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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from operations | $ (200) | $ (301) | $ (2,701) | $ (6,146)
Gain (loss) on disposal | (823) | (88) | 45,570 | 39,149
Lease exit accrual adjustments and charges | 0 | (16) | 169 | (784)
Pre-tax income (loss) | (1,023) | (405) | 43,038 | 32,219
Total revenues | $ 2,455 | $ 100,242 | $ 54,682 | $ 386,160

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