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Investment Securities - Summary of Sale of Investment Securities and Losses (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Investments Debt And Equity Securities [Abstract] | |||
| Proceeds from the Disposition of Investment Securities | $ 6,929,493 | ||
| Cost Basis of Investment Securities Sold | (7,069,929) | ||
| Loss recognized in Statement of Operations on the Disposition of Investment Securities | $ (140,436) | ||