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Summary of Operating Results (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 899,869	$ 913,386	$ 2,635,323	$ 2,655,765
Transportation costs	794,805	820,190	2,339,402	2,375,240
Gross margin	105,064	93,196	295,921	280,525
Costs and expenses:
Salaries and benefits	36,357	30,868	114,670	103,516
Agent fees and commissions	17,862	16,592	49,374	45,802
General and administrative	15,461	13,868	44,295	43,981
Depreciation and amortization	1,966	1,967	5,893	5,902
Driver settlements and related costs		10,343		10,343
Impairment of software		11,881		11,881
Total costs and expenses	71,646	85,519	214,232	221,425
Operating income	33,418	7,677	81,689	59,100
Capital Expenditures	17,235	29,438	40,951	75,881
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	680,559	691,835	2,010,453	2,027,293
Transportation costs	606,081	627,752	1,800,628	1,828,014
Gross margin	74,478	64,083	209,825	199,279
Costs and expenses:
Salaries and benefits	32,917	27,428	103,865	92,812
Agent fees and commissions	14	15	43	31
General and administrative	13,659	12,144	39,051	38,701
Depreciation and amortization	1,647	1,627	4,912	4,682
Driver settlements and related costs		10,343		10,343
Impairment of software		11,881		11,881
Total costs and expenses	48,237	63,438	147,871	158,450
Operating income	26,241	645	61,954	40,829
Capital Expenditures	15,817	29,287	39,365	75,390
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	239,375	245,421	686,744	685,865
Transportation costs	208,789	216,308	600,648	604,619
Gross margin	30,586	29,113	86,096	81,246
Costs and expenses:
Salaries and benefits	3,440	3,440	10,805	10,704
Agent fees and commissions	17,848	16,577	49,331	45,771
General and administrative	1,802	1,724	5,244	5,280
Depreciation and amortization	319	340	981	1,220
Total costs and expenses	23,409	22,081	66,361	62,975
Operating income	7,177	7,032	19,735	18,271
Capital Expenditures	1,418	151	1,586	491
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(20,065)	(23,870)	(61,874)	(57,393)
Transportation costs	$ (20,065)	$ (23,870)	$ (61,874)	$ (57,393)

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