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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Entity Location Person Segment Country | Dec. 31, 2015 USD ($)
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 | 11 |
Funds on deposit with third parties | $ | $ 75,877 | $ 82,679
Number of legal entities that third parties held noncontrolling equity interests | 490 |
California Medical Group Insurance |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |
Equity interest owned | 67.00% |
Trade names |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |
Amortization period | 4 years |
Maximum |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |
Percentage of management fees included in net operating revenues | 1.00% |
Maximum | Customer relationships |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |
Amortization period | 20 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 | 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 | 2,350 |
Number of states that dialysis centers located | Location | 46 |
Number of patients served | Person | 187,700 |
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 | 154 |
Number of patients served | Person | 15,100 |

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