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Employee Stock Plans - Stock Award Activity (Detail) - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding Beginning balance, Number of Options 2,412
Exercised or released, Number of Options (327)
Expired or canceled, Number of Options (8)
Outstanding Ending balance, Number of Options 2,077
Exercisable Ending balance, Number of Options 1,605
Outstanding Beginning balance, Weighted Average Exercise Price Per Share $ 13.58
Exercised or released, Weighted Average Exercise Price Per Share 9.88
Expired or canceled, Weighted Average Exercise Price Per Share 18.15
Outstanding Ending balance, Weighted Average Exercise Price Per Share 14.14
Exercisable Ending balance, Weighted Average Exercise Price $ 12.96
Restricted Stock Units and Awards [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding Beginning balance, Number of Shares 577
Granted, Number of Shares 178
Exercised or released, Number of Shares (276)
Expired or canceled, Number of Shares (9)
Outstanding Ending balance, Number of Shares 470
Outstanding Beginning balance, Weighted Average Grant-Date Fair Value [1] $ 17.87
Granted, Weighted Average Grant-Date Fair Value [1] 24.48
Exercised or released, Weighted Average Grant Date Fair Value [1] 16.74
Expired or Canceled, Weighted Average Grant-Date Fair Value [1] 20.96
Outstanding Ending balance, Weighted Average Grant-Date Fair Value [1] $ 20.97
[1]

Represents weighted average market value of the shares; awards are granted at no cost to the recipients.