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Stock Plans - Summary of RSU Activity Outstanding and Weighted Average Grant Date Fair Value (Detail) - $ / shares
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of Restricted Stock Units Outstanding, Unvested - Beginning Balance 1,994,790  
Number of Restricted Stock Units Outstanding, Granted 1,361,494  
Number of Restricted Stock Units Outstanding, Granted, performance RSUs 301,900  
Number of Restricted Stock Units Outstanding, Released (624,512)  
Number of Restricted Stock Units Outstanding, Cancelled or forfeited (495,234)  
Number of Restricted Stock Units Outstanding, Unvested - Ending Balance 2,538,438  
Weighted-Average Grant Date Fair Value, Unvested $ 46.85 $ 51.42
Weighted-Average Grant Date Fair Value, Granted 43.50  
Weighted-Average Grant Date Fair Value, Granted, performance RSUs 41.96  
Weighted-Average Grant Date Fair Value, Released 49.60  
Weighted-Average Grant Date Fair Value, Cancelled or forfeited $ 49.60