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Summary of Status of Awards Under Stock-Based Compensation Plans and Agreements (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Appreciation Rights      
Awards      
Outstanding at beginning of year 10,585,172    
Granted 993,953    
Exercised (2,409,579)    
Cancelled (635,985)    
Outstanding at end of period 8,533,561 10,585,172  
Exercisable at end of period 2,856,959    
Weighted-average fair value of awards granted $ 17.97 $ 16.41 $ 13.47
Weighted average exercise price      
Outstanding at beginning of year 53.21    
Granted 81.22    
Exercised 41.62    
Cancelled 62.42    
Outstanding at end of period 59.05 $ 53.21  
Exercisable at end of period $ 47.88    
Weighted average remaining contractual life      
Outstanding at end of period 2 years 3 months 18 days    
Exercisable at end of period 1 year 2 months 12 days    
Stock Unit      
Awards      
Outstanding at beginning of year 921,898    
Granted 279,485    
Exercised (348,127)    
Cancelled (88,196)    
Outstanding at end of period 765,060 921,898  
Weighted-average fair value of awards granted $ 80.25 $ 72.24 $ 58.90
Weighted average remaining contractual life      
Outstanding at end of period 4 months 24 days    
Exercisable at end of period 0 years