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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 29, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment Charges |  | $ (1,511) |
Acquired intangible assets | $ 404,506 |  |
Completed Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment Charges |  | (105) |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment Charges |  | $ (1,406) |
Newport [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets |  |  | $ 404,506
Unfavorable lease commitments |  |  | 4,302
Newport [Member] | Completed Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets |  |  | 75,386
Newport [Member] | Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets | $ 247,793 |  | 247,793
Newport [Member] | Patents, Trademarks, Trade Names and Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired intangible assets |  |  | $ 81,327

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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