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Investments - Additional Information (Detail) (USD $)
0 Months Ended 9 Months Ended
May 01, 2014
Sep. 30, 2014
Securities
Investments, Debt and Equity Securities [Abstract]    
Number of securities in unrealized loss position   38
Proceeds from sale of investment in fixed maturity securities   $ 200,000
Gross realized gains and losses of securities $ 0 $ 0
Investment security maturity date, start   May 01, 2014
Investment security maturity date, End   Sep. 30, 2014