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ACCOUNTING POLICIES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
ACCOUNTING POLICIES [Abstract] |  |  |
Bank overdrafts | $ 4,803,000 | $ 6,997,000 |
Accounts receivable from company drivers | 882,000 | 601,000 |
Property and Equipment [Line Items] |  |  |
Decrease in depreciation expense as a result of adjustments to estimated lives and salvage values | 450,000 |  |
Additional depreciation expense |  | 4,200,000 |
Increase (decrease) in net income (loss) as a result of adjustments to estimated lives and salvage values | 300,000 | (2,600,000) |
Increase (decrease) in net income (loss) per share as a result of adjustments to estimated lives and salvage values (in dollars per share) | $ 0.03 | $ (0.29) |
Prepaid Tires [Abstract] |  |  |
Period for the amortization of prepaid tires | 24 months |  |
Advertising Expense [Abstract] |  |  |
Advertising Expense | $ 685,000 | $ 437,000 | $ 239,000
Segment Reporting [Abstract] |  |  |
Truckload transportation services revenues, excluding fuel surcharges as a percentage of total revenues (in hundredths) | 91.80% | 93.50% | 85.90%
Service Vehicles [Member] | Minimum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 3 years |  |
Service Vehicles [Member] | Maximum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 5 years |  |
Office Furniture and Equipment [Member] | Minimum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 3 years |  |
Office Furniture and Equipment [Member] | Maximum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 7 years |  |
Revenue Equipment [Member] | Minimum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 3 years |  |
Revenue Equipment [Member] | Maximum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 12 years |  |
Structures and Improvements [Member] | Minimum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 5 years |  |
Structures and Improvements [Member] | Maximum [Member] |  |  |
Property and Equipment [Line Items] |  |  |
Useful Life | 40 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -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. + Details
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- Definition Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6743817&loc=d3e1243-112600 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 7 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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