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Segment reporting - Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]    
Expenditures for property and equipment $ 265,461 $ 294,438
U.S. dialysis    
Segment Reporting Information [Line Items]    
Expenditures for property and equipment 237,686 271,884
Other—Ancillary services    
Segment Reporting Information [Line Items]    
Expenditures for property and equipment $ 27,775 $ 22,554