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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 498,231 | $ 414,038
Accumulated Amortization | (367,531) | (337,155)
Foreign Currency Translation Adjustment | (5,218) | 2,205
Net Carrying Amount | 125,482 | 79,088
Developed technology |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 336,308 | 270,877
Accumulated Amortization | (252,080) | (226,190)
Foreign Currency Translation Adjustment | (4,079) | 1,618
Net Carrying Amount | 80,149 | 46,305
Customer Relationships |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 97,153 | 92,741
Accumulated Amortization | (83,448) | (83,585)
Foreign Currency Translation Adjustment | (340) | 171
Net Carrying Amount | 13,365 | 9,327
Trademarks and tradenames |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 64,420 | 50,100
Accumulated Amortization | (31,653) | (27,120)
Foreign Currency Translation Adjustment | (799) | 416
Net Carrying Amount | 31,968 | 23,396
Non-compete Agreements |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 320 | 320
Accumulated Amortization | (320) | (260)
Net Carrying Amount |  | $ 60
Backlog [Member] |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 30 |
Accumulated Amortization | $ (30) |

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