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Schedule of Investment Income (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]
Investment income	$ 14,566	$ 8,856	$ 40,513	$ 18,593
Investment expense	(366)	(467)	(1,089)	(1,682)
Net investment income	14,200	8,389	39,424	16,911
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Investment income	12,961	9,595	36,734	23,466
Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Investment income	188	233	635	842
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Investment income	501	89	1,064	220
Other Invested Assets
Schedule Of Available For Sale Securities [Line Items]
Investment income	$ 916	$ (1,061)	$ 2,080	$ (5,935)

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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