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Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | May 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 9,889,791 |  | $ 9,407,317 | $ 9,294,479
Renal Ventures |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets |  | $ 24,529 |  |
Property and equipment |  | 36,295 |  |
Amortizable intangible and other long-term assets |  | 11,547 |  |
Goodwill |  | 296,582 |  |
Current liabilities |  | (6,912) |  |
Long-term liabilities |  | (478) |  |
Aggregate purchase price |  | $ 361,563 |  |
Dialysis and other businesses |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets | 7,439 |  |  |
Property and equipment | 13,278 |  |  |
Amortizable intangible and other long-term assets | 14,180 |  |  |
Non-amortizable intangibles | 4,833 |  |  |
Goodwill | 276,182 |  |  |
Current liabilities | (6,467) |  |  |
Long-term liabilities | (2,484) |  |  |
Noncontrolling interests | (36,075) |  |  |
Aggregate purchase price | $ 270,886 |  |  |

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