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Summary of Operating Results (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 899,513	$ 893,930	$ 1,735,454	$ 1,742,379
Transportation costs	797,784	795,345	1,544,597	1,555,050
Gross margin	101,729	98,585	190,857	187,329
Costs and expenses:
Salaries and benefits	38,837	35,556	78,313	72,648
Agent fees and commissions	16,686	15,544	31,512	29,210
General and administrative	14,763	14,681	28,834	30,113
Depreciation and amortization	1,967	1,877	3,927	3,935
Total costs and expenses	72,253	67,658	142,586	135,906
Operating income	29,476	30,927	48,271	51,423
Capital Expenditures	8,659	13,408	23,716	46,443
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	686,451	682,049	1,329,894	1,335,458
Transportation costs	614,289	611,351	1,194,547	1,200,262
Gross margin	72,162	70,698	135,347	135,196
Costs and expenses:
Salaries and benefits	35,288	32,047	70,948	65,384
Agent fees and commissions	14	5	29	16
General and administrative	13,194	12,817	25,392	26,557
Depreciation and amortization	1,647	1,538	3,265	3,055
Total costs and expenses	50,143	46,407	99,634	95,012
Operating income	22,019	24,291	35,713	40,184
Capital Expenditures	8,550	13,223	23,548	46,103
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	233,847	231,538	447,369	440,444
Transportation costs	204,280	203,651	391,859	388,311
Gross margin	29,567	27,887	55,510	52,133
Costs and expenses:
Salaries and benefits	3,549	3,509	7,365	7,264
Agent fees and commissions	16,672	15,539	31,483	29,194
General and administrative	1,569	1,864	3,442	3,556
Depreciation and amortization	320	339	662	880
Total costs and expenses	22,110	21,251	42,952	40,894
Operating income	7,457	6,636	12,558	11,239
Capital Expenditures	109	185	168	340
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(20,785)	(19,657)	(41,809)	(33,523)
Transportation costs	$ (20,785)	$ (19,657)	$ (41,809)	$ (33,523)

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