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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Feb. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Accumulated Amortization | $ 290,880 |  | $ 290,880 | $ 244,025
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Accumulated Amortization | 79,028 |  | 79,028 | 63,788
Patents, Trademarks, Trade Names and Other [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Accumulated Amortization | 44,036 |  | 44,036 | $ 42,954
Electro Scientific Industries Inc [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets, purchase price |  | $ 316,200 |  |
Accumulated Amortization | 316,200 |  | 316,200 |
Finite lived intangible asset , gross favorable lease | 6,428 |  | 6,428 |
Electro Scientific Industries Inc [Member] | Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets, purchase price | 25,400 | $ 25,400 |  |
Electro Scientific Industries Inc [Member] | Patents, Trademarks, Trade Names and Other [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Accumulated Amortization | 3,445 |  | 3,445 |
Electro Scientific Industries Inc [Member] | Completed Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets, purchase price |  |  | $ 274,000 |
Electro Scientific Industries Inc [Member] | Trademarks Tradenames and Backlog [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets, purchase price | $ 16,800 |  |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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