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Segment reporting - Summary of Assets by Segment (Phantom) (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Equity method and other investments | $ 219,386 | $ 224,611
U.S. dialysis and related lab services |  |
Segment Reporting Information [Line Items] |  |
Equity method and other investments | 100,815 | 95,290
Other—Ancillary services and strategic initiatives |  |
Segment Reporting Information [Line Items] |  |
Equity method and other investments | 118,571 | 129,321
DMG held for sale |  |
Segment Reporting Information [Line Items] |  |
Equity method and other investments | $ 0 | $ 4,833

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