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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Fixed-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Investments Debt And Equity Securities [Abstract] |  |
Amortized Cost, 2016 | $ 74,767 |
Amortized Cost, 2017-2019 | 24,321 |
Total fixed-maturity securities, Amortized Cost | 99,088 | $ 60,202
Estimated Fair Value, 2016 | 74,789 |
Estimated Fair Value, 2017-2019 | 24,266 |
Total fixed-maturity securities, Estimated Fair Value | $ 99,055 | $ 60,641

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