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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships That Remain in Continuing Operations (Details) - Disposed dealerships that remain in continuing operations - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Income (loss) from operations | $ (160) | $ (2,553)
Gain (loss) on disposal | 2 | 46,750
Lease exit accrual adjustments and charges | 0 | 170
Pre-tax income (loss) | (158) | 44,367
Total revenues | $ 0 | $ 106,774

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