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Basis of Presentation - Additional Information (Details)
$ in Millions
 9 Months Ended
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
hospital
state
Sep. 30, 2022
USD ($)
Jul. 01, 2023
bed
Class of Stock [Line Items]        
Number of states in which entity operates | state   37    
Number of inpatient rehabilitation hospitals operated   159    
Number of solely owned inpatient rehabilitation hospitals   96    
Number of jointly owned inpatient rehabilitation hospitals   63    
Contributions from noncontrolling interests of consolidated affiliates | $   $ 54.7 $ 55.1  
Hospital in Bowie, Maryland | Corporate Joint Venture        
Class of Stock [Line Items]        
Number of beds | bed       60
Contributions from noncontrolling interests of consolidated affiliates | $ $ 26.3      
Remaining noncontrolling interest       50.00%
Minimum        
Class of Stock [Line Items]        
Joint venture ownership percentage   50.00%    
Maximum        
Class of Stock [Line Items]        
Joint venture ownership percentage   97.50%