Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance	$ 6,787,635	$ 6,841,960	$ 6,841,960
Acquisitions	26,770		90,226
Impairment charges	0	(41,037)	(124,892)
Foreign currency and other adjustments	(34,833)		(19,659)
Divestitures	(1,549)
Ending balance	6,778,023		6,787,635
Goodwill, before accumulated impairment charges	6,926,507
Accumulated impairment charges	(148,484)
Ending balance	6,778,023		6,787,635
U.S. dialysis and related lab services
Goodwill [Roll Forward]
Beginning balance	6,287,100	6,275,004	6,275,004
Acquisitions	2,839		18,089
Impairment charges			0
Foreign currency and other adjustments	0		(5,993)
Divestitures	(1,549)
Ending balance	6,288,390		6,287,100
Goodwill, before accumulated impairment charges	6,288,390
Accumulated impairment charges	0
Ending balance	6,288,390		6,287,100
Other—Ancillary services and strategic initiatives
Goodwill [Roll Forward]
Beginning balance	500,535	$ 566,956	566,956
Acquisitions	23,931		72,137
Impairment charges			(124,892)
Foreign currency and other adjustments	(34,833)		(13,666)
Divestitures	0
Ending balance	489,633		500,535
Goodwill, before accumulated impairment charges	638,117
Accumulated impairment charges	(148,484)
Ending balance	$ 489,633		$ 500,535

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 of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture 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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