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Segment reporting - Summary of Assets by Segment (Phantom) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Equity method and other investments	$ 249,020	$ 245,534
U.S. dialysis and related lab services
Segment Reporting Information [Line Items]
Equity method and other investments	93,282	84,866
Other—Ancillary services and strategic initiatives
Segment Reporting Information [Line Items]
Equity method and other investments	155,738	160,668
DMG held for sale
Segment Reporting Information [Line Items]
Equity method and other investments	$ 5,099	$ 10,321

X

- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

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+ References

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