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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 365,314	$ 334,553
Ceded premiums written	(16,800)	(27)
Net premiums written	348,514	334,526
Direct premiums earned	375,606	325,951
Ceded premiums earned	(132,301)	(105,122)
Premiums earned, net	243,305	220,829
Direct losses and loss adjustment expenses	237,298	173,243
Ceded losses and loss adjustment expenses	(93,335)	(38,195)
Net Losses and Loss Adjustment Expenses	$ 143,963	$ 135,048

X

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