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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	Mar. 31, 2014	Dec. 31, 2013
Maturity in:
Amortized Cost, 2014	$ 120,156
Amortized Cost, 2015-2019	94,040
Amortized Cost, 2020-2023	1,003
Amortized Cost, Thereafter
Total fixed-maturity securities, Amortized Cost	215,199	217,587
Estimated Fair Value, 2014	120,186
Estimated Fair Value, 2015-2019	95,265
Estimated Fair Value, 2020-2023	1,029
Estimated Fair Value, Thereafter
Total fixed-maturity securities, Estimated Fair Value	$ 216,480	$ 218,801

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