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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Nov. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
U.S. federal statutory rate |  |  |  |  | 35.00% |  |
Effect of federal tax law change | $ 5,200,000 | $ 2,000,000 |  |  | $ 2,030,000 |  | $ 5,229,000
Built-in-gains recognition period | 5 years |  | 10 years |  |  |  |
Recognized income tax benefit associated with release of valuation allowance |  | 53,400,000 |  |  | 53,400,000 |  |
Deferred tax benefit |  | 113,728,000 |  |  | 113,728,000 | $ 157,150,000 |
Charitable contribution carryforwards |  | 2,900,000 |  |  | 2,900,000 |  |
Increase decrease in federal and state valuation allowance |  |  |  |  | (74,000,000) |  |
State net operating loss carryforwards |  | 454,600,000 |  |  | 454,600,000 |  |
Unrecognized tax benefits |  | 0 |  |  | 0 | 0 |
Income tax penalties accrued related to uncertain tax positions |  | 0 |  |  | 0 | 0 |
Interest on income taxes accrued related to uncertain tax positions |  | 0 |  |  | 0 | 0 |
Charitable Contributions [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Deferred tax benefit |  | 600,000 |  |  | $ 600,000 |  |
Operating loss carryforwards expire date |  |  |  |  | 2018 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
U.S. federal statutory rate |  |  |  | 21.00% |  |  |
Federal [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Federal net operating loss carryforwards |  | 89,100,000 |  |  | $ 89,100,000 |  |
Deferred tax benefit |  | 18,700,000 |  |  | $ 18,700,000 |  |
Operating loss carryforwards expire date |  |  |  |  | 2033 |  |
Increase decrease in federal and state valuation allowance |  |  |  |  | $ (60,600,000) | 600,000 | (8,300,000)
State [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Deferred tax benefit |  | $ 26,100,000 |  |  | 26,100,000 |  |
Increase decrease in federal and state valuation allowance |  |  |  |  | $ (13,400,000) | $ (200,000) | $ (1,800,000)
State [Member] | Minimum [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards expire date |  |  |  |  | 2018 |  |
State [Member] | Maximum [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards expire date |  |  |  |  | 2037 |  |

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