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Aggregate Net Purchase Price Allocation to Assets and Liabilities based on Estimated Fair Values (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Goodwill | $ 3,596,114 | $ 3,291,213 | $ 3,049,016
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 |  |
2014 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Working capital, net |  | (41,000) |
Property & equipment |  | 174,000 |
Goodwill |  | 250,000 |
Other assets |  | 59,000 |
Income tax assets, net of deferred tax liabilities |  | 4,000 |
Debt |  | (16,000) |
Other |  | 1,000 |
Cash paid for acquisitions |  | $ 431,000 |

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