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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |  |  |
Purchases of common stock (in shares) | 0 | 0 | (72) | 0
Stock option exercises (in shares) | 203 | 372 | 297 | 722
Employee stock plan purchases (in shares) | 13 | 11 | 28 | 23
Restricted stock units vested, net of withheld shares upon award settlement (in shares) | 27 | 0 | 37 | 0
Purchases of treasury shares | $ 0 | $ 0 | $ (14,289) | $ 0
Stock option exercises | 15,604 | 25,019 | 22,132 | 44,317
Employee stock plan purchases | 2,260 | 1,962 | 4,609 | 3,760
Restricted stock units vested, net of withheld shares upon award settlement | $ (2,008) | $ 0 | $ (3,381) | $ 0

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