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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Total net realized investment gains (losses) | $ 205 | $ (761) | $ 1,052 | $ (2,281)
Equity securities, Gross realized gains | 214 | 209 | 1,089 | 784
Equity securities, Gross realized losses | (2) | (383) | (5) | (1,872)
Equity securities, Total net realized investment gains (losses) | 212 | (174) | 1,084 | (1,088)
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Gross realized gains | 43 | 9 | 49 | 14
Gross realized losses | (50) | (596) | (81) | (1,207)
Total net realized investment gains (losses) | $ (7) | $ (587) | $ (32) | $ (1,193)

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