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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 309,176	$ 274,744	$ 921,941	$ 816,350
Ceded premiums written	(17,256)	(7,303)	(356,507)	(318,827)
Net premiums written	291,920	267,441	565,434	497,523
Direct premiums earned	288,404	254,809	824,692	735,807
Ceded premiums earned	(99,466)	(80,292)	(260,905)	(230,722)
Premiums earned, net	188,938	174,517	563,787	505,085
Direct Losses and Loss Adjustment Expenses	270,158	531,268	593,419	687,707
Ceded Losses and Loss Adjustment Expenses	(184,211)	(414,893)	(341,704)	(420,578)
Net Losses and Loss Adjustment Expenses	$ 85,947	$ 116,375	$ 251,715	$ 267,129

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