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Summary of Revenue by Segment and Business Line (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
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	563,067	550,470	1,074,301	1,073,136
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	175,341	172,853	338,820	334,898
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	161,105	170,607	322,333	334,345
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	686,451	682,049	1,329,894	1,335,458
Operating Segments [Member] | Hub [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	464,904	455,763	885,855	891,195
Operating Segments [Member] | Hub [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	93,067	86,407	182,359	170,374
Operating Segments [Member] | Hub [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	128,480	139,879	261,680	273,889
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	233,847	231,538	447,369	440,444
Operating Segments [Member] | Mode [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	118,121	113,744	228,813	214,180
Operating Segments [Member] | Mode [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	82,691	86,537	157,043	165,060
Operating Segments [Member] | Mode [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	33,035	31,257	61,513	61,204
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(20,785)	(19,657)	(41,809)	(33,523)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(19,958)	(19,037)	(40,367)	(32,239)
Intersegment Elims [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(417)	(91)	(582)	(536)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	$ (410)	$ (529)	$ (860)	$ (748)

X

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1(d))



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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