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Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Available-for-sale    
Due in one year or less, Amortized Cost $ 4,624 $ 3,282
Due after one year through five years, Amortized Cost 43,676 32,833
Due after five years through ten years, Amortized Cost 93,633 71,120
Due after ten years, Amortized Cost 25,290 21,379
Fixed-maturity securities, Cost or Amortized Cost 167,223 128,614
Due in one year or less, Fair Value 4,642 3,292
Due after one year through five years, Fair Value 44,090 32,651
Due after five years through ten years, Fair Value 94,684 67,113
Due after ten years, Fair Value 26,600 21,953
Fair Value Total $ 170,016 $ 125,009