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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |
Stock option exercises, Shares | 1,126 | 1,113 | 827
Purchases of common stock, Shares | (781) | (44) | (882)
Employee stock plan purchases, Shares | 45 | 51 | 47
Stock option exercises | $ 74,907 | $ 49,845 | $ 23,527
Purchases of common stock, Amount | (150,050) | (6,613) | (112,699)
Employee stock plan purchases, Amount | $ 8,051 | $ 7,044 | $ 6,236

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