Investments - Investment Income (Loss) Summarized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule Of Investments [Line Items]
Recognized investment income	$ 195	$ 553
Real estate investments	1,493	9,293
Net Investment Income	14,067	17,715
Available-for-Sale-Fixed-Maturity Securities [Member]
Schedule Of Investments [Line Items]
Investment income	4,827	4,035
Equity Securities [Member]
Schedule Of Investments [Line Items]
Investment income	442	296
Investment Expense [Member]
Schedule Of Investments [Line Items]
Investment expense	(79)	(129)
Limited Partnership Investment [Member]
Schedule Of Investments [Line Items]
Recognized investment income	195	553
Cash and Cash Equivalents [Member]
Schedule Of Investments [Line Items]
Investment income	$ 7,189	$ 3,667