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Other Benefit Plans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments, All Other Investments [Abstract]      
Cash value of life insurance contract $ 8,914,817 $ 8,680,519 $ 8,433,155
Income on their insurance investment total $ 234,297 $ 247,364 $ 239,524