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Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 9,382,996 $ 9,294,479 $ 9,415,295
Dialysis businesses and other businesses      
Business Acquisition [Line Items]      
Current assets 1,762    
Property and equipment 3,725    
Amortizable intangible and other long-term assets 5,777    
Goodwill 127,307    
Deferred income taxes 597    
Noncontrolling interests assumed (19,176)    
Liabilities assumed (951)    
Aggregate purchase price $ 119,041