,033 17,593 21,446
Capital Expenditures 173 255 204 527
Intersegment Elims [Member]        
Segment Reporting Information [Line Items]        
Revenue (25,138) (35,496) (74,442) (78,586)
Transportation costs $ (25,138) $ (35,496) $ (74,442) $ (78,586)