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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, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |  |
Component of lease exit expense in interest expense, other, net |  |  | $ 0.1 |
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 |  |  | 1.4 |
Component of lease exit payments in selling, general and administrative expenses |  |  | 0.6 |
Component of lease exit payments in income (loss) from operations and the sale of dealerships |  |  | 3.8 |
Effective tax rate from continuing operations | 39.00% | 28.60% | 39.00% | 33.70%
Tax Benefit From State Tax Settlement | $ 3.6 |  | $ 3.6 |
Minimum [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Expected effective tax rate for continuing operations Range |  |  | 38.00% |
Maximum [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Expected effective tax rate for continuing operations Range |  |  | 40.00% |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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 2: 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 3: 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=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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