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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 269,984	$ 245,415
Ceded premiums written		(186)
Net premiums written	269,984	245,229
Direct premiums earned	262,261	236,375
Ceded premiums earned	(79,684)	(74,816)
Premiums earned, net	182,577	161,559
Direct Losses and Loss Adjustment Expenses	76,639	70,783
Ceded Losses and Loss Adjustment Expenses	(713)	(213)
Net Losses and Loss Adjustment Expenses	$ 75,926	$ 70,570

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