Fair Value Measurements - Schedule of financial instruments not carried at fair value as of the date presented (Detail) - USD ($) $ in Thousands |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Carrying Value [Member] | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Surplus note | $ 926 | $ 1,029 |
| Estimated Fair Value [Member] | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Surplus note | $ 784 | $ 885 |