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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 473,627	$ 404,685	$ 838,941	$ 739,238
Ceded premiums written	(568,489)	(494,174)	(585,289)	(494,201)
Net premiums written	(94,862)	(89,489)	253,652	245,037
Direct premiums earned	392,574	337,639	768,180	663,590
Ceded premiums earned	(136,402)	(111,269)	(268,703)	(216,391)
Premiums earned, net	256,172	226,370	499,477	447,199
Direct losses and loss adjustment expenses	276,302	162,446	513,600	335,689
Ceded losses and loss adjustment expenses	(109,081)	(11,101)	(202,416)	(49,296)
Net Losses and Loss Adjustment Expenses	$ 167,221	$ 151,345	$ 311,184	$ 286,393

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