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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Written |  |  |  |  |  |  |  |  | $ (334,311) | $ (233,702) | $ (146,379)
Assumed Reinsurance Premiums Written |  |  |  |  |  |  |  |  | 48,459 | 39,585 | 0
Ceded Reinsurance Premiums Written |  |  |  |  |  |  |  |  | (294,088) | (193,462) | (117,826)
Premiums written, net of reinsurance | $ 2,608 | $ (32,754) | $ (32,289) | $ (26,247) | $ (36,750) | $ (24,768) | $ (9,120) | $ (9,187) | (88,682) | (79,825) | (28,553)
Direct Premiums Earned |  |  |  |  |  |  |  |  | 298,121 | 185,470 | 70,577
Net premiums earned | 18,931 | $ 27,441 | $ 27,054 | $ 25,579 | 24,945 | $ 12,187 | $ 7,785 | $ 6,995 | 99,005 | 51,911 | 13,869
Assumed Reinsurance Premiums Earned |  |  |  |  |  |  |  |  | 57,081 | 18,354 | 0
Ceded Reinsurance Premiums Earned |  |  |  |  |  |  |  |  | 256,197 | 151,913 | $ 56,708
Reinsurance Recoverable, Allowance for Credit Loss | $ 100 |  |  |  | $ 100 |  |  |  | $ 100 | $ 100 |

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