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Financial Instruments And Fair Value Measurements (Policies)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Goodwill	Our principal identifiable intangible assets are individual store rights under franchise agreements with vehicle manufacturers, which have indefinite lives and are tested for impairment annually as of April 30 or more frequently when events or changes in circumstances indicate that impairment may have occurred. Under accounting standards, we chose to make a qualitative evaluation about the likelihood of franchise rights impairment to determine whether it was necessary to perform a quantitative impairment test.
Franchise Rights	Goodwill for our Domestic, Import, and Premium Luxury reporting units is tested for impairment annually as of 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, we chose to make a qualitative evaluation about the likelihood of goodwill impairment to determine whether it was necessary to calculate the fair values of our reporting units under the two-step goodwill impairment test.
Impairment Of Long-Lived Assets	Nonfinancial assets such as goodwill, other intangible assets, and long-lived assets held and used are measured at fair value when there is an indicator of impairment and recorded at fair value only when impairment is recognized or for a business combination. The fair values less costs to sell of long-lived assets held for sale are assessed each reporting period they remain classified as held for sale. Subsequent changes in the held for sale long-lived asset’s fair value less cost to sell (increase or decrease) is reported as an adjustment to its carrying amount, except that the adjusted carrying amount cannot exceed the carrying amount of the long-lived asset at the time it was initially classified as held for sale.