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Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Acquisition Date [Line Items] |  |  |  |
Total net revenues | $ 474,110 | $ 683,764 | $ 952,179 | $ 1,344,409
Net income | $ 47,464 | $ 132,601 | $ 89,871 | $ 230,765
Net income per share: |  |  |  |
Basic | $ 0.87 | $ 2.42 | $ 1.65 | $ 4.23
Diluted | $ 0.86 | $ 2.40 | $ 1.64 | $ 4.17

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