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Stockholders' Equity And Benefit Plans (Schedule Of Stock Options And Stock Appreciation Rights Outstanding And Exercisable) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 1,201 1,193
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 61.81 $ 61.03
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 6 years 3 months 18 days 6 years 7 months 6 days
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 543  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 37.36  
Range Of Exercise Prices $11.66 - $13.15 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 20  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 11.70  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 8 months 12 days  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 20  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 11.70  
Range Of Exercise Prices $13.15 - $26.29 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 323  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 18.77  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 4 years 3 months 18 days  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 232  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 20.67  
Range Of Exercise Prices $26.29 - $39.44 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 310  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 34.46  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 5 years 9 months 18 days  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 177  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 33.57  
Range Of Exercise Prices $39.44 - $52.58 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 32  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 43.12  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 5 years 6 months  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 32  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 43.12  
Range Of Exercise Prices $65.73 - $78.88 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 4  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 69.53  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 8 years 6 months  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 1  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 69.53  
Range Of Exercise Prices $78.88 - $92.02 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 202  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 81.23  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 8 years 2 months 12 days  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 47  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 81.23  
Range Of Exercise Prices $92.02 - $105.17 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 6  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 93.29  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 8 years 9 months 18 days  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 2  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 93.29  
Range Of Exercise Prices $118.31 - $131.46 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options and Stock Appreciation Rights Outstanding, Number Of Shares 304  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price $ 127.35  
Stock Options and Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 8 years 3 months 18 days  
Stock Options and Stock Appreciation Rights Exercisable, Number Of Shares 32  
Stock Options and Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price $ 121.73