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Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 9,382,996 | $ 9,294,479 | $ 9,415,295
Dialysis businesses and other businesses |  |  |
Business Acquisition [Line Items] |  |  |
Current assets | 1,762 |  |
Property and equipment | 3,725 |  |
Amortizable intangible and other long-term assets | 5,777 |  |
Goodwill | 127,307 |  |
Deferred income taxes | 597 |  |
Noncontrolling interests assumed | (19,176) |  |
Liabilities assumed | (951) |  |
Aggregate purchase price | $ 119,041 |  |

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