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Summary of Revenue by Segment and Business Line (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
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	561,747	560,339	1,634,883	1,600,038
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	171,447	165,576	506,345	480,953
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	180,192	157,066	514,537	407,655
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	691,835	678,573	2,027,293	1,916,149
Operating Segments [Member] | Hub [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	460,935	470,196	1,352,130	1,350,262
Operating Segments [Member] | Hub [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	84,208	84,417	254,582	247,512
Operating Segments [Member] | Hub [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	146,692	123,960	420,581	318,375
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	245,421	217,424	685,865	608,802
Operating Segments [Member] | Mode [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	123,438	102,105	337,618	284,056
Operating Segments [Member] | Mode [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	87,420	81,708	252,480	234,551
Operating Segments [Member] | Mode [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	34,563	33,611	95,767	90,195
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(23,870)	(13,016)	(57,393)	(36,305)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(22,626)	(11,962)	(54,865)	(34,280)
Intersegment Elims [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(181)	(549)	(717)	(1,110)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	$ (1,063)	$ (505)	$ (1,811)	$ (915)

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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
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