v3.3.1.900
Stock-Based Compensation - Restricted Stock and RSU Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock and RSUs, beginning of period 3,401,909    
Restricted Stock and RSUs, Granted 1,377,263    
Restricted Stock and RSUs, Converted (1,639,078)    
Restricted Stock and RSUs, Forfeited (72,357)    
Restricted Stock and RSUs, end of period 3,067,737 3,401,909  
Weighted-Average Grant Date Fair Value, beginning of period $ 257.01    
Weighted-Average Grant Date Fair Value, Granted 343.49    
Weighted-Average Grant Date Fair Value, Converted 231.26    
Weighted-Average Grant Date Fair Value, Forfeited 306.41    
Weighted-Average Grant Date Fair Value, end of period $ 308.42 $ 257.01  
Market Performance-based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock and RSUs, beginning of period 1,425,319    
Restricted Stock and RSUs, Granted 0 315,961 556,581
Restricted Stock and RSUs, Forfeited (47,142)    
Restricted Stock and RSUs, end of period 1,378,177 1,425,319  
Weighted-Average Grant Date Fair Value, beginning of period $ 137.31    
Weighted-Average Grant Date Fair Value, Forfeited 144.27    
Weighted-Average Grant Date Fair Value, end of period $ 137.07 $ 137.31  
Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock and RSUs, beginning of period 0    
Restricted Stock and RSUs, Granted 262,847    
Restricted Stock and RSUs, Forfeited (6,979)    
Restricted Stock and RSUs, end of period 255,868 0  
Weighted-Average Grant Date Fair Value, beginning of period $ 0    
Weighted-Average Grant Date Fair Value, Granted 343.86    
Weighted-Average Grant Date Fair Value, Forfeited 343.86    
Weighted-Average Grant Date Fair Value, end of period $ 343.86 $ 0