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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |
Purchases of common stock, Shares | 0 | (42)
Stock option exercises, Shares | 722 | 534
Employee stock plan purchases, Shares | 23 | 27
Purchases of common stock, Amount | $ 0 | $ (6,171)
Stock option exercises, Amount | 44,317 | 23,360
Employee stock plan purchases, Amount | $ 3,760 | $ 3,427

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