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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
Jun. 30, 2014
Dec. 31, 2013
Maturity in:    
Amortized Cost, 2014 $ 70,301  
Amortized Cost, 2015-2019 75,893  
Total fixed-maturity securities, Amortized Cost 146,194 217,587
Estimated Fair Value, 2014 70,307  
Estimated Fair Value, 2015-2019 76,733  
Total fixed-maturity securities, Estimated Fair Value $ 147,040 $ 218,801