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Subsequent Events - Additional Information (Detail) (USD $)
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9 Months Ended | |
|---|---|---|
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Sep. 30, 2012
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Oct. 22, 2012
Subsequent Event
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| Subsequent Event [Line Items] | ||
| Dividend payable, declaration date | Oct. 22, 2012 | |
| Dividend payable, amount | $ 0.27 | |
| Dividend payable, payable date | Nov. 07, 2012 | |
| Dividend payable, record date | Nov. 01, 2012 |