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Summary of Assets by Segment (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
ASSETS |  |
Total assets | $ 18,691,630 | $ 18,514,875
U.S. Dialysis And Related Lab Services |  |
ASSETS |  |
Total assets | 11,532,690 | 11,591,507
HealthCare Partners (HCP) |  |
ASSETS |  |
Total assets | 6,239,567 | 6,150,666
Other Segments |  |
ASSETS |  |
Total assets | $ 919,373 | $ 772,702

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