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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 408,906 | $ 507,836
Accumulated Amortization | (307,347) | (375,008)
Foreign Currency Translation Adjustment | (620) | (7,348)
Net Carrying Amount | 100,939 | 125,480
Developed technology |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 272,547 | 361,787
Accumulated Amortization | (210,479) | (279,000)
Foreign Currency Translation Adjustment | (1,610) | (5,709)
Net Carrying Amount | 60,458 | 77,078
Customer Relationships |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 66,239 | 75,669
Accumulated Amortization | (54,524) | (59,077)
Foreign Currency Translation Adjustment | 305 | (455)
Net Carrying Amount | 12,020 | 16,137
Trademarks and tradenames |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 70,120 | 70,120
Accumulated Amortization | (42,344) | (36,671)
Foreign Currency Translation Adjustment | 685 | (1,184)
Net Carrying Amount | $ 28,461 | 32,265
Backlog |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount |  | 260
Accumulated Amortization |  | $ (260)

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