Description of risks that arise due to the volume of business transacted with a three health plans. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

No definition available.

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- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

+ 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 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph a, b

-Article 5

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Concentrations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Concentration risk, customer	There is no single payor that accounted for more than 10% of total consolidated accounts receivable at December 31, 2014 and 2013.
Accounts Receivable \| Government-based Programs, Medicare and Medicaid
Concentration Risk [Line Items]
Concentration Risk, Percentage	80.00%
Accounts Receivable \| Product Concentration Risk \| Minimum
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
U.S. dialysis and related lab services \| Sales Revenue, Services, Net \| Government-based Programs, Medicare and Medicaid
Concentration Risk [Line Items]
Concentration Risk, Percentage	67.00%	66.00%	66.00%
Accounts receivable, and other receivables, from Medicare and Medicaid-assigned plans	$ 705,532	$ 679,006
U.S. dialysis and related lab services \| Sales Revenue, Services, Net \| Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	2.00%	2.00%
HealthCare Partners (HCP)
Concentration Risk [Line Items]
Number of health plans	3
HealthCare Partners (HCP) \| Sales Revenue, Services, Net \| Government-based Programs, Medicare and Medicaid
Concentration Risk [Line Items]
Concentration Risk, Percentage	71.00%	69.00%
HealthCare Partners (HCP) \| Sales Revenue, Services, Net \| Product Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	64.00%	67.00%
HealthCare Partners (HCP) \| Accounts Receivable \| Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage	73.00%	69.00%