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Acquisitions and divestitures - Additional Information (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 USD ($) clinic | Jun. 30, 2021 USD ($)
Business Acquisition [Line Items] |  |
Cash paid to acquire businesses | $ 9,491 | $ 23,890
Business Acquisition, Goodwill, Adjustment To Expected Tax Deductible Amount | (1,145) |
Other current liabilities |  |
Business Acquisition [Line Items] |  |
Contingent earn-out obligations | 10,047 |
Other long-term liabilities |  |
Business Acquisition [Line Items] |  |
Contingent earn-out obligations | 19,252 |
Other companies |  |
Business Acquisition [Line Items] |  |
Contingent earn-out obligations | $ 29,299 |
Minimum | Other companies | EBITDA or Operating Income Performance Targets or Quality Margins |  |
Business Acquisition [Line Items] |  |
Earn-out consideration payment period | 1 year |
Maximum |  |
Business Acquisition [Line Items] |  |
Contingent earn-out obligations and liabilities assumed associated with acquisitions | $ 64,846 |
Maximum | Other companies | EBITDA or Operating Income Performance Targets or Quality Margins |  |
Business Acquisition [Line Items] |  |
Earn-out consideration payment period | 5 years |
Dialysis and other businesses |  |
Business Acquisition [Line Items] |  |
Cash paid to acquire businesses | $ 9,491 |
Contingent earn-out obligations and liabilities assumed associated with acquisitions | 523 |
Deferred purchase price obligations | $ 5,784 |
Foreign Dialysis Centers | Dialysis and other businesses |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | clinic | 5 |

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