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Income Taxes - Dividends Per Share (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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| Common Dividends Declared Per Share [Line Items] | |||
| Amount Per Share | $ 0.500 | $ 0.600 | $ 0.640 |
| Dividends paid percentage | 100.00% | 100.00% | 100.00% |
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Non-qualified dividends [Member]
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| Common Dividends Declared Per Share [Line Items] | |||
| Amount Per Share | $ 0.477 | ||
| Dividends paid percentage | 74.53% | ||
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Qualified Dividends [Member]
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| Common Dividends Declared Per Share [Line Items] | |||
| Amount Per Share | $ 0.095 | ||
| Dividends paid percentage | 14.78% | ||
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Non-taxable return of capital [Member]
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| Common Dividends Declared Per Share [Line Items] | |||
| Amount Per Share | $ 0.500 | $ 0.600 | $ 0.068 |
| Dividends paid percentage | 100.00% | 100.00% | 10.69% |