Summary of Assets by Segment (Parenthetical) (Detail) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Equity investments | $ 516,383 | $ 78,368 |
| U.S. Dialysis And Related Lab Services | ||
| Segment Reporting Information [Line Items] | ||
| Equity investments | 41,624 | 34,801 |
| DaVita Medical Group (DMG) | ||
| Segment Reporting Information [Line Items] | ||
| Equity investments | 11,293 | 22,714 |
| Other Segments | ||
| Segment Reporting Information [Line Items] | ||
| Equity investments | $ 463,466 | $ 20,853 |