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Employee Benefit Plans - Schedule of Weighted Average Assumptions of Fair Value of Option Granted (Detail) (2012 Option Grants January [Member])
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12 Months Ended |
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Dec. 31, 2013
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2012 Option Grants January [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Dividend yield | 5.07% |
| Expected life | 8 years 6 months |
| Expected volatility | 69.22% |
| Risk-free interest rate | 1.41% |