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Investments - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Securities
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Securities
Sep. 30, 2014
USD ($)
Investments Schedule [Abstract]        
Individual fixed maturity held in unrealized loss position | Securities 121   121  
Individual fixed maturity held in unrealized loss position longer than 12 months | Securities 28   28  
Carrying value of investments $ 11,800   $ 11,800  
Number of fixed maturity securities to be deemed other-than-temporarily impaired | Securities 4   4  
Impairment losses recognized     $ 2,700 $ 200
Net realized gains/(losses) on investments $ 40 $ (152) $ (2,518) 181
Net realized gain(loss)outside OTTI       $ 400