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Acquisitions and Divestitures - Assets Acquired and Liabilities Assumed and Recognized at Acquisition Dates at Estimated Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
May 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 6,610,279   $ 6,015,375 $ 5,896,215
Series of individually immaterial business acquisitions        
Business Acquisition [Line Items]        
Current assets, net of cash acquired 14,366   3,996 2,647
Property and equipment 18,192   8,840 4,466
Amortizable intangible and other long-term assets 11,663   5,876 8,924
Goodwill 318,832   198,927 67,183
Long-term liabilities (15,846)   (3,317) (1,595)
Aggregate purchase price $ 334,990   $ 184,582 $ 62,003
Renal Ventures Limited, LLC        
Business Acquisition [Line Items]        
Current assets, net of cash acquired   $ 22,739    
Property and equipment   36,295    
Amortizable intangible and other long-term assets   11,547    
Goodwill   298,200    
Current liabilities   (8,389)    
Long-term liabilities   (479)    
Aggregate purchase price   $ 359,913