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SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
SEGMENT INFORMATION [Abstract]
Number of operating segments			2
Summary of revenue [Abstract]
Revenue, Amount	$ 74,432	$ 70,616	$ 223,300	$ 213,220
Revenue, Percentage (in hundredths)	100.00%	100.00%	100.00%	100.00%
Truckload Services revenue [Member]
Summary of revenue [Abstract]
Revenue, Amount	68,518	66,349	204,665	199,802
Revenue, Percentage (in hundredths)	92.10%	94.00%	91.70%	93.70%
Brokerage and Logistics Services revenue [Member]
Summary of revenue [Abstract]
Revenue, Amount	$ 5,914	$ 4,267	$ 18,635	$ 13,418
Revenue, Percentage (in hundredths)	7.90%	6.00%	8.30%	6.30%

X

- Definition

The percentage of net service revenue to total net revenue from the sale of goods as of year end.

+ References

No definition available.

+ Details

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X

- Definition

Revenue from transporting cargo and freight between locations.

+ 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=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-AIR

-Paragraph 4

-IssueDate 2003-05-01

-Chapter 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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- Details

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