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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 357,960	$ 342,781	$ 647,194	$ 612,765
Ceded premiums written	(417,633)	(339,251)	(417,633)	(339,251)
Net premiums written	(59,673)	3,530	229,561	273,514
Direct premiums earned	303,108	274,027	598,485	536,288
Ceded premiums earned	(92,751)	(81,755)	(178,401)	(161,439)
Premiums earned, net	210,357	192,272	420,084	374,849
Direct losses and loss adjustment expenses	213,586	246,622	329,328	323,261
Ceded Losses and Loss Adjustment Expenses	(100,290)	(156,780)	(102,938)	(157,493)
Net Losses and Loss Adjustment Expenses	$ 113,296	$ 89,842	$ 226,390	$ 165,768

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