Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 7,112,560	$ 7,076,610	$ 7,076,610
Acquisitions	137,817		25,723
Divestitures	(1,687)
Goodwill impairment charges	0	0	(26,083)
Foreign currency and other adjustments	(47,291)		36,310
Ending balance	7,201,399		7,112,560
Goodwill, before accumulated impairment charges	7,346,904
Accumulated impairment charges	(145,505)
Ending balance	7,201,399		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	35,735		25,723
Divestitures	0
Goodwill impairment charges			(26,083)
Foreign currency and other adjustments	(47,291)		36,310
Ending balance	684,179		695,735
Goodwill, before accumulated impairment charges	829,684
Accumulated impairment charges	(145,505)
Ending balance	$ 684,179		$ 695,735

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