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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Shares subject to option    
Beginning Balance (shares) 48,420,255  
Granted (shares) 0  
Exercised (shares) (10,862,315)  
Canceled/Expired (shares) (1,822,676)  
Ending Balance (shares) 35,735,264 48,420,255
Vested and expected to vest (shares) 35,734,694  
Exercisable (shares) 33,703,283  
Weighted-average exercise price    
Beginning Balance (usd per share) $ 33.06  
Granted (usd per share) 0.00  
Exercised (usd per share) 30.15  
Canceled/Expired (usd per share) 40.36  
Ending Balance (usd per share) 33.57 $ 33.06
Vested and expected to vest (usd per share) 33.57  
Exercisable (usd per share) $ 34.27  
Weighted-average remaining contractual term (in years)    
Weighted- average remaining contractual term (in years) 3 years 4 months 24 days 4 years 2 months 12 days
Vested and expected to vest 3 years 4 months 24 days  
Exercisable 3 years 2 months 12 days