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Aggregate Net Purchase Price Allocation to Assets and Liabilities based on Estimated Fair Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 3,869,760 | $ 3,844,628 | $ 3,825,157
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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