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Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ in Thousands |  |  | 9 Months Ended
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Sep. 30, 2019 | Feb. 01, 2019 | Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | $ 316,200 |
Completed Technology [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  |  | $ 274,000
Completed Technology [Member] | Lasers Products [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | $ 255,700 |
Estimated useful life of finite-lived intangible assets |  | 12 years |
Completed Technology [Member] | Non Laser Products [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | $ 18,300 |
Estimated useful life of finite-lived intangible assets |  | 10 years |
Trademarks and Trade Names [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | $ 14,400 |
Estimated useful life of finite-lived intangible assets |  | 7 years |
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price | $ 25,400 | $ 25,400 |
Estimated useful life of finite-lived intangible assets |  | 10 years |
Backlog [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets, purchase price |  | $ 2,400 |
Estimated useful life of finite-lived intangible assets |  | 1 year |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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