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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