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Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options, Outstanding at beginning of year 12,928  
Options, Granted 2,425  
Options, Exercised (2,614)  
Options, Outstanding at December 31, 2015 [1] 12,739  
Options, Exercisable at December 31, 2015 7,798  
Weighted average exercise price, Outstanding at beginning of year $ 47.72  
Weighted average exercise price, Granted 82.90  
Weighted average exercise price, Exercised 31.74  
Weighted average exercise price, Outstanding at December 31, 2015 57.69  
Weighted average exercise price, Exercisable at December 31, 2015 $ 50.82  
Aggregate intrinsic value, Outstanding $ 305,810 $ 398,893
Aggregate intrinsic value, Exercisable as of December 31, 2015 $ 239,202  
[1] As of December 31, 2015 , approximately 12.6 million options are vested and expected to vest. Options expected to vest reflect an estimated forfeiture rate for purposes of determining related compensation expense.