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Segment reporting - Summary of Assets by Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Total assets	$ 18,942,372	$ 18,948,193
U.S. dialysis and related lab services
ASSETS
Total assets	11,798,202	11,776,042
Other—Ancillary services and strategic initiatives
ASSETS
Total assets	1,419,905	1,410,509
DMG held for sale
ASSETS
Total assets	$ 5,724,265	$ 5,761,642

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- References

No definition available.

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- Details

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- Details

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