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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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 836,685	$ 778,312	$ 1,605,665	$ 1,518,197
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	531,833	507,011	1,035,440	984,161
Truck Brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	162,659	160,892	319,689	319,891
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	142,193	110,409	250,536	214,145
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue	644,924	595,888	1,237,575	1,159,100
Operating Segments [Member] | Hub [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	448,472	431,894	875,806	836,064
Operating Segments [Member] | Hub [Member] | Truck Brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	83,847	80,094	167,407	160,118
Operating Segments [Member] | Hub [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	112,605	83,900	194,362	162,918
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue	203,918	194,292	391,378	381,475
Operating Segments [Member] | Mode [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	95,215	86,048	181,951	168,270
Operating Segments [Member] | Mode [Member] | Truck Brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	78,910	81,379	152,843	161,316
Operating Segments [Member] | Mode [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	29,793	26,865	56,584	51,889
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Revenue	(12,157)	(11,868)	(23,288)	(22,378)
Intersegment Elims [Member] | Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue	(11,854)	(10,931)	(22,317)	(20,173)
Intersegment Elims [Member] | Truck Brokerage [Member]
Segment Reporting Information [Line Items]
Revenue	(98)	(581)	(561)	(1,543)
Intersegment Elims [Member] | Logistics [Member]
Segment Reporting Information [Line Items]
Revenue	$ (205)	$ (356)	$ (410)	$ (662)

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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
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X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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