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Summary of Revenue by Segment and Business Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 893,930	$ 836,685	$ 1,742,379	$ 1,605,665
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	550,470	534,435	1,073,136	1,039,699
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	172,853	160,005	334,898	315,377
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	170,607	142,245	334,345	250,589
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	682,049	644,924	1,335,458	1,237,575
Operating Segments [Member] | Hub [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	455,763	451,074	891,195	880,065
Operating Segments [Member] | Hub [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	86,407	81,193	170,374	163,095
Operating Segments [Member] | Hub [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	139,879	112,657	273,889	194,415
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	231,538	203,918	440,444	391,378
Operating Segments [Member] | Mode [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	113,744	95,215	214,180	181,951
Operating Segments [Member] | Mode [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	86,537	78,910	165,060	152,843
Operating Segments [Member] | Mode [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	31,257	29,793	61,204	56,584
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(19,657)	(12,157)	(33,523)	(23,288)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(19,037)	(11,854)	(32,239)	(22,317)
Intersegment Elims [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(91)	(98)	(536)	(561)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	$ (529)	$ (205)	$ (748)	$ (410)

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- 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration