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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |
Stock option exercises, Shares | 999 | 1,126 | 1,113
Purchases of common stock, Shares | (72) | (781) | (44)
Employee stock plan purchases, Shares | 53 | 45 | 51
Restricted stock units vested, net of withheld shares upon award settlement, Shares | 53 | 0 | 0
Issuance of shares pursuant to stock compensation plan | $ 96,908 | $ 74,907 | $ 49,845
Purchases of common stock | (14,289) | (150,050) | (6,613)
Employee stock plan purchases | 9,576 | 8,051 | 7,044
Restricted stock units vested, net of withheld shares upon award settlement | $ (5,361) | $ 0 | $ 0

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