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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Equity [Abstract] |  |
Purchases of treasury shares | $ (15,482) | $ (14,289)
Purchases of treasury (in shares) | (59) | (72)
Stock option exercises | $ 46,236 | $ 6,564
Stock option exercises (in shares) | 481 | 94
Employee stock plan purchases | $ 2,469 | $ 2,349
Employee stock plan purchases (in shares) | 10 | 15
Restricted stock units vested, net of withheld shares upon award settlement | $ (2,301) | $ (1,373)
Restricted stock units vested, net of withheld shares upon award settlement (in shares) | 10 | 10

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