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Segment Information (Disclosure Of Segment Financial Information) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Revenues	$ 509,587	$ 463,262	$ 1,494,913	$ 1,351,806
Operating Income	50,066	40,145	124,275	93,955
Truckload Transportation Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues	428,565	395,417	1,270,855	1,150,523
Operating Income	45,715	37,275	114,745	83,910
Value Added Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues	76,635	64,683	211,435	191,149
Operating Income	4,074	2,813	11,203	8,243
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenues	3,274	2,262	9,185	7,309
Operating Income	545	(693)	(1,077)	(522)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,113	900	3,438	2,825
Operating Income	$ (268)	$ 750	$ (596)	$ 2,324

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ Details

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X

- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ 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)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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