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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | $ 1,648,149 | $ 1,638,944
Intangible assets, Accumulated Amortization | 980,128 | 896,758
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 1,421,962 | 1,412,954
Intangible assets, Accumulated Amortization | 838,443 | 767,532
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 162,365 | 162,183
Intangible assets, Accumulated Amortization | 100,000 | 92,258
Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 63,822 | 63,807
Intangible assets, Accumulated Amortization | $ 41,685 | $ 36,968

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