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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 274,744	$ 241,888	$ 816,350	$ 741,782
Ceded premiums written	(7,303)	(151,432)	(318,827)	(298,365)
Net premiums written	267,441	90,456	497,523	443,417
Direct premiums earned	254,809	234,500	735,807	682,571
Ceded premiums earned	(80,292)	(74,966)	(230,722)	(214,128)
Premiums earned, net	174,517	159,534	505,085	468,443
Direct Losses and Loss Adjustment Expenses	531,268	73,487	687,707	198,069
Ceded Losses and Loss Adjustment Expenses	(414,893)	61	(420,578)	1,680
Net Losses and Loss Adjustment Expenses	$ 116,375	$ 73,548	$ 267,129	$ 199,749

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