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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule Of Available For Sale Securities [Line Items] |  |
Total net realized investment gains (losses) | $ 847 | $ (1,520)
Equity securities, Gross realized gains | 875 | 627
Equity securities, Gross realized losses | (3) | (1,541)
Equity securities, Total net realized investment gains (losses) | 872 | (914)
Fixed Income Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Gross realized gains | 6 | 5
Gross realized losses | (31) | (611)
Total net realized investment gains (losses) | $ (25) | $ (606)

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