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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 17,700,000 | $ 1,900,000 | $ 15,600,000 |  | $ 10,300,000 | $ 3,600,000 | $ 20,768,000 | $ 29,514,000 | $ 9,394,000
Lease exit accrual adjustments and charges |  |  |  |  | 2,600,000 | 4,800,000 |  |  |
Executive transition costs |  |  |  | $ 1,600,000 |  |  | 6,300,000 | 1,600,000 | 1,300,000
Storm-related physical damage |  |  |  | 1,200,000 | 3,100,000 |  |  |  |
Long-term compensation costs |  | $ 6,300,000 |  |  | 23,300,000 | 9,200,000 |  | 32,500,000 |
Tax benefit related to deferred income tax impact of change in U.S. federal tax income rate |  |  |  |  |  |  |  | 28,400,000 |
Pre-tax charge related to the extinguishment of debt | 7,200,000 |  |  |  |  |  | $ (6,690,000) | $ 0 | $ (14,607,000)
Net benefit from legal settlements |  |  |  |  |  | 1,500,000 |  |  |
7.0% Senior Subordinated Notes Expired |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate on debt agreement |  | 5.00% |  |  |  |  |  |  |
Franchised dealerships |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |
Lease exit accrual adjustments and charges |  |  | $ 800,000 |  |  |  |  |  |
Pre-tax gain (loss) on disposal | 29,300,000 | $ 46,700,000 |  | 300,000 | 38,000,000.0 | 1,200,000 |  |  |
Gain (loss) on disposal of dealerships (1) | $ 29,300,000 | $ 46,700,000 |  | $ 300,000 | $ 38,000,000.0 | $ 1,200,000 |  |  |

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