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Interim Financial Statements (Business and Basis of Presentation) (Details)	6 Months Ended
	Jun. 30, 2017 brand stores franchises
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Owned and operated new vehicle franchises \| franchises	364
Number of stores \| stores	258
Number of brands \| brand	33
Percentage of new vehicle sales from core brands (percent)	93.00%
Owned and operated collision centers	72