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Goodwill - Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance			$ 6,787,635	$ 6,841,960	$ 6,841,960
Acquisitions			41,584		90,226
Impairment charges	$ 0	$ 0	0	(41,037)	(124,892)
Foreign currency and other adjustments			(30,320)		(19,659)
Divestitures			(8,293)
Ending balance	6,790,606		6,790,606		6,787,635
Goodwill, before accumulated impairment charges	6,915,772		6,915,772
Accumulated impairment charges	(125,166)		(125,166)
Ending balance	6,790,606		6,790,606		6,787,635
U.S. dialysis
Goodwill [Roll Forward]
Beginning balance			6,287,100	6,275,004	6,275,004
Acquisitions			3,997		18,089
Impairment charges					0
Foreign currency and other adjustments			0		(5,993)
Divestitures			(1,549)
Ending balance	6,289,548		6,289,548		6,287,100
Goodwill, before accumulated impairment charges	6,289,548		6,289,548
Accumulated impairment charges	0		0
Ending balance	6,289,548		6,289,548		6,287,100
Other—Ancillary services
Goodwill [Roll Forward]
Beginning balance			500,535	$ 566,956	566,956
Acquisitions			37,587		72,137
Impairment charges					(124,892)
Foreign currency and other adjustments			(30,320)		(13,666)
Divestitures			(6,744)
Ending balance	501,058		501,058		500,535
Goodwill, before accumulated impairment charges	626,224		626,224
Accumulated impairment charges	(125,166)		(125,166)
Ending balance	$ 501,058		$ 501,058		$ 500,535

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.

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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 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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