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Acquisitions and Dispositions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Acquisition Date [Line Items]
Total net revenues	$ 478,069	$ 660,513
Net income	$ 49,135	$ 101,633
Net income per share:
Basic	$ 0.91	$ 1.87
Diluted	$ 0.90	$ 1.84

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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