XML 85 R72.htm IDEA: XBRL DOCUMENT v3.19.1
Acquisitions and divestitures - Aggregate Purchase Cost Allocations for Acquisitions (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 6,799,368 $ 6,841,960 $ 6,610,279
Dialysis and other businesses      
Business Acquisition [Line Items]      
Current assets 1,117    
Property and equipment 923    
Intangible and other long-term assets 4,312    
Goodwill 8,655    
Current liabilities (592)    
Long-term liabilities (88)    
Noncontrolling interests (1,762)    
Aggregate purchase price $ 12,565