XML 77 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options, Outstanding at beginning of year 12,578  
Options, Granted 2,465  
Options, Exercised (1,901)  
Options, Outstanding at December 31, 2017 13,142  
Options, Exercisable at December 31, 2017 7,932  
Weighted average exercise price, Outstanding at beginning of year $ 66.54  
Weighted average exercise price, Granted 109.36  
Weighted average exercise price, Exercised 56.87  
Weighted average exercise price, Outstanding at December 31, 2017 75.97  
Weighted average exercise price, Exercisable at December 31, 2017 $ 66.45  
Aggregate intrinsic value, Outstanding $ 381,022 $ 225,384
Aggregate intrinsic value, Exercisable as of December 31, 2017 $ 299,045