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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 877,870	$ 565,698
Impairment Charges	(1,511)	(1,511)
Accumulated Amortization	(256,328)	(244,025)
Foreign Currency Translation	(940)	(355)
Intangible assets, net	619,091	319,807
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	448,831	172,431
Impairment Charges	(105)	(105)
Accumulated Amortization	(146,614)	(137,283)
Foreign Currency Translation	(162)	(73)
Intangible assets, net	301,950	34,970
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	308,144	282,744
Impairment Charges	(1,406)	(1,406)
Accumulated Amortization	(68,738)	(63,788)
Foreign Currency Translation	(819)	(269)
Intangible assets, net	237,181	217,281
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	120,895	110,523
Accumulated Amortization	(40,976)	(42,954)
Foreign Currency Translation	41	(13)
Intangible assets, net	$ 79,960	$ 67,556

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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
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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/2009/role/commonPracticeRef
-Publisher FASB
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