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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 342,872	$ 309,176	$ 990,066	$ 921,941
Ceded premiums written	(4,781)	(17,256)	(422,414)	(356,507)
Net premiums written	338,091	291,920	567,652	565,434
Direct premiums earned	313,065	288,404	911,550	824,692
Ceded premiums earned	(106,466)	(99,466)	(284,867)	(260,905)
Premiums earned, net	206,599	188,938	626,683	563,787
Direct losses and loss adjustment expenses	334,440	270,158	663,768	593,419
Ceded Losses and Loss Adjustment Expenses	(201,869)	(184,211)	(304,807)	(341,704)
Net Losses and Loss Adjustment Expenses	$ 132,571	$ 85,947	$ 358,961	$ 251,715

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