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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | $ 565,698 | $ 565,698
Impairment Charges | (1,511) | (1,511)
Accumulated Amortization | (222,080) | (199,619)
Foreign Currency Translation | 577 | 1,830
Intangible assets, net | 342,684 | 366,398
Completed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 172,431 | 172,431
Impairment Charges | (105) | (105)
Accumulated Amortization | (126,383) | (115,371)
Foreign Currency Translation | 26 | 333
Intangible assets, net | 45,969 | 57,288
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 282,744 | 282,744
Impairment Charges | (1,406) | (1,406)
Accumulated Amortization | (54,712) | (45,518)
Foreign Currency Translation | 550 | 1,571
Intangible assets, net | 227,176 | 237,391
Patents, Trademarks, Trade Names and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 110,523 | 110,523
Accumulated Amortization | (40,985) | (38,730)
Foreign Currency Translation | 1 | (74)
Intangible assets, net | $ 69,539 | $ 71,719

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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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