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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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