Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less	$ 3,494	$ 5,726
Due after one year through five years	20,024	12,038
Due after five years through ten years	330	330
Amortized Cost, Total	23,848	18,094
Fair Value
Due in one year or less	3,494	5,722
Due after one year through five years	20,172	12,041
Due after five years through ten years	343	329
Fair Value, Total	$ 24,009	$ 18,092