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Reinsurance - Impact of the Reinsurance Treaties on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Premiums Written:
Direct	$ 93,282	$ 105,787	$ 308,682	$ 343,927
Assumed	(18)	(416)	(377)	(1,792)
Gross written	93,264	105,371	308,305	342,135
Ceded	(29,242)	(41,077)	(105,998)	(100,294)
Net premiums written	64,022	64,294	202,307	241,841
Premiums Earned:
Direct	92,112	93,012	283,011	263,814
Assumed	430	10,830	3,262	57,360
Gross earned	92,542	103,842	286,273	321,174
Ceded	(29,242)	(41,077)	(105,998)	(100,294)
Net premiums earned	$ 63,300	$ 62,765	$ 180,275	$ 220,880

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