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Goodwill and Intangible Assets - Intangible Assets - Finite Lived (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 91,408 | $ 86,825
Accumulated Amortization | 61,771 | 55,542
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 14,457 | 14,457
Accumulated Amortization | 13,008 | 10,686
Customer Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 73,199 | 68,943
Accumulated Amortization | 48,959 | 44,484
Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 6,578 | 5,294
Accumulated Amortization | 1,758 | 1,154
Foreign Currency Adjustments [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | (2,826) | (1,869)
Accumulated Amortization | $ (1,954) | $ (782)

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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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