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Summary of Operating Results (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 924,513	$ 855,557	$ 1,817,961	$ 1,661,416
Transportation costs	823,196	741,067	1,615,059	1,438,539
Gross margin	101,317	114,490	202,902	222,877
Costs and expenses:
Salaries and benefits	45,038	43,602	88,217	87,465
Agent fees and commissions	17,038	18,360	35,031	35,262
General and administrative	20,114	16,083	40,938	32,727
Depreciation and amortization	2,549	2,148	4,961	4,283
Total costs and expenses	84,739	80,193	169,147	159,737
Operating income	16,578	34,297	33,755	63,140
Capital Expenditures	22,968	20,324	29,593	25,217
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	705,208	648,523	1,382,340	1,263,751
Transportation costs	632,651	565,448	1,237,978	1,101,522
Gross margin	72,557	83,075	144,362	162,229
Costs and expenses:
Salaries and benefits	41,569	39,787	81,164	79,883
Agent fees and commissions	14	13	31	27
General and administrative	18,331	14,226	36,810	28,948
Depreciation and amortization	2,249	1,830	4,357	3,644
Total costs and expenses	62,163	55,856	122,362	112,502
Operating income	10,394	27,219	22,000	49,727
Capital Expenditures	22,937	20,314	29,562	24,945
Operating Segments [Member] | Mode LLC [Member]
Segment Reporting Information [Line Items]
Revenue	243,051	231,924	484,925	440,755
Transportation costs	214,291	200,509	426,385	380,107
Gross margin	28,760	31,415	58,540	60,648
Costs and expenses:
Salaries and benefits	3,469	3,815	7,053	7,582
Agent fees and commissions	17,024	18,347	35,000	35,235
General and administrative	1,783	1,857	4,128	3,779
Depreciation and amortization	300	318	604	639
Total costs and expenses	22,576	24,337	46,785	47,235
Operating income	6,184	7,078	11,755	13,413
Capital Expenditures	31	10	31	272
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(23,746)	(24,890)	(49,304)	(43,090)
Transportation costs	$ (23,746)	$ (24,890)	$ (49,304)	$ (43,090)

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