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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Total net realized investment gains (losses) |  | $ (133) | $ 2,234 | $ (2,414) | $ (33,067)
Equity securities, Gross realized gains |  | 163 | 159 | 726 | 1,803
Equity securities, Gross realized losses |  | (178) | (219) | (1,829) | (5,623)
Equity securities, Total net realized investment gains (losses) |  | (15) | (60) | (1,103) | (3,820)
Not Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Gross realized gains |  | 0 | 2,906 | 0 | 11,867
Gross realized losses |  | 0 | (353) | 0 | (2,774)
Total net realized investment gains (losses) | [1] | 0 | 2,553 | 0 | 9,093
Fixed Income Securities |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |
Gross realized gains |  | 15 | 226 | 29 | 512
Gross realized losses |  | (133) | (485) | (1,340) | (38,852)
Total net realized investment gains (losses) |  | $ (118) | $ (259) | $ (1,311) | $ (38,340)
[1] | Includes periodic net interest settlements related to the derivatives of $0.5 million for the quarters ended September 30, 2022 and $3.0 million for the nine months ended September 30, 2022.

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