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Summary of Operating Results and Certain Other Financial Data (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 1,179,093	$ 923,596	$ 2,275,064	$ 1,816,352
Transportation costs	1,042,903	822,279	2,016,083	1,613,450
Gross margin	136,190	101,317	258,981	202,902
Costs and expenses:
Salaries and benefits	58,092	45,038	114,099	88,217
Agent fees and commissions	21,969	17,038	41,111	35,031
General and administrative	20,216	20,114	40,720	40,938
Depreciation and amortization	3,960	2,549	7,965	4,961
Total costs and expenses	104,237	84,739	203,895	169,147
Operating income	31,953	16,578	55,086	33,755
Capital Expenditures	47,082	22,968	69,261	29,593
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	888,238	704,344	1,719,823	1,380,824
Transportation costs	788,087	631,787	1,529,297	1,236,462
Gross margin	100,151	72,557	190,526	144,362
Costs and expenses:
Salaries and benefits	53,839	41,569	105,909	81,164
Agent fees and commissions	11	14	25	31
General and administrative	17,768	18,331	36,170	36,810
Depreciation and amortization	3,719	2,249	7,478	4,357
Total costs and expenses	75,337	62,163	149,582	122,362
Operating income	24,814	10,395	40,944	22,000
Capital Expenditures	46,337	22,937	67,874	29,562
Operating Segments [Member] | Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	314,078	242,998	601,977	484,832
Transportation costs	278,039	214,238	533,522	426,292
Gross margin	36,039	28,760	68,455	58,540
Costs and expenses:
Salaries and benefits	4,253	3,469	8,190	7,053
Agent fees and commissions	21,958	17,024	41,086	35,000
General and administrative	2,448	1,783	4,550	4,128
Depreciation and amortization	241	300	487	604
Total costs and expenses	28,900	22,576	54,313	46,785
Operating income	7,139	6,184	14,142	11,755
Capital Expenditures	745	31	1,387	31
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(23,223)	(23,746)	(46,736)	(49,304)
Transportation costs	$ (23,223)	$ (23,746)	$ (46,736)	$ (49,304)

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