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Segment reporting - Summary of Assets by Segment (Phantom) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Equity method and other investments	$ 545,053	$ 502,389
U.S. dialysis and related lab services
Segment Reporting Information [Line Items]
Equity method and other investments	87,549	66,924
DMG
Segment Reporting Information [Line Items]
Equity method and other investments	9,155	10,350
Ancillary services and strategic initiatives
Segment Reporting Information [Line Items]
Equity method and other investments	$ 448,349	$ 425,115

X

- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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