XML 97 R81.htm IDEA: XBRL DOCUMENT v3.6.0.2
Common Stock - Summary of Information and Changes in Stock Options with Regard to Stock Option Plans (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Number of shares under stock option, Beginning of the year 15,430,307 10,881,133 11,535,566
Number of Shares Granted 3,672,411 5,746,153 3,389,547
Number of Shares Cancelled (1,517,065) (886,356) (498,967)
Number of Shares Exercised (146,593) (310,623) (1,977,665)
Number of shares under stock option, End of the year 17,439,060 15,430,307 10,881,133
Number of stock options, Vested or expected to vest 17,212,352    
Number of stock options, Exercisable 9,828,897 7,498,414 5,903,712
Weighted Average Exercise Price, Beginning of year $ 59.50 $ 61.22 $ 58.36
Weighted Average Exercise Price, Stock Options Granted 28.26 54.74 69.00
Weighted Average Exercise Price, Stock Options Cancelled 49.95 62.73 70.32
Weighted Average Exercise Price, Stock Options Exercised 28.53 22.56 53.56
Weighted Average Exercise Price, End of the year 54.08 59.50 61.22
Weighted Average Exercise Price, Stock options vested or expected to vest 54.08    
Weighted Average Exercise Price, Stock Options, Exercisable $ 61.56 $ 60.30 $ 55.06
Weighted Average Remaining Contractual Term, Outstanding 6 years 9 months 4 days 5 years 1 month 28 days  
Weighted Average Remaining Contractual Term, Vested 6 years 9 months 4 days    
Weighted Average Remaining Contractual Term, Exercisable 5 years 5 months 1 day    
Stock Options Aggregate Intrinsic Value, Beginning $ 5,894,977    
Stock Options Aggregate Intrinsic Value, Granted $ 0    
Stock Options Aggregate Intrinsic Value, Ending $ 37,928,494 $ 5,894,977  
Stock Options Average Aggregate Intrinsic Value, Vested or expected to Vest 37,408,874    
Stock Options Average Aggregate Intrinsic Value, Exercisable $ 6,700,856