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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) Person in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Entity Location Person Segment Country	Dec. 31, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Operating Segments | Segment	2
Number of countries in which dialysis centers located | Country	10
Percentage of voting rights	100.00%
Ownership in joint venture	50.00%
Funds on deposit with third parties	$ 82,679	$ 81,276
Number of legal entities that third parties held noncontrolling ownership | Entity	440
Interest rate cap agreements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Interest rate agreements, notional amount	$ 7,000,000
Debt instrument, description of variable rate basis	LIBOR
Derivative, effective date	Jun. 29, 2018
Interest Rate Cap Agreements Effective September 30, 2016
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Interest rate agreements, notional amount	$ 3,500,000
Derivative, effective date	Sep. 30, 2016
Term Loan B | Interest rate cap agreements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Interest rate agreements, notional amount	$ 2,735,000
California Medical Group Insurance
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Equity interest owned	67.00%
Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of management fees included in net operating revenues	1.00%
Maximum | Term Loan B | Interest rate cap agreements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt instrument, variable interest rate	3.50%
Maximum | Customer relationships
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	20 years
Maximum | Trade names
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	15 years
Maximum | Provider network and practice management tools
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	15 years
Maximum | Noncompetition and other agreements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	10 years
Maximum | Buildings
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Useful lives of the assets	40 years
Maximum | Equipment and Information Systems
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Useful lives of the assets	8 years
Minimum | Customer relationships
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	10 years
Minimum | Trade names
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	2 years
Minimum | Provider network and practice management tools
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	2 years
Minimum | Noncompetition and other agreements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Amortization period	2 years
Minimum | Buildings
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Useful lives of the assets	20 years
Minimum | Equipment and Information Systems
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Useful lives of the assets	3 years
Dialysis And Related Lab Services | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of risk on revenue	1.00%
UNITED STATES
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of dialysis centers that the company operated or provided administrative services | Entity	2,251
Number of states that dialysis centers located | Location	46
Number of patients served | Person	180
Outside United States
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of dialysis centers that the company operated or provided administrative services | Entity	118
Number of patients served | Person	10

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Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter.

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