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Summary of Assets by Segment (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Equity investments $ 64,420 $ 73,368
U.S. Dialysis And Related Lab Services    
Segment Reporting Information [Line Items]    
Equity investments 34,688 29,801
HealthCare Partners (HCP)    
Segment Reporting Information [Line Items]    
Equity investments 9,796 22,714
Other Segments    
Segment Reporting Information [Line Items]    
Equity investments $ 19,936 $ 20,853