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Acquisitions and Joint Venture Activities - Additional Information (Details)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2018
USD ($)
shares
Jun. 30, 2019
USD ($)
Agency
subsidiary
Jun. 30, 2019
USD ($)
Agency
agency_sold
Jun. 30, 2018
USD ($)
Business Acquisition [Line Items]        
Preliminary merger consideration $ 795,400      
Payments to noncontrolling interests     $ 18,748 $ 55
Number of agencies sold | agency_sold     2  
Proceeds from sale of interest     $ 3,500  
Equity joint ventures        
Business Acquisition [Line Items]        
Number of subsidiaries | subsidiary   3    
Payments to noncontrolling interests   $ 18,700    
Almost Family        
Business Acquisition [Line Items]        
Exchange ratio 91.50%      
Shares of the company issued (in shares) | shares 12.8      
Home Health Agencies | Home health services        
Business Acquisition [Line Items]        
Number of agencies | Agency   10 10  
Hospice Agencies | Home health services        
Business Acquisition [Line Items]        
Number of agencies | Agency   5 5  
Home health agencies and hospice agency        
Business Acquisition [Line Items]        
Preliminary merger consideration     $ 23,500  
Cash paid to for acquisitions     $ 20,431  
Customer relationships | Almost Family        
Business Acquisition [Line Items]        
Amortization period 20 years