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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |
Asset impairment charges |  | $ 270,017,000 | $ 20,768,000 | $ 29,514,000
Executive transition costs |  |  | 6,300,000 | 1,600,000
Long-term compensation costs | $ 32,500,000 |  |  | 32,500,000
Pre-tax charge related to the extinguishment of debt |  | 0 | (6,690,000) | $ 0
Franchised dealerships |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |
Asset impairment charges |  | $ 270,000,000.0 | $ 1,101,000 |

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