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Subsequent Events - Additional information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Oct. 29, 2012
Subsequent Event [Member]
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| Dividends declared per share | $ 0.30 | $ 0.20 | $ 0.90 | $ 0.53 | $ 0.30 |
| Cash dividends, date payable | Nov. 28, 2012 | ||||
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- Definition
Cash dividends, date payable. No definition available.
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- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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