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Share-Based Payment Award Activity (Parenthetical) (Detail) (USD $)
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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|---|---|---|---|
| Intrinsic value represents the excess of the closing stock price related to options outstanding | $ 12.81 | $ 10.48 | $ 7.40 |
| X | ||||||||||
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- Definition
The excess of the closing stock price on the last day of the trading period over the exercise price. No definition available.
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