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Stock-Based Compensation (Summary Of Stock Appreciation Rights Activity) (Detail) (Stock Appreciation Rights [Member], USD $)
9 Months Ended
Sep. 30, 2012
Stock Appreciation Rights [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding at December 31, 2011 525,600
Number of Shares, Granted 387,400
Number of Shares, Forfeited (29,400)
Number of Shares, Outstanding at September 30, 2012 883,600
Weighted Average Exercise Price, Outstanding at December 31, 2011 $ 24.40
Weighted Average Exercise Price, Granted $ 23.20
Weighted Average Exercise Price, Forfeited $ 23.20
Weighted Average Exercise Price, Outstanding at September 30, 2012 $ 23.91
Weighted Average Remaining Contractual Term (in years), Outstanding at September 30, 2012 9 years 2 months 23 days
Aggregate Intrinsic Value, Outstanding at September 30, 2012 $ 28.7 [1]
Closing stock price of common stock $ 56.35
[1] The aggregate intrinsic value is calculated as the pre-tax difference between the exercise price of the underlying awards and the closing price per share of $56.35 of the Company's common stock on September 28, 2012. The amount is presented in millions.