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Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Component of lease exit expense in interest expense, other, net |  |  | $ 0.2 |
Component of lease exit expense in selling, general and administrative expenses |  |  | 0.1 |
Component of lease exit expense in income (loss) from operations and the sale of dealerships |  |  | 1.2 |
Component of lease exit payments in selling, general and administrative expenses |  |  | 0.8 |
Component of lease exit payments in income (loss) from operations and the sale of dealerships |  |  | 3.5 |
Effective tax rate from continuing operations | 27.90% | 37.30% | 33.20% | 38.40%
Effective tax benefit from continuing operations, amount | $ 3.6 |  | $ 3.6 |

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- Definition Lease exit expense discontinued operations. + References No definition available. + Details
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- Definition Lease exit expense interest other. + References No definition available. + Details
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- Definition Lease exit expense selling general and administrative. + References No definition available. + Details
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- Definition A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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