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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 396,481	$ 365,314
Ceded premiums written	(13,946)	(16,800)
Net premiums written	382,535	348,514
Direct premiums earned	414,603	375,606
Ceded premiums earned	(145,539)	(132,301)
Premiums earned, net	269,064	243,305
Direct losses and loss adjustment expenses	195,155	237,298
Ceded losses and loss adjustment expenses	(10,049)	(93,335)
Net Losses and Loss Adjustment Expenses	$ 185,106	$ 143,963

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