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Components of Net Realized Investment Gains (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Total net realized investment gains | $ 127 | $ 205 | $ 263 | $ 1,052
Equity securities, Gross realized gains | 161 | 214 | 284 | 1,089
Equity securities, Gross realized losses | 0 | (2) | 0 | (5)
Net realized gains (losses) | 161 | 212 | 284 | 1,084
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Gross realized gains | 47 | 43 | 61 | 49
Gross realized losses | (81) | (50) | (82) | (81)
Total net realized investment gains | $ (34) | $ (7) | $ (21) | $ (32)

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