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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)

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