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Acquisitions and divestitures - Additional Information (Detail)
$ in Thousands
6 Months Ended
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