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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 342,781	$ 296,191	$ 612,765	$ 541,606
Ceded premiums written	(339,251)	(311,338)	(339,251)	(311,524)
Net premiums written	3,530	(15,147)	273,514	230,082
Direct premiums earned	274,027	244,623	536,288	480,998
Ceded premiums earned	(81,755)	(75,614)	(161,439)	(150,430)
Premiums earned, net	192,272	169,009	374,849	330,568
Direct Losses and Loss Adjustment Expenses	246,622	85,656	323,261	156,439
Ceded Losses and Loss Adjustment Expenses	(156,780)	(5,472)	(157,493)	(5,685)
Net Losses and Loss Adjustment Expenses	$ 89,842	$ 80,184	$ 165,768	$ 150,754

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