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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, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Maturity in: |  |
Amortized Cost, 2014 | $ 63,371 |
Amortized Cost, 2015-2019 | 73,083 |
Total fixed-maturity securities, Amortized Cost | 136,454 | 217,587
Estimated Fair Value, 2014 | 63,368 |
Estimated Fair Value, 2015-2019 | 73,648 |
Total fixed-maturity securities, Estimated Fair Value | $ 137,016 | $ 218,801

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