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Summary of Assets by Segment (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Property and equipment, net $ 2,788,740 $ 2,469,099
Equity investments 73,368 65,637
Other-Ancillary services and strategic initiatives    
Segment Reporting Information [Line Items]    
Equity investments 20,853 22,106
U.S. dialysis and related lab services    
Segment Reporting Information [Line Items]    
Equity investments 29,801 28,138
HealthCare Partners (HCP)    
Segment Reporting Information [Line Items]    
Equity investments 22,714 15,393
Outside United States | Other-Ancillary services and strategic initiatives    
Segment Reporting Information [Line Items]    
Property and equipment, net $ 69,519 $ 44,146