Segment Reporting - Summary of Expenditures for Property and Equipment by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Expenditures for property and equipment	$ 641,465	$ 674,541	$ 766,546
U.S. dialysis
Segment Reporting Information [Line Items]
Expenditures for property and equipment	589,662	646,870	681,339
Other - Ancillary services
Segment Reporting Information [Line Items]
Expenditures for property and equipment	51,803	27,671	46,741
DMG - discontinued operations
Segment Reporting Information [Line Items]
Expenditures for property and equipment	$ 0	$ 0	$ 38,466