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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 | Jun. 30, 2015 | Dec. 31, 2014
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Maturity in: |  |
Amortized Cost, 2015 | $ 71,576 |
Amortized Cost, 2016-2019 | 35,612 |
Total fixed-maturity securities, Amortized Cost | 107,188 | $ 60,202
Estimated Fair Value, 2015 | 71,595 |
Estimated Fair Value, 2016-2019 | 35,749 |
Total fixed-maturity securities, Estimated Fair Value | $ 107,344 | $ 60,641

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