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Business Acquisitions and Dispositions (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Acquisition Dealership | Dec. 31, 2011 Dealership | Dec. 31, 2010 Dealership
Business Acquisitions and Dispositions (Textual) [Abstract] |  |  |
Aggregate cost of acquisitions during fiscal year |  | $ 50.0 |
Aggregate cost of acquisitions during term of agreement |  | 175.0 |
Disposed dealerships | 10 | 0 | 7
Cash generated from disposition | 72.2 |  | 24.7
Interest allocated to discontinued operations | $ 0.7 | $ 1.2 | $ 2.1
Number of Acquisition During Year | 0 |  |

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- Definition Aggregate cost of acquisitions during fiscal year for restricting dealership acquisitions. + References No definition available. + Details
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- Definition Aggregate cost of acquisitions during terms of agreement for restricting dealership. + References No definition available. + Details
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- Details
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- Definition Number of acquisitions. + References No definition available. + Details
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- Definition Number of dealerships disposed. + References No definition available. + Details
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- Definition Amount of interest expense allocated to disposal group, including a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1060-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6361211&loc=d3e7436-122677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 205 -SubTopic 20 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1063-107759 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -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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