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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2023
USD ($)
Oct. 01, 2022
USD ($)
Segment
Oct. 01, 2021
USD ($)
Segment
Jan. 19, 2021
USD ($)
Oct. 31, 2023
Segment
Aug. 31, 2023
USD ($)
Dec. 31, 2021
USD ($)
Facility
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Facility
Bed
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Significant Accounting Policies [Line Items]                        
Unfavorable adjustment for professional and general liability claims                   $ 5,300,000 $ 5,900,000  
Professional and general liability reserve                   109,400,000 103,600,000  
Professional and general liability reserve current                   12,500,000 12,100,000  
Professional and general liability reserve noncurrent                   96,900,000 91,500,000  
Insurance receivable                   62,300,000 37,800,000  
Insurance receivable - current portion                   33,579,000 10,158,000  
Insurance receivable noncurrent                   28,700,000 27,600,000  
Workers compensation insurance claims deductible per accident                   500,000    
Reserve for workers compensation liability                   26,800,000 24,200,000  
Accrued salaries and benefits                   12,000,000 12,000,000.0  
Other long-term liabilities                   14,800,000 12,200,000  
Depreciation expense                   $ 132,300,000 $ 117,800,000 $ 106,700,000
Number of beds, replacement facility | Bed                 260      
Non-cash property impairment charge relating to closure of facilities               $ 1,100,000 $ 23,200,000      
Impairment of long-lived assets $ 0 $ 0 $ 0                  
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Other operating expenses Other operating expenses Other operating expenses                  
Number of reporting units | Segment   1 1   1              
Number of outpatient | Facility             1   1      
Proceeds from U.K. Sale             $ 1,500,000   $ 4,300,000     $ 1,511,020,000
Goodwill write down             700,000   1,800,000      
Intangible assets for the disposition             $ 100,000   $ 200,000      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]                   Asset Impairment Charges    
Non-cash impairment charge related to indefinite-lived assets                   $ 5,400,000    
Loss on Impairment [Member]                        
Significant Accounting Policies [Line Items]                        
Non-cash property impairment charge relating to closure of facilities                   $ 2,000,000    
ASU 2021-10 [Member]                        
Significant Accounting Policies [Line Items]                        
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]                   true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date                   Dec. 31, 2022    
Discontinued Operations [Member] | U.K. Facilities [Member]                        
Significant Accounting Policies [Line Items]                        
Proceeds from U.K. Sale       $ 1,525,000,000                
Maximum [Member]                        
Significant Accounting Policies [Line Items]                        
Maximum self insured professional liability limit per claim           $ 5,000,000       $ 7,000,000    
Maximum professional liability aggregate policy limit           75,000,000       $ 78,000,000    
Maximum [Member] | Building and Improvements [Member]                        
Significant Accounting Policies [Line Items]                        
Property plant and equipment estimated useful life                   50 years    
Maximum [Member] | Equipment [Member]                        
Significant Accounting Policies [Line Items]                        
Property plant and equipment estimated useful life                   7 years    
Minimum [Member]                        
Significant Accounting Policies [Line Items]                        
Maximum professional liability retention limit           10,000,000       $ 10,000,000    
Maximum professional liability aggregate policy limit           $ 70,000,000       $ 75,000,000    
Minimum [Member] | Building and Improvements [Member]                        
Significant Accounting Policies [Line Items]                        
Property plant and equipment estimated useful life                   10 years    
Minimum [Member] | Equipment [Member]                        
Significant Accounting Policies [Line Items]                        
Property plant and equipment estimated useful life                   3 years