Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 7,112,560	$ 7,076,610	$ 7,076,610
Acquisitions	139,606		25,723
Divestitures	(3,193)
Goodwill impairment charges	0	0	(26,083)
Foreign currency and other adjustments	(21,343)		36,310
Ending balance	7,227,630		7,112,560
Goodwill, before accumulated impairment charges	7,377,889
Accumulated impairment charges	(150,259)
Ending balance	7,227,630		7,112,560
U.S. dialysis
Goodwill [Roll Forward]
Beginning balance	6,416,825	6,416,825	6,416,825
Acquisitions	102,082		0
Divestitures	(1,687)
Goodwill impairment charges			0
Foreign currency and other adjustments	0		0
Ending balance	6,517,220		6,416,825
Goodwill, before accumulated impairment charges	6,517,220
Accumulated impairment charges	0
Ending balance	6,517,220		6,416,825
Other—Ancillary services
Goodwill [Roll Forward]
Beginning balance	695,735	$ 659,785	659,785
Acquisitions	37,524		25,723
Divestitures	(1,506)
Goodwill impairment charges			(26,083)
Foreign currency and other adjustments	(21,343)		36,310
Ending balance	710,410		695,735
Goodwill, before accumulated impairment charges	860,669
Accumulated impairment charges	(150,259)
Ending balance	$ 710,410		$ 695,735

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