Interim Financial Statements (Details)	9 Months Ended
	Sep. 30, 2015 brand stores franchises
Segment Reporting Information [Line Items]
Percentage of new vehicle sales from core brands	95.00%
Number of brands | brand	35
Number of stores | stores	240
Owned and operated new vehicle franchises	307
Ram [Member]
Segment Reporting Information [Line Items]
Owned and operated new vehicle franchises	10