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Business Segments - Summary of Revenue by Segment and Business Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 882,981	$ 804,888	$ 2,488,646	$ 2,323,085
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	556,992	524,072	1,592,432	1,508,234
Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	169,440	166,811	489,129	486,703
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	156,549	114,005	407,085	328,148
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	678,573	619,336	1,916,149	1,778,436
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	217,424	199,903	608,802	581,378
Operating Segments [Member] | Intermodal [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	466,849	444,760	1,342,656	1,280,825
Operating Segments [Member] | Intermodal [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	102,105	92,552	284,056	260,823
Operating Segments [Member] | Truck brokerage [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	88,281	87,782	255,688	247,900
Operating Segments [Member] | Truck brokerage [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	81,708	79,746	234,551	241,062
Operating Segments [Member] | Logistics [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	123,443	86,794	317,805	249,711
Operating Segments [Member] | Logistics [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	33,611	27,605	90,195	79,493
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(13,016)	(14,351)	(36,305)	(36,729)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(11,962)	(13,240)	(34,280)	(33,414)
Intersegment Elims [Member] | Truck brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(549)	(717)	(1,110)	(2,259)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	$ (505)	$ (394)	$ (915)	$ (1,056)

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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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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