Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance	$ 7,076,610	$ 7,046,241
Acquisitions	690	49,047
Divestitures		(3,350)
Foreign currency and other adjustments	28,942	(15,328)
Ending balance	7,106,242	7,076,610
Goodwill, before accumulated impairment charges	7,227,457
Accumulated impairment charges	(121,215)
Ending balance	7,106,242	7,076,610
U.S. dialysis
Goodwill [Roll Forward]
Beginning balance	6,416,825	6,400,162
Acquisitions	0	16,750
Divestitures		(87)
Foreign currency and other adjustments	0	0
Ending balance	6,416,825	6,416,825
Goodwill, before accumulated impairment charges	6,416,825
Accumulated impairment charges	0
Ending balance	6,416,825	6,416,825
Other—Ancillary services
Goodwill [Roll Forward]
Beginning balance	659,785	646,079
Acquisitions	690	32,297
Divestitures		(3,263)
Foreign currency and other adjustments	28,942	(15,328)
Ending balance	689,417	659,785
Goodwill, before accumulated impairment charges	810,632
Accumulated impairment charges	(121,215)
Ending balance	$ 689,417	$ 659,785

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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