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Goodwill and Other Intangible Assets - Summary of Carrying Values of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 152,266 | $ 151,937
Accumulated Amortization | 68,880 | 54,574
Total | 83,386 | 97,363
Customer Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 109,977 | 109,825
Accumulated Amortization | 46,699 | 40,169
Total | 63,278 | 69,656
Technology [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,815 | 16,661
Accumulated Amortization | 9,326 | 7,051
Total | 7,489 | 9,610
Backlog [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,000 | 13,000
Accumulated Amortization | 11,375 | 6,500
Total | 1,625 | 6,500
Trademarks [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,474 | 12,451
Accumulated Amortization | 1,480 | 854
Total | $ 10,994 | $ 11,597

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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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