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Segment reporting - Summary of Assets by Segment (Phantom) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Equity method and other investments | $ 240,820 | $ 245,534
U.S. dialysis and related lab services |  |
Segment Reporting Information [Line Items] |  |
Equity method and other investments | 94,144 | 84,866
Other—Ancillary services and strategic initiatives |  |
Segment Reporting Information [Line Items] |  |
Equity method and other investments | 146,676 | 160,668
DMG held for sale |  |
Segment Reporting Information [Line Items] |  |
Equity method and other investments | $ 5,060 | $ 10,321

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