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Summary of Company's Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of Shares  
Options Outstanding, Beginning Balance | shares 19,868,781
Granted | shares 3,502,129
Exercised | shares (3,880,757)
Cancelled/forfeited | shares (2,062,925)
Options Outstanding, Ending Balance | shares 17,427,228
Vested at December 31, 2019 | shares 8,622,679
Unvested at December 31, 2019 | shares 8,804,549
Exercisable | shares 8,622,679
Weighted Average Exercise Prices  
Weighted Average Exercise Prices, Beginning Balance | $ / shares $ 28.04
Weighted Average Exercise Prices, granted | $ / shares 28.22
Weighted Average Exercise Prices, exercised | $ / shares 24.73
Weighted Average Exercise Prices, Cancelled/forfeited | $ / shares 29.10
Weighted Average Exercise Prices, Ending Balance | $ / shares 28.69
Weighted Average Exercise Prices, Vested | $ / shares 30.18
Weighted Average Exercise Prices, Unvested | $ / shares 27.23
Weighted Average Exercise Prices, Exercisable | $ / shares $ 30.18
Weighted average remaining contractual term, Outstanding 7 years 6 months
Weighted average remaining contractual term, Vested 6 years 6 months
Weighted average remaining contractual term, Unvested 8 years 6 months
Weighted average remaining contractual term, Exercisable 6 years 6 months
Aggregate Intrinsic Value, Outstanding | $ $ 247,336
Aggregate Intrinsic Value, Vested | $ 109,605
Aggregate Intrinsic Value, Unvested | $ 137,731
Aggregate Intrinsic Value, Exercisable | $ $ 109,605