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Segment reporting - Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Expenditures for property and equipment $ 143,258 $ 121,015
Segment, Expenditure, Addition to Long-Lived Assets 143,258 121,015
U S Dialysis And Related Lab Services [Member]    
Segment Reporting Information [Line Items]    
Segment, Expenditure, Addition to Long-Lived Assets 113,591 104,953
Other Operating Segment [Member]    
Segment Reporting Information [Line Items]    
Segment, Expenditure, Addition to Long-Lived Assets $ 29,667 $ 16,062