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Business Acquisitions and Dispositions - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 Dealerships | Sep. 30, 2013 Dealerships | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |
Purchase price for franchise operations and underlying assets, including real estate, acquired | $ 88,200,000 | $ 88,184,000 |
Goodwill | 478,951,000 | 478,951,000 | 454,224,000
Number of dealerships held for sale | 0 | 0 |
2013 Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net assets relating to dealership operations | 43,500,000 | 43,500,000 |
Indefinite life intangible assets representing rights acquired under franchise agreements | 20,000,000 | 20,000,000 |
Goodwill | $ 24,700,000 | $ 24,700,000 |

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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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