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Summary of Assets by Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Total assets	$ 18,514,198	$ 18,514,875
U.S. Dialysis And Related Lab Services
ASSETS
Total assets	11,049,206	11,591,507
HealthCare Partners (HCP)
ASSETS
Total assets	6,601,110	6,150,666
Other Segments
ASSETS
Total assets	$ 863,882	$ 772,702

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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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
-Article 7

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- References

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