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Segment reporting - Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]    
Expenditures for property and equipment $ 384,786 $ 409,011
Segment, Expenditure, Addition to Long-Lived Assets 384,786 409,011
U.S. dialysis    
Segment Reporting Information [Line Items]    
Segment, Expenditure, Addition to Long-Lived Assets 331,031 363,895
Other—Ancillary services    
Segment Reporting Information [Line Items]    
Segment, Expenditure, Addition to Long-Lived Assets $ 53,755 $ 45,116