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Aggregate Net Purchase Price Allocation to Assets and Liabilities based on Estimated Fair Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 3,882,715 | $ 3,869,760 | $ 3,844,628
2018 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Working capital, net |  |  | (3,988)
Property & equipment |  |  | 59,520
Goodwill |  |  | 45,090
Other assets |  |  | 8,409
Income tax assets, net of deferred tax liabilities |  |  | 1,749
Other |  |  | (316)
Cash paid for acquisitions |  |  | $ 110,464

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