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Business Combinations - Textual (Details)
1 Months Ended 12 Months Ended
Jan. 01, 2022
USD ($)
Jun. 01, 2021
USD ($)
location
Jul. 31, 2019
USD ($)
location
bed
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2021
Jul. 31, 2021
bed
Jun. 30, 2021
bed
Apr. 30, 2021
bed
May 31, 2020
USD ($)
bed
Jan. 31, 2020
bed
Sep. 30, 2019
bed
Mar. 31, 2019
location
Business Acquisition [Line Items]                            
Gain on consolidation of joint venture formerly accounted for under the equity method of accounting       $ 0 $ 0 $ 19,200,000                
Home Health and Hospice | Alacare                            
Business Acquisition [Line Items]                            
Fair value of equity interest prior to acquisition     $ 217,800,000                      
Home Health and Hospice | Care Resource Group                            
Business Acquisition [Line Items]                            
Number of locations | location                           2
Home Health and Hospice | Home health | Alacare                            
Business Acquisition [Line Items]                            
Number of locations     23                      
Home Health and Hospice | Hospice | Alacare                            
Business Acquisition [Line Items]                            
Number of locations | location     23                      
Corporate Joint Venture | Inpatient Rehabilitation | Shannon Medical                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired                   51.00%        
Number of beds acquired | bed                   14        
Corporate Joint Venture | Inpatient Rehabilitation | Heritage Valley                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired                 75.00%       75.00%  
Number of beds acquired | bed                 16       11  
Corporate Joint Venture | Inpatient Rehabilitation | ECHD Ventures                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired               65.00%            
Number of beds acquired | bed               22            
Corporate Joint Venture | Inpatient Rehabilitation | Shannon Medical, Heritage Valley & ECHD Ventures                            
Business Acquisition [Line Items]                            
Goodwill expected to be tax-deductible       $ 0                    
Corporate Joint Venture | Inpatient Rehabilitation | Portercare Adventist                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired                       68.00%    
Number of beds acquired | bed                       13    
Number of beds contributed | bed                       40    
Number of beds expanded | bed                       20    
Corporate Joint Venture | Inpatient Rehabilitation | Premier Health Partners                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired                     51.00%      
Number of beds acquired | bed                     45      
Number of de novo beds | bed                     60      
Corporate Joint Venture | Inpatient Rehabilitation | Portercare Adventist and Premier Health Partners                            
Business Acquisition [Line Items]                            
Goodwill expected to be tax-deductible                     $ 0      
Corporate Joint Venture | Inpatient Rehabilitation | Saint Alphonsus                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired     51.00%                      
Number of beds acquired | bed     30                      
Number of de novo beds | location     40                      
Corporate Joint Venture | Home Health and Hospice                            
Business Acquisition [Line Items]                            
Fair value of equity interest prior to acquisition   $ 4,000,000                        
Corporate Joint Venture | Home Health and Hospice | Heart of the Rockies Home Health                            
Business Acquisition [Line Items]                            
Equity method investment, ownership percentage   50.00%                        
Corporate Joint Venture | Home Health and Hospice | Hospice of Southwest Montana                            
Business Acquisition [Line Items]                            
Equity method investment, ownership percentage   90.00%                        
Equity method investment, additional ownership percentage   40.00%                        
Corporate Joint Venture | Home Health and Hospice | Home health | Frontier Home Health And Hospice                            
Business Acquisition [Line Items]                            
Number of locations | location   9                        
Corporate Joint Venture | Home Health and Hospice | Hospice | Frontier Home Health And Hospice                            
Business Acquisition [Line Items]                            
Number of locations | location   11                        
Corporate Joint Venture | Other Home Health and Hospice Acquisitions | Saint Alphonsus | Subsequent Event                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired 50.00%                          
Escrow agent cost $ 15,900,000                          
Corporate Joint Venture | Other Home Health and Hospice Acquisitions | Baptist Outpatient Services, Inc                            
Business Acquisition [Line Items]                            
Business acquisition percentage of voting interests acquired       29.00%                    
Goodwill expected to be tax-deductible       $ 3,900,000                    
Equity method investment, ownership percentage       80.00%     51.00%              
Goodwill increase       $ 8,000,000                    
Gain on consolidation of joint venture formerly accounted for under the equity method of accounting       $ 3,200,000