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Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Beginning balance	$ 7,375,216	$ 7,112,560
Acquisitions	669	349,069
Divestitures		(3,193)
Foreign currency and other adjustments	89,884	(83,220)
Ending balance	7,465,769	7,375,216
Goodwill, before accumulated impairment charges	7,622,351
Accumulated impairment charges	(156,582)
Ending balance	7,465,769	7,375,216
U. S. Dialysis
Goodwill [Roll Forward]
Beginning balance	6,517,220	6,416,825
Acquisitions	5,384	102,082
Divestitures		(1,687)
Foreign currency and other adjustments	0	0
Ending balance	6,522,604	6,517,220
Goodwill, before accumulated impairment charges	6,522,604
Accumulated impairment charges	0
Ending balance	6,522,604	6,517,220
Other - Ancillary Services
Goodwill [Roll Forward]
Beginning balance	857,996	695,735
Acquisitions	(4,715)	246,987
Divestitures		(1,506)
Foreign currency and other adjustments	89,884	(83,220)
Ending balance	943,165	857,996
Goodwill, before accumulated impairment charges	1,099,747
Accumulated impairment charges	(156,582)
Ending balance	$ 943,165	$ 857,996

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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