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Noncontrolling Interests Subject to Put Provisions and Other Commitments - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Schedule of Joint ventures to dissolve	Certain consolidated joint ventures are originally contractually scheduled to dissolve after terms ranging from ten to fifty years.
Minimum
Commitments And Contingencies Disclosure [Line Items]
Scheduled dissolution term of joint ventures	10 years
Maximum
Commitments And Contingencies Disclosure [Line Items]
Scheduled dissolution term of joint ventures	50 years
Commitments to provide operating capital
Commitments And Contingencies Disclosure [Line Items]
Other potential commitments to provide operating capital to several dialysis centers	$ 3,700

X

- Definition

Commitments and contingencies disclosure.

+ References

No definition available.

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- Definition

Dissolution term of joint ventures.

+ References

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X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

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X

- Definition

Describes the nature of an unconditional purchase obligation that is not recognized as a liability on the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308

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