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Stockholders' Equity and Employee Stock Plans - Summary of RSU Activity Outstanding and Weighted Average Grant Date Fair Value (Detail)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Restricted Stock Units Outstanding, Unvested - Beginning Balance | shares 2,353,315
Number of Restricted Stock Units Outstanding, Granted | shares 785,400
Number of Restricted Stock Units Outstanding, Granted, performance RSUs | shares 438,980
Number of Restricted Stock Units Outstanding, Released | shares (407,535)
Number of Restricted Stock Units Outstanding, Cancelled or forfeited | shares (504,423)
Number of Restricted Stock Units Outstanding, Unvested - Ending Balance | shares 2,665,737
Weighted-Average Grant Date Fair Value, Unvested | $ / shares $ 47.42
Weighted-Average Grant Date Fair Value, Granted | $ / shares 43.31
Weighted-Average Grant Date Fair Value, Granted, performance RSUs | $ / shares 44.48
Weighted-Average Grant Date Fair Value, Released | $ / shares 41.49
Weighted-Average Grant Date Fair Value, Cancelled or forfeited | $ / shares 43.74
Weighted-Average Grant Date Fair Value, Unvested | $ / shares $ 47.33