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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	Dec. 31, 2013	Dec. 31, 2012
Maturity in:
Amortized Cost, 2014	$ 120,536
Amortized Cost, 2015-2018	92,692
Amortized Cost, 2019-2023	4,359
Amortized Cost, Thereafter
Total fixed-maturity securities, Amortized Cost	217,587	272,895
Estimated Fair Value, 2014	120,604
Estimated Fair Value, 2015-2018	93,944
Estimated Fair Value, 2019-2023	4,253
Estimated Fair Value, Thereafter
Total fixed-maturity securities, Estimated Fair Value	$ 218,801	$ 277,469

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