Deferred Policy Acquisition Costs - Summary of Activity in Deferred Policy Acquisition Costs (DPAC) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Insurance [Abstract]
Beginning balance	$ 25,843	$ 12,226	$ 24,370	$ 9,765
Deferred Policy acquisition costs	18,358	19,550	32,924	26,484
Amortization	(12,253)	(6,384)	(25,346)	(10,857)
Ending balance	$ 31,948	$ 25,392	$ 31,948	$ 25,392