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Subsequent Events - Additional Information (Detail) (USD $)
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3 Months Ended | 1 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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Apr. 29, 2013
Subsequent Event [Member]
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| Dividend declared per common share | $ 0.30 | $ 0.30 | $ 0.30 |
| Dividend declaration date | Feb. 19, 2013 | Apr. 29, 2013 | |
| Dividend payment date | Mar. 19, 2013 | May 28, 2013 | |
| Dividend date of record | May 14, 2013 | ||
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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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- Definition
Date the declared dividend will be paid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Date the dividend to be paid was declared, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. No definition available.
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