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Summary of Revenue by Segment and Business Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 848,449	$ 768,980
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	522,666	505,265
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	162,045	155,372
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	163,738	108,343
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	653,409	592,651
Operating Segments [Member] | Hub [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	435,432	428,992
Operating Segments [Member] | Hub [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	83,967	81,902
Operating Segments [Member] | Hub [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	134,010	81,757
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	208,906	187,460
Operating Segments [Member] | Mode [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	100,436	86,736
Operating Segments [Member] | Mode [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	78,523	73,933
Operating Segments [Member] | Mode [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	29,947	26,791
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(13,866)	(11,131)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(13,202)	(10,463)
Intersegment Elims [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(445)	(463)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	$ (219)	$ (205)

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



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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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