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Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 9,452,470 $ 9,407,317 $ 9,294,479
Dialysis businesses and other businesses      
Business Acquisition [Line Items]      
Current assets 1,123    
Property and equipment 5,604    
Amortizable intangible and other long-term assets 6,173    
Goodwill 78,729    
Noncontrolling interests assumed (8,052)    
Deferred income taxes (2,194)    
Liabilities assumed (447)    
Aggregate purchase price $ 80,936