Investments - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Securities	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Securities	Jun. 30, 2014 USD ($)
Investments Schedule [Abstract]
Individual fixed maturity held in unrealized loss position | Securities	205		205
Individual fixed maturity held in unrealized loss position longer than 12 months | Securities	22		22
Carrying value of investments	$ 11,700		$ 11,700
Number of fixed maturity securities to be deemed other-than-temporarily impaired | Securities	4		4
Net realized gains/(losses) on investments	$ (2,617)	$ 232	$ (2,558)	$ 333
Impairment losses recognized	$ 2,700		2,700
Net realized gain(loss)outside OTTI			$ 100