Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available-for-sale
Due in one year or less, Amortized Cost	$ 687	$ 715
Due after one year through five years, Amortized Cost	49,439	25,973
Due after five years through ten years, Amortized Cost	80,498	56,448
Due after ten years, Amortized Cost	20,843	10,023
Mortgage-backed securities, Amortized Cost	14,528	3,004
Fixed-maturity securities, Cost or Amortized Cost	165,995	96,163
Due in one year or less, Fair Value	690	721
Due after one year through five years, Fair Value	49,605	26,093
Due after five years through ten years, Fair Value	79,836	56,847
Due after ten years, Fair Value	20,866	10,414
Mortgage-backed securities, Fair Value	14,438	3,009
Fair Value Total	$ 165,435	$ 97,084