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Acquisitions and divestitures - Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 6,790,606 | $ 6,787,635 | $ 6,841,960
Dialysis and other businesses |  |  |
Business Acquisition [Line Items] |  |  |
Current assets | 9,934 |  |
Property and equipment | 9,204 |  |
Intangible and other long-term assets | 7,138 |  |
Goodwill | 41,584 |  |
Deferred income taxes | 1,513 |  |
Current liabilities | (12,048) |  |
Noncontrolling interests | (596) |  |
Total assets acquired and liabilities assumed | $ 56,729 |  |

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