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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 12,791 $ 16,934
Due after one year through five years 17,609 13,876
Due after five years 232 232
Amortized Cost, Total 30,632 31,042
Fair Value    
Due in one year or less 12,756 16,899
Due after one year through five years 17,325 13,708
Due after five years 234 241
Fair Value, Total $ 30,315 $ 30,848