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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

X

- Definition

Unfavorable leasehold liability.

+ References

No definition available.

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- Definition

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+ References

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

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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

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