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Summary of Status of Awards Under Stock-Based Compensation Plans and Agreements (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Appreciation Rights
     
Awards      
Outstanding at beginning of year 13,530,642    
Granted 3,458,325    
Exercised (3,178,297)    
Cancelled (854,576)    
Outstanding at end of period 12,956,094 13,530,642  
Exercisable at end of period 3,539,501    
Weighted-average fair value of awards granted $ 13.47 $ 11.28 $ 10.97
Weighted average exercise price      
Outstanding at beginning of year $ 37.33    
Granted $ 59.38    
Exercised $ 27.45    
Cancelled $ 40.30    
Outstanding at end of period $ 45.44 $ 37.33  
Exercisable at end of period $ 31.98    
Weighted average remaining contractual life      
Outstanding at end of period 2 years 9 months 18 days    
Exercisable at end of period 1 year 4 months 24 days    
Stock Unit
     
Awards      
Outstanding at beginning of year 1,165,054    
Granted 42,651    
Exercised (172,260)    
Cancelled (68,849)    
Outstanding at end of period 966,596 1,165,054  
Exercisable at end of period 5,302    
Weighted-average fair value of awards granted $ 58.90 $ 54.85 $ 42.64
Weighted average remaining contractual life      
Outstanding at end of period 1 year 4 months 24 days    
Exercisable at end of period 6 months