XML 81 R80.htm IDEA: XBRL DOCUMENT v2.4.0.6
Common Stock - Summary of Information and Changes in Stock Options with Regard to Stock Option Plans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Number of shares under stock option, Beginning of the year 10,481,750 11,039,544 10,255,982
Number of Shares Granted 2,239,088 2,277,946 3,485,283
Number of Shares Cancelled (228,137) (241,174) (232,488)
Number of Shares Exercised (3,019,219) (2,594,566) (2,469,233)
Number of shares under stock option, End of the year 9,473,482 10,481,750 11,039,544
Number of stock options vested and expected to be vest 9,321,906    
Number of stock options vested and expected to be vest, exercisable 4,823,331 5,073,965 5,067,186
Weighted average exercise price, Beginning of year $ 47.20 $ 38.01 $ 34.19
Stock options granted, weighted average exercise price $ 84.58 $ 79.68 $ 44.03
Stock options cancelled, weighted average exercise $ 60.28 $ 40.20 $ 40.53
Stock options exercised, weighted average exercise $ 82.26 $ 36.84 $ 30.35
Weighted average exercise price, End of the year $ 58.69 $ 47.20 $ 38.01
Stock options vested or expected to be vest, weighted average exercise price $ 58.69    
Stock options vested or expected to be vest exercisable, weighted average exercise price $ 43.99 $ 38.47 $ 36.31
Weighted Remaining Contractual Term, Outstanding 6 years 10 months 10 days 7 years 11 days  
Weighted Remaining Contractual Term, Vested 6 years 10 months 10 days    
Weighted Remaining Contractual Term, Exercisable 5 years 4 months 17 days    
Stock options aggregate intrinsic value $ 150,667,018 $ 217,950,989  
Stock options, vested and expected to vest, aggregate intrinsic value 148,256,346    
Stock options, vested and expected to vest exercisable, aggregate intrinsic value $ 125,192,433