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Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,054,661 |  |  |  | $ 1,414,614 |  |  |  | $ 1,054,661 | $ 1,414,614 | $ 1,305,250 | $ 1,098,073
Premiums Written, Net | 59,988 | $ 115,154 | $ 111,206 | $ 96,422 | 90,736 | $ 77,499 | $ 53,229 | $ 51,823 |  |  |  |
Allowance for Doubtful Accounts, Premiums and Other Receivables | 142 |  |  |  | 69 |  |  |  | 142 | 69 | 0 | $ 0
Premium Receivable, Credit Loss Expense (Reversal) |  |  |  |  |  |  |  |  | 73 | 69 | 0 |
Premium Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Premium Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 |
Past Due Premiums | $ 5,690 |  |  |  | $ 510 |  |  |  | $ 5,690 | $ 510 |  |

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