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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 404,685	$ 357,960	$ 739,238	$ 647,194
Ceded premiums written	(494,174)	(417,633)	(494,201)	(417,633)
Net premiums written	(89,489)	(59,673)	245,037	229,561
Direct premiums earned	337,639	303,108	663,590	598,485
Ceded premiums earned	(111,269)	(92,751)	(216,391)	(178,401)
Premiums earned, net	226,370	210,357	447,199	420,084
Direct losses and loss adjustment expenses	162,446	213,586	335,689	329,328
Ceded losses and loss adjustment expenses	(11,101)	(100,290)	(49,296)	(102,938)
Net Losses and Loss Adjustment Expenses	$ 151,345	$ 113,296	$ 286,393	$ 226,390

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