Deferred Policy Acquisition Costs - Summary of Activity in Deferred Policy Acquisition Costs (DPAC) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Insurance [Abstract]
Beginning Balance	$ 42,568	$ 31,948	$ 34,800	$ 24,370
Policy acquisition costs deferred	22,158	16,058	68,807	48,982
Amortization	(22,597)	(15,512)	(61,478)	(40,858)
Ending Balance	$ 42,129	$ 32,494	$ 42,129	$ 32,494