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Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 9,485,628 $ 9,294,479 $ 9,415,295
Dialysis businesses and other businesses      
Business Acquisition [Line Items]      
Current assets 56    
Property and equipment 239    
Amortizable intangible and other long-term assets 740    
Goodwill 11,171    
Noncontrolling interests assumed (5,045)    
Aggregate purchase price $ 7,161