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Schedule of Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule Of Available For Sale Securities [Line Items]
Investment income	$ 13,567	$ 2,541	$ 25,947	$ 9,737
Investment expense	(351)	(611)	(723)	(1,215)
Net investment income	13,216	1,930	25,224	8,522
Fixed Income Securities
Schedule Of Available For Sale Securities [Line Items]
Investment income	12,313	7,467	23,773	13,871
Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Investment income	257	275	447	609
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Investment income	300	99	563	131
Other Invested Assets
Schedule Of Available For Sale Securities [Line Items]
Investment income	$ 697	$ (5,300)	$ 1,164	$ (4,874)

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