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Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Beginning balance	$ 6,919,109	$ 6,787,635
Acquisitions	5,456	130,057
Divestitures		8,293
Foreign currency and other adjustments	(33,356)	9,710
Ending balance	6,891,209	6,919,109
Goodwill, before accumulated impairment charges	7,021,782
Accumulated impairment charges	(130,573)
Ending balance	6,891,209	6,919,109
U.S. dialysis
Goodwill [Roll Forward]
Beginning balance	6,309,928	6,287,100
Acquisitions	0	24,377
Divestitures		1,549
Foreign currency and other adjustments	0	0
Ending balance	6,309,928	6,309,928
Goodwill, before accumulated impairment charges	6,309,928
Accumulated impairment charges	0
Ending balance	6,309,928	6,309,928
Other—Ancillary services
Goodwill [Roll Forward]
Beginning balance	609,181	500,535
Acquisitions	5,456	105,680
Divestitures		6,744
Foreign currency and other adjustments	(33,356)	9,710
Ending balance	581,281	609,181
Goodwill, before accumulated impairment charges	711,854
Accumulated impairment charges	(130,573)
Ending balance	$ 581,281	$ 609,181

X

- Definition

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.

+ References

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-SubTopic 210
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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