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Aggregate Net Purchase Price Allocation to Assets and Liabilities based on Estimated Fair Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 3,825,157 | $ 3,784,106 | $ 3,596,114
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 |
2015 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Working capital, net |  |  | (7,000)
Property & equipment |  |  | 116,000
Goodwill |  |  | 319,000
Other assets |  |  | 128,000
Income tax assets, net of deferred tax liabilities |  |  | (22,000)
Cash paid for acquisitions |  |  | $ 534,000

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