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Share-Based Compensation Plans - Summary of Changes in Outstanding RSUs and Restricted Stock (Detail) (Restricted Stock [Member], 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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Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Balance, Beginning | 6,666 | 11,031 | 12,066 |
| Granted | 6,666 | 15,000 | 15,000 |
| Vested | (6,666) | (19,365) | (16,035) |
| Forfeited | |||
| Balance, Ending | 6,666 | 6,666 | 11,031 |
| Weighted Average Fair Value at Grant Date, Beginning Balance | $ 7.75 | $ 8.57 | $ 8.35 |
| Weighted Average Fair Value at Grant Date, Granted | $ 7.06 | $ 7.45 | $ 8.73 |
| Weighted Average Fair Value at Grant Date, Vested | $ 7.74 | $ 7.98 | $ 8.55 |
| Weighted Average Fair Value at Grant Date, Forfeited | |||
| Weighted Average Fair Value at Grant Date, Ending Balance | $ 7.13 | $ 7.75 | $ 8.57 |