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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 432,984	$ 409,418	$ 1,271,925	$ 1,148,656
Ceded premiums written	(124)	(3,062)	(585,413)	(497,263)
Net premiums written	432,860	406,356	686,512	651,393
Direct premiums earned	410,621	357,208	1,178,801	1,020,798
Ceded premiums earned	(145,967)	(123,017)	(414,670)	(339,408)
Premiums earned, net	264,654	234,191	764,131	681,390
Direct losses and loss adjustment expenses	264,068	347,207	777,668	682,896
Ceded losses and loss adjustment expenses	(76,487)	(108,730)	(278,903)	(158,026)
Net Losses and Loss Adjustment Expenses	$ 187,581	$ 238,477	$ 498,765	$ 524,870

X

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