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Summary of Assets by Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
ASSETS    
Total assets $ 18,514,875 $ 17,617,432
U.S. dialysis and related lab services    
ASSETS    
Total assets 11,591,507 10,633,813
HealthCare Partners (HCP)    
ASSETS    
Total assets 6,150,666 6,285,984
Other-Ancillary services and strategic initiatives    
ASSETS    
Total assets [1] $ 772,702 $ 697,635
[1] Includes approximately $69,519 and $ 44,146 in 2015 and 2014, respectively, of net property and equipment related to the Company’s international operations.