Goodwill and Intangible Assets, Net (Policies)	12 Months Ended
Goodwill and Intangible Assets, Net (Policies)	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy	Our principal identifiable intangible assets are individual store rights under franchise agreements with vehicle manufacturers, which have indefinite lives and are tested at least annually on April 30 for impairment. As discussed in Note 1 above, the FASB issued an accounting standard update that permits an entity to first make a qualitative evaluation about the likelihood that an indefinite-lived intangible asset is impaired to determine whether it is necessary to perform a quantitative impairment test. We completed our qualitative assessment of any potential franchise rights impairment as of April 30, 2013.
Goodwill and Intangible Assets, Goodwill, Policy	We test goodwill of our Domestic, Import, and Premium Luxury reporting units for impairment annually on April 30 or more frequently when events or changes in circumstances indicate that the carrying value of a reporting unit more likely than not exceeds its fair value. Under accounting standards, an entity is permitted to first make a qualitative evaluation about the likelihood of goodwill impairment to determine whether it is necessary to calculate the fair value of a reporting unit under the quantitative two-step goodwill impairment test. We completed qualitative annual assessments of any potential goodwill impairment as of April 30, 2013 and 2012.

Disclosure of accounting policy for indefinite-lived intangible assets (that is, those intangible assets not subject to amortization). This accounting policy also may address how the entity assesses whether events and circumstances continue to support an indefinite useful life and how the entity assesses and measures impairment of such assets.

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