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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity [Abstract] |  |  |  |
Purchases of treasury shares | $ (2) | $ 0 | $ (15,484) | $ (14,289)
Purchases of treasury (in shares) | 0 | 0 | (59) | (72)
Stock option exercises | $ 8,395 | $ 40,163 | $ 100,732 | $ 62,295
Stock option exercises (in shares) | 72 | 395 | 989 | 691
Employee stock plan purchases | $ 3,032 | $ 2,718 | $ 8,209 | $ 7,327
Employee stock plan purchases (in shares) | 11 | 15 | 31 | 43
Restricted stock units vested, net of withheld shares upon award settlement | $ (316) | $ (191) | $ (7,208) | $ (3,572)
Restricted stock units vested, net of withheld shares upon award settlement (in shares) | 2 | 1 | 45 | 38

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