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Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 94,964 | $ 91,408
Accumulated Amortization | 67,306 | 61,771
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 14,457 | 14,457
Accumulated Amortization | 13,532 | 13,008
Customer Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 73,199 | 73,199
Accumulated Amortization | 52,729 | 48,959
Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 9,728 | 6,578
Accumulated Amortization | 2,476 | 1,758
Foreign Currency Adjustments [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | (2,420) | (2,826)
Accumulated Amortization | $ (1,431) | $ (1,954)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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