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Weighted Average Per Share Grant-Date Fair Value (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted-average per share grant-date fair value      
Stock options $ 7.88 $ 9.43 $ 7.23
SARs $ 7.84 $ 9.89 $ 6.99