Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less	$ 3,753	$ 5,726
Due after one year through five years	25,833	12,038
Due after five years through ten years	330	330
Amortized Cost, Total	29,916	18,094
Fair Value
Due in one year or less	3,760	5,722
Due after one year through five years	25,951	12,041
Due after five years through ten years	356	329
Fair Value, Total	$ 30,067	$ 18,092