Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Acquired goodwill		$ 474.0
Goodwill impairment charges related to pending closure of facility in Europe	$ 1.1
Electro Scientific Industries Inc [Member]
Goodwill [Line Items]
Acquired goodwill		$ 474.0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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