XML 125 R106.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-based compensation - Summary of Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares subject to option      
Beginning Balance (shares) 35,735,264    
Granted (shares) 0 0 0
Exercised (shares) (12,746,946)    
Canceled/Expired (shares) (1,746,750)    
Ending Balance (shares) 21,241,568 35,735,264  
Vested and expected to vest (shares) 21,241,568    
Exercisable (shares) 21,241,568    
Weighted-average exercise price      
Beginning Balance (usd per share) $ 33.57    
Granted (usd per share) 0.00    
Exercised (usd per share) 34.17    
Canceled/Expired (usd per share) 41.38    
Ending Balance (usd per share) 32.57 $ 33.57  
Vested and expected to vest (usd per share) 32.57    
Exercisable (usd per share) $ 32.57    
Weighted-average remaining contractual term (in years)      
Weighted- average remaining contractual term (in years) 2 years 9 months 18 days 3 years 4 months 24 days  
Vested and expected to vest 2 years 9 months 18 days    
Exercisable 2 years 9 months 18 days