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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity [Abstract] |  |  |  |
Purchases of treasury (in shares) | 0 | 0 | (72) | 0
Stock option exercises (in shares) | 395 | 326 | 691 | 1,048
Employee stock plan purchases (in shares) | 15 | 12 | 43 | 35
Restricted stock units vested, net of withheld shares upon award settlement (in shares) | 1 | 0 | 38 | 0
Purchases of treasury shares | $ 0 | $ 0 | $ (14,289) | $ 0
Stock option exercises | 40,163 | 26,219 | 62,295 | 70,536
Employee stock plan purchases | 2,718 | 2,218 | 7,327 | 5,978
Restricted stock units vested, net of withheld shares upon award settlement | $ (191) | $ 0 | $ (3,572) | $ 0

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