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Stockholders' Equity and Employee Stock Plans - Summary of RSU Activity Outstanding and Weighted Average Grant Date Fair Value (Detail)
6 Months Ended
Jun. 30, 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 983,345
Number of Restricted Stock Units Outstanding, Granted, performance RSUs | shares 438,980
Number of Restricted Stock Units Outstanding, Released | shares (417,779)
Number of Restricted Stock Units Outstanding, Cancelled or forfeited | shares (646,181)
Number of Restricted Stock Units Outstanding, Unvested - Ending Balance | shares 2,711,680
Weighted-Average Grant Date Fair Value, Unvested | $ / shares $ 47.42
Weighted-Average Grant Date Fair Value, Granted | $ / shares 44.30
Weighted-Average Grant Date Fair Value, Granted, performance RSUs | $ / shares 44.48
Weighted-Average Grant Date Fair Value, Released | $ / shares 42.44
Weighted-Average Grant Date Fair Value, Cancelled or forfeited | $ / shares 43.90
Weighted-Average Grant Date Fair Value, Unvested | $ / shares $ 47.70