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Investments - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Securities
Investments, Debt and Equity Securities [Abstract]  
Number of securities in unrealized loss position 38us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Proceeds from sale of investment in fixed maturity securities $ 200,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Gross realized gains and losses of securities $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Investment security maturity date Dec. 31, 2014