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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | $ 502,181 | [1],[2] | $ 498,231
Accumulated Amortization | (387,578) | [1] | (367,531)
Foreign Currency Translation Adjustment | (5,109) |  | (5,218)
Net Carrying Amount | 109,494 |  | 125,482
Developed technology |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 337,198 | [1],[2] | 336,308
Accumulated Amortization | (265,951) | [1] | (252,080)
Foreign Currency Translation Adjustment | (4,035) |  | (4,079)
Net Carrying Amount | 67,212 |  | 80,149
Customer Relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 100,313 | [1],[2] | 97,153
Accumulated Amortization | (87,496) | [1] | (83,448)
Foreign Currency Translation Adjustment | (285) |  | (340)
Net Carrying Amount | 12,532 |  | 13,365
Trademarks and tradenames |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount | 64,670 | [1],[2] | 64,420
Accumulated Amortization | (34,131) | [1] | (31,653)
Foreign Currency Translation Adjustment | (789) |  | (799)
Net Carrying Amount | $ 29,750 |  | 31,968
Non-compete Agreements |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount |  |  | 320
Accumulated Amortization |  |  | (320)
Backlog |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Carrying Amount |  |  | 30
Accumulated Amortization |  |  | $ (30)
[1] | $0.7 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
[2] | Includes $4.6 million of intangible assets from Lemsys acquisition.

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