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Share-Based Compensation Plans - Summary of Share Options Granted Under Plan (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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| Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward] | |||
| Shares Outstanding, Beginning | 112,500 | 94,750 | 90,750 |
| Stock options and Granted | 30,000 | 27,000 | |
| Stock options and Expired | (14,000) | (12,250) | (23,000) |
| Outstanding and exercisable | 98,500 | 112,500 | 94,750 |
| Weighted-average fair value per share of stock options granted during the year | $ 0.40 | $ 1.10 | |
| Weighted average Exercise Price, Beginning | $ 8.21 | $ 9.09 | $ 10.11 |
| Stock options and Granted, Weighted Average Exercise Price Per Award | $ 7.80 | $ 8.75 | |
| Stock options and Expired, Weighted Average Exercise Price Per Award | $ 7.65 | $ 14.01 | $ 12.72 |
| Outstanding and exercisable, weighted average exercise price | $ 8.29 | $ 8.21 | $ 9.09 |