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Fair Values of Financial Instruments - Summary of Carrying or Reported Values and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fixed maturity securities--held-to-maturity | $ 399,721 | $ 473,092
Fixed maturity securities-available-for-sale, at fair value (amortized cost $318,975, allowance for credit losses of $0 in 2024 and amortized cost $326,171, allowance for credit losses of $0 in 2023) | 307,750 | 317,064
Equity securities, at fair value (cost $36,020 and $44,046 in 2024 and 2023, respectively) | 58,629 | 57,147
Short-term investments | 9,338 |
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fixed maturity securities--held-to-maturity | 413,061 | 483,575
Fixed maturity securities-available-for-sale, at fair value (amortized cost $318,975, allowance for credit losses of $0 in 2024 and amortized cost $326,171, allowance for credit losses of $0 in 2023) | 307,750 | 317,064
Equity securities, at fair value (cost $36,020 and $44,046 in 2024 and 2023, respectively) | 58,629 | 57,147
Short-term investments | 9,338 |
Cash and cash equivalents | 44,045 | 38,682
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fixed maturity securities--held-to-maturity | 399,721 | 473,092
Fixed maturity securities-available-for-sale, at fair value (amortized cost $318,975, allowance for credit losses of $0 in 2024 and amortized cost $326,171, allowance for credit losses of $0 in 2023) | 307,750 | 317,064
Equity securities, at fair value (cost $36,020 and $44,046 in 2024 and 2023, respectively) | 58,629 | 57,147
Short-term investments | 9,338 |
Cash and cash equivalents | $ 44,045 | $ 38,682

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