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Rollforward of Cumulative Other Than Temporary Credit Losses Recognized in Earnings for Debt Securities (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]      
Estimated credit losses, beginning of year $ 3,246,915 $ 3,246,915 $ 3,154,987
Credit losses - no previous OTTI recognized       70,000
Credit losses - previous OTTI recognized 15,581    21,928
Estimated credit losses, end of year $ 3,262,496 $ 3,246,915 $ 3,246,915