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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 | Sep. 30, 2017 | Dec. 31, 2016
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Investments Debt And Equity Securities [Abstract] |  |
Amortized Cost, 2017 | $ 6,750 |
Amortized Cost, 2018 | 3,682 |
Total fixed-maturity securities, Amortized Cost | 10,432 | $ 76,912
Estimated Fair Value, 2017 | 6,749 |
Estimated Fair Value, 2018 | 3,673 |
Total fixed-maturity securities, Estimated Fair Value | $ 10,422 | $ 76,831

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