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Subsequent Events - Additional Information (Detail) (USD $)
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12 Months Ended | 1 Months Ended | |
|---|---|---|---|
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Feb. 02, 2013
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Feb. 18, 2013
Subsequent Event
Dividend Declared
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Feb. 18, 2013
Subsequent Event
Dividend Paid
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| Subsequent Event [Line Items] | |||
| Cash dividend, per share | $ 0.80 | $ 0.275 | |
| Cash dividend, payment date | Mar. 19, 2013 | ||
| Cash dividend, date of record | Mar. 05, 2013 | ||