Summary of Operating Results (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 913,386	$ 882,981	$ 2,655,765	$ 2,488,646
Transportation costs	820,190	789,857	2,375,240	2,212,711
Gross margin	93,196	93,124	280,525	275,935
Costs and expenses:
Salaries and benefits	30,868	31,888	103,516	101,473
Agent fees and commissions	16,592	14,557	45,802	41,517
General and administrative	13,868	13,757	43,981	41,676
Depreciation and amortization	1,967	1,627	5,902	4,773
Driver settlements and related costs	10,343		10,343
Impairment of software	11,881		11,881
Total costs and expenses	85,519	61,829	221,425	189,439
Operating income	7,677	31,295	59,100	86,496
Capital expenditures	29,438	26,877	75,881	66,079
Operating Segments [Member] \| Hub [Member]
Segment Reporting Information [Line Items]
Revenue	691,835	678,573	2,027,293	1,916,149
Transportation costs	627,752	611,344	1,828,014	1,712,314
Gross margin	64,083	67,229	199,279	203,835
Costs and expenses:
Salaries and benefits	27,428	28,274	92,812	90,259
Agent fees and commissions	15	425	31	1,223
General and administrative	12,144	12,065	38,701	37,101
Depreciation and amortization	1,627	1,088	4,682	3,169
Driver settlements and related costs	10,343		10,343
Impairment of software	11,881		11,881
Total costs and expenses	63,438	41,852	158,450	131,752
Operating income	645	25,377	40,829	72,083
Capital expenditures	29,287	26,834	75,390	64,989
Operating Segments [Member] \| Mode [Member]
Segment Reporting Information [Line Items]
Revenue	245,421	217,424	685,865	608,802
Transportation costs	216,308	191,529	604,619	536,702
Gross margin	29,113	25,895	81,246	72,100
Costs and expenses:
Salaries and benefits	3,440	3,614	10,704	11,214
Agent fees and commissions	16,577	14,132	45,771	40,294
General and administrative	1,724	1,692	5,280	4,575
Depreciation and amortization	340	539	1,220	1,604
Total costs and expenses	22,081	19,977	62,975	57,687
Operating income	7,032	5,918	18,271	14,413
Capital expenditures	151	43	491	1,090
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(23,870)	(13,016)	(57,393)	(36,305)
Transportation costs	$ (23,870)	$ (13,016)	$ (57,393)	$ (36,305)

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