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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 29, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 45,743	$ 35,681	$ 6,764
Acquired intangible assets	$ 404,506
Completed Technology [Member] | Data Analytics Solutions Business [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		4,155
Customer Relationships [Member] | Data Analytics Solutions Business [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		2,300
Patents, Trademarks, Trade Names and Other [Member] | Data Analytics Solutions Business [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 1,200
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

Unfavorable leasehold liability.

+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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

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