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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 120,738 | $ 7,670
Deferred tax assets: |  |
Net operating loss and capital carryforward | 349,931 | 341,886
Deferred Tax Asset, Interest Carryforward | 9,138 | 3,590
Deferred Tax Assets, Investments | 0 | 1,072
Loss reserves | 1,102 | 162
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 3,096 | 7,650
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 1,423 | 1,423
Other | 429 | 1,625
Sub total deferred tax assets | 365,119 | 357,408
Valuation allowance | 244,381 | 349,738
Insurance intangible | 71,414 |
Deferred Tax Liabilities Outside Basis Difference Discontinued Operations | 105,630 |
Unearned premiums and credit fees | 9,474 | 7,531
Investments | 3,568 | 0
Other | 787 | 139
Deferred Tax Liabilities, Gross | 190,873 | 7,670
Deferred Tax Liabilities, Net | 70,135 | 0
Deferred Income Tax Liabilities, Net | 70,135 | 0
Discontinued Operations |  |
Deferred tax assets: |  |
Deferred Income Tax Liabilities, Net | 20,382 | 19,138
Discontinued Operations, Held-for-Sale or Disposed of by Sale | Ambac Assurance Corporation |  |
Deferred tax assets: |  |
Other liabilities, net | $ 105,772 | $ 131,294

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