Investments (Allowance for Credit Losses of Available-for-Sale Fixed-Maturity Securities) - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Dec. 31, 2024 |
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Fair Value Of Assets Held By Insurance Regulators | $ 1,801 | $ 1,794 | |
| Allowance for credit losses of available-for-sale debt securities | $ 0 | $ 0 | |