Acquisitions (Details) - store	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Nevada | Parts Distribution Center [Member]
Business Acquisition [Line Items]
Number of stores purchased	1
Utah | Parts Distribution Center [Member]
Business Acquisition [Line Items]
Number of stores purchased	1
Maryland | Collision Centers [Member]
Business Acquisition [Line Items]
Number of stores purchased		1