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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 27, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 507,576	$ 507,836
Accumulated Amortization	(399,799)	(375,008)
Foreign Currency Translation Adjustment	(4,105)	(7,348)
Net Carrying Amount	103,672	125,480
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	361,787	361,787
Accumulated Amortization	(295,801)	(279,000)
Foreign Currency Translation Adjustment	(3,806)	(5,709)
Net Carrying Amount	62,180	77,078
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	75,669	75,669
Accumulated Amortization	(63,107)	(59,077)
Foreign Currency Translation Adjustment	(42)	(455)
Net Carrying Amount	12,520	16,137
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	70,120	70,120
Accumulated Amortization	(40,891)	(36,671)
Foreign Currency Translation Adjustment	(257)	(1,184)
Net Carrying Amount	$ 28,972	32,265
Backlog
Finite-Lived Intangible Assets
Gross Carrying Amount		260
Accumulated Amortization		$ (260)

X

- 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

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- Definition

Amount before 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 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after 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 926
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