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Basis of Presentation - Additional Information (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
hospital
state
Jun. 30, 2023
USD ($)
hospital
state
Jun. 30, 2022
USD ($)
Jul. 01, 2023
bed
Class of Stock [Line Items]        
Number of states in which entity operates | state 37 37    
Number of inpatient rehabilitation hospitals operated 158 158    
Number of solely owned inpatient rehabilitation hospitals 97 97    
Number of jointly owned inpatient rehabilitation hospitals 61 61    
Contributions from noncontrolling interests of consolidated affiliates | $   $ 46.3 $ 35.3  
Hospital in Bowie, Maryland | Corporate Joint Venture        
Class of Stock [Line Items]        
Contributions from noncontrolling interests of consolidated affiliates | $ $ 26.3      
Subsequent Event | Hospital in Bowie, Maryland | Corporate Joint Venture        
Class of Stock [Line Items]        
Number of beds | bed       60
Remaining noncontrolling interest       50.00%
Minimum        
Class of Stock [Line Items]        
Joint venture ownership percentage 50.00% 50.00%    
Maximum        
Class of Stock [Line Items]        
Joint venture ownership percentage 97.50% 97.50%