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Fair Value Measurements - Summary of Carrying Amounts and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities, fair value	$ 430,353	$ 473,092
Fixed maturity securities-available-for-sale	315,114	317,064
Equity securities	57,712	57,147
Short-term investments	26,337	0
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities, fair value	436,369	483,575
Fixed maturity securities-available-for-sale	315,114	317,064
Equity securities	57,712	57,147
Short-term investments	26,337	0
Cash and cash equivalents	63,663	38,682
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities, fair value	430,353	473,092
Fixed maturity securities-available-for-sale	315,114	317,064
Equity securities	57,712	57,147
Short-term investments	26,337	0
Cash and cash equivalents	$ 63,663	$ 38,682

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