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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | [1] | $ 503,731 | $ 498,231
Accumulated Amortization |  | (378,164) | (367,531)
Foreign Currency Translation Adjustment |  | (6,195) | (5,218)
Net Carrying Amount |  | 119,372 | 125,482
Developed technology |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | [1] | 337,218 | 336,308
Accumulated Amortization |  | (259,129) | (252,080)
Foreign Currency Translation Adjustment |  | (4,812) | (4,079)
Net Carrying Amount |  | 73,277 | 80,149
Customer Relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | [1] | 100,743 | 97,153
Accumulated Amortization |  | (85,469) | (83,448)
Foreign Currency Translation Adjustment |  | (408) | (340)
Net Carrying Amount |  | 14,866 | 13,365
Trademarks and tradenames |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | [1] | 64,670 | 64,420
Accumulated Amortization |  | (32,897) | (31,653)
Foreign Currency Translation Adjustment |  | (973) | (799)
Net Carrying Amount |  | 30,800 | 31,968
Non-compete Agreements |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | [1] | 320 | 320
Accumulated Amortization |  |  | (320)
Backlog |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | [1] | 780 | 30
Accumulated Amortization |  | (349) | $ (30)
Foreign Currency Translation Adjustment |  | (2) |
Net Carrying Amount |  | $ 429 |
[1] | Includes $5.5 million of intangible assets from Lemsys acquisition.

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