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Common Stock and Earnings Per Share - Additional Information (Detail) (USD $)
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12 Months Ended | 0 Months Ended | 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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Apr. 26, 2012
Common Stock [Member]
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Dec. 31, 2013
Common Stock [Member]
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Apr. 26, 2012
Common Stock [Member]
Maximum [Member]
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| Net Income Per Share [Line Items] | ||||||
| Antidilutive potentially securities | 58,800 | 198,300 | 205,113 | |||
| Number of shares to be purchased by the company from shareholders | 100 | |||||
| Number of shares purchased | 14,634 | |||||
| Total cost paid by company associated with the Program and purchased | $ 453,654 | |||||
| Share repurchase program expiration date | 2012-06 | |||||