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Summary of Assets by Segment (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Feb. 25, 2017 | Dec. 31, 2016
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ASSETS |  |  |
Total assets | $ 19,341,784 |  | $ 18,741,257
U.S. dialysis and related lab services |  |  |
ASSETS |  |  |
Total assets | 11,500,974 | $ 338,963 | 11,099,137
DMG |  |  |
ASSETS |  |  |
Total assets | 6,282,819 |  | 6,213,091
Ancillary services and strategic initiatives |  |  |
ASSETS |  |  |
Total assets | $ 1,557,991 |  | $ 1,429,029

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