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Segment reporting - Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Expenditures for property and equipment $ 144,913 $ 154,942
U.S. dialysis    
Segment Reporting Information [Line Items]    
Expenditures for property and equipment 133,804 148,763
Other—Ancillary services    
Segment Reporting Information [Line Items]    
Expenditures for property and equipment $ 11,109 $ 6,179