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Acquisitions (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 01, 2018 store	Feb. 26, 2018 store	Aug. 07, 2017 store	May 01, 2017 store
Business Acquisition [Line Items]
Acquisition expense recognized | $	$ 0.9
Day Auto Group
Business Acquisition [Line Items]
Number of stores acquired			7
Prestige Auto Group
Business Acquisition [Line Items]
Number of stores acquired		6
Baierl Auto Group
Business Acquisition [Line Items]
Number of stores acquired					8
Downtown LA Auto Group
Business Acquisition [Line Items]
Number of stores acquired				7

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- Definition

Number of Stores Acquired

+ References

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- Definition

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+ References

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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