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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax benefit related to deferred income tax impact of change in U.S. federal tax income rate | $ (28,400) |  |  |  |  |  |  |  | $ (28,400) |  |
U.S. statutory federal income tax rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Pre-tax benefit related to storm damage and other accrual adjustments | 1,400 |  |  |  | $ 400 | $ 2,300 |  |  |  |  |
Pre-tax gain (loss) on disposal |  |  |  |  |  |  |  |  | $ 11,188 | $ (47) | $ 2,748
Asset impairment charges | 6,100 | $ 200 | $ 2,600 | $ 500 | 1,800 | 6,100 | $ 6,000 |  | 9,394 | $ 8,063 | $ 17,955
Pre-tax legal and other charges | 1,500 |  |  |  |  |  |  |  |  |  |
Pre-tax charges against to natural damages |  | 3,000 | 4,600 | 2,400 |  |  |  |  |  |  |
Pre-tax charges related to legal and other accrual adjustments |  | 1,000 |  |  |  |  |  |  |  |  |
Pre-tax legal accruals and settlements |  |  | 1,000 |  |  |  |  |  |  |  |
Lease exit expense |  |  | $ 1,000 |  |  |  |  |  | 2,200 |  |
Pre-tax charge related to the extinguishment of debt |  |  |  |  |  |  |  |  | $ (14,607) |  |
Net benefit from legal settlements |  |  |  | 1,100 |  |  |  |  |  |  |
Pre-tax benefit related to manufacturer legal settlement |  |  |  |  | 14,800 |  |  |  |  |  |
Pre-tax benefit (charges) related to lease exit accrual adjustments in discontinued operations |  |  |  |  | $ (500) | $ (1,000) | $ 500 |  |  |  |
7.0% Senior Subordinated Notes Expired [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge related to the extinguishment of debt |  |  |  | $ (15,300) |  |  |  |  |  |  |
Stated interest rate on debt agreement |  |  |  | 7.00% |  |  |  |  |  |  |
Franchised Dealerships Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on disposal | $ 1,500 | $ 8,500 |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
U.S. statutory federal income tax rate |  |  |  |  |  |  |  | 21.00% |  |  |

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