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Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 414,038 | $ 414,038
Accumulated Amortization | (337,155) | (306,698)
Foreign Currency Translation Adjustment | 2,205 | (6,939)
Net Carrying Amount | 79,088 | 100,401
Developed technology |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 270,877 | 270,877
Accumulated Amortization | (226,190) | (206,376)
Foreign Currency Translation Adjustment | 1,618 | (5,093)
Net Carrying Amount | 46,305 | 59,408
Customer Relationships |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 92,741 | 92,741
Accumulated Amortization | (83,585) | (76,707)
Foreign Currency Translation Adjustment | 171 | (538)
Net Carrying Amount | 9,327 | 15,496
Trademarks and tradenames |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 50,100 | 50,100
Accumulated Amortization | (27,120) | (23,435)
Foreign Currency Translation Adjustment | 416 | (1,308)
Net Carrying Amount | 23,396 | 25,357
Non-compete Agreements |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 320 | 320
Accumulated Amortization | (260) | (180)
Net Carrying Amount | $ 60 | $ 140

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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