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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 15,600 |  | $ 10,300 | $ 3,600 | $ 6,100 | $ 200 | $ 2,600 | $ 500 | $ 29,514 | $ 9,394 | $ 8,063
Lease exit accrual adjustments and charges |  |  | 2,600 | 4,800 |  |  | 1,000 |  |  |  |
Executive transition costs |  | $ 1,600 |  |  |  |  |  |  |  |  |
Storm-related physical damage |  | 1,200 |  |  | 1,400 | 3,000 | 4,600 | 2,400 |  |  |
Long-term compensation costs |  |  | 23,300 | 9,200 |  |  |  |  |  |  |
Storm-related physical damage and legal costs |  |  | 3,100 |  |  |  |  |  |  |  |
Legal costs |  |  |  | $ 1,500 |  |  |  |  |  |  |
Tax benefit related to deferred income tax impact of change in U.S. federal tax income rate |  |  |  |  | (28,400) |  |  |  |  | 28,400 |
Legal and other |  |  |  |  | 1,500 | 1,000 | $ 1,000 |  |  |  |
Pre-tax charge related to the extinguishment of debt |  |  |  |  |  |  |  | 15,300 | $ 0 | $ (14,607) | $ 0
Net benefit from legal settlements |  |  |  |  |  |  |  | $ 1,100 |  |  |
7.0% Senior Subordinated Notes Expired |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt agreement |  |  |  | 7.00% |  |  |  |  |  |  |
Franchised dealerships |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease exit accrual adjustments and charges | $ 800 |  |  |  |  |  |  |  |  |  |
Costs to sell |  | $ 300 |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on disposal |  |  | 38,000 | $ 1,200 | 1,500 | 8,500 |  |  |  |  |
Gain (loss) on disposal |  |  | $ 38,000 | $ 1,200 | $ 1,500 | $ 8,500 |  |  |  |  |

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