Segment Reporting - Summary of Assets by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Assets	$ 17,121,488	$ 16,988,516
Equity method and other investments	238,881	257,491
Property and equipment, net of accumulated depreciation	3,479,972	3,521,824
U.S. dialysis
ASSETS
Assets	15,375,000	15,344,647
Equity method and other investments	112,500	122,974
Other - Ancillary services
ASSETS
Assets	1,746,488	1,643,869
Equity method and other investments	126,381	134,517
International | Other - Ancillary services
ASSETS
Property and equipment, net of accumulated depreciation	$ 190,029	$ 181,137