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Acquisitions (Narrative) (Details)		3 Months Ended	9 Months Ended
	May 01, 2017 USD ($) store $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Aug. 07, 2017 store	Sep. 12, 2016 store
Business Acquisition [Line Items]
Equity securities issued | $			$ 2,137,000	$ 0
Acquistion expense recognized | $		$ 3,500,000	$ 5,700,000	$ 0
Baierl Auto Group
Business Acquisition [Line Items]
Number of stores acquired | store	8
Equity interests issued or issuable (in shares) | shares	22,446
Share issuance period	4 years
Equity securities issued | $	$ 2,100,000
Price of acquisition (in dollars per share) | $ / shares	$ 95.22
Downtown LA Auto Group
Business Acquisition [Line Items]
Number of stores acquired | store					7
Carbone Auto Group
Business Acquisition [Line Items]
Number of stores acquired | store						9
Common Stock, Issued | Baierl Auto Group
Business Acquisition [Line Items]
Equity interests issued or issuable (in shares) | shares	4,489
Common Stock, Issuable | Baierl Auto Group
Business Acquisition [Line Items]
Equity interests issued or issuable (in shares) | shares	17,957

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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