Acquisitions (Details)	1 Months Ended	6 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Stores [Member]
Business Acquisition [Line Items]
Number of stores purchased			12
South Florida | Stores [Member]
Business Acquisition [Line Items]
Number of stores purchased		1
South Florida | Collision Centers [Member]
Business Acquisition [Line Items]
Number of stores purchased		1
Seattle | Collision Centers [Member]
Business Acquisition [Line Items]
Number of stores purchased		1
Subsequent Event [Member] | Dallas Fort-Worth | Collision Centers [Member]
Business Acquisition [Line Items]
Number of stores purchased	1