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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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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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Changes in Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Jun. 30, 2017
Goodwill [Roll Forward]
Beginning balance			$ 9,407,317	$ 9,294,479	$ 9,294,479
Acquisitions			572,764		447,828
Divestitures			(32,343)		(44,759)
Goodwill impairment charges	$ (61,117)	$ (176,000)	(85,315)	(253,000)	(281,415)
Foreign currency and other adjustments			27,368		(8,816)
Ending balance	9,889,791		9,889,791		9,407,317
Goodwill						$ 10,451,199
Accumulated impairment charges						(561,408)
Goodwill, net	9,889,791		9,407,317	9,294,479	9,294,479	9,889,791
U.S. dialysis and related lab services
Goodwill [Roll Forward]
Beginning balance			5,691,587	5,629,183	5,629,183
Acquisitions			427,299		75,295
Divestitures			(32,260)		(12,891)
Ending balance	6,086,626		6,086,626		5,691,587
Goodwill						6,086,626
Accumulated impairment charges						0
Goodwill, net	6,086,626		5,691,587	5,629,183	5,629,183	6,086,626
DMG
Goodwill [Roll Forward]
Beginning balance			3,391,942	3,398,264	3,398,264
Acquisitions			31,796		248,901
Divestitures			(29)		(2,223)
Goodwill impairment charges			(50,619)		(253,000)
Ending balance	3,373,090		3,373,090		3,391,942
Goodwill						3,865,478
Accumulated impairment charges						(492,388)
Goodwill, net	3,373,090		3,391,942	3,398,264	3,398,264	3,373,090
Ancillary services and strategic initiatives
Goodwill [Roll Forward]
Beginning balance			323,788	267,032	267,032
Acquisitions			113,669		123,632
Divestitures			(54)		(29,645)
Goodwill impairment charges			(34,696)		(28,415)
Foreign currency and other adjustments			27,368		(8,816)
Ending balance	430,075		430,075		323,788
Goodwill						499,095
Accumulated impairment charges						(69,020)
Goodwill, net	$ 430,075		$ 323,788	$ 267,032	$ 267,032	$ 430,075