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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 410,102	$ 396,481
Ceded premiums written	(14,776)	(13,946)
Net premiums written	395,326	382,535
Direct premiums earned	455,368	414,603
Ceded premiums earned	(173,144)	(145,539)
Premiums earned, net	282,224	269,064
Direct losses and loss adjustment expenses	208,222	195,155
Ceded losses and loss adjustment expenses	(2,068)	(10,049)
Net Losses and Loss Adjustment Expenses	$ 206,154	$ 185,106

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