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Business Segments (Schedule Of Revenue By Segment And Business Line) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Revenue by segment and business line	$ 739,885	$ 485,379
Hub [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	563,212	485,379
Mode [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	187,183
Inter-Segment Elims [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	(10,510)
Intermodal [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	477,152	336,681
Intermodal [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	404,171	336,681
Intermodal [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	82,223
Intermodal [Member] | Inter-Segment Elims [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	(9,242)
Truck Brokerage [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	158,999	84,686
Truck Brokerage [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	80,024	84,686
Truck Brokerage [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	79,937
Truck Brokerage [Member] | Inter-Segment Elims [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	(962)
Logistics [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	103,734	64,012
Logistics [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	79,017	64,012
Logistics [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	25,023
Logistics [Member] | Inter-Segment Elims [Member]
Segment Reporting Information [Line Items]
Revenue by segment and business line	$ (306)

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 SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: 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=6880815&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueServicesNet
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