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Aggregate Net Purchase Price Allocation to Assets and Liabilities based on Estimated Fair Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 3,844,628 | $ 3,825,157 | $ 3,784,106
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 |  |
2016 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Working capital, net |  |  | 6,680
Property & equipment |  |  | 343,846
Goodwill |  |  | 234,658
Other assets |  |  | 19,910
Income tax assets, net of deferred tax liabilities |  |  | 11,551
Debt |  |  | (152)
Noncontrolling interest |  |  | (2,690)
Cash paid for acquisitions |  |  | $ 613,803

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