Earnings Per Share - Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income	$ 59,384	$ 47,697	$ 22,642	$ 41,247	$ 25,111	$ 24,057	$ 129,723	$ 90,415
Denominator:
Weighted-average shares outstanding—basic	478,101			465,819			475,496	460,747
Effect of dilutive securities:
Options to purchase common stock	17,623			22,230			18,772	22,819
Employee stock purchase plan shares	278			454			533	815
Restricted stock	2,910			3,704			3,141	2,928
Weighted-average shares outstanding—diluted	498,912			492,207			497,942	487,309
Basic EPS	$ 0.12			$ 0.09			$ 0.27	$ 0.20
Diluted EPS	$ 0.12			$ 0.08			$ 0.26	$ 0.19
Anti-dilutive equity awards under stock-based award plans excluded from the determination of diluted EPS	1,439			1,880			1,439	1,880

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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