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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

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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. + References No definition available. + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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