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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2022
USD ($)
Segment
Oct. 01, 2021
USD ($)
Segment
Jan. 19, 2021
USD ($)
Aug. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Facility
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Facility
Bed
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Significant Accounting Policies [Line Items]                      
Unfavorable adjustment for professional and general liability claims                 $ 5,900,000    
Professional and general liability reserve         $ 103,600,000 $ 87,800,000     103,600,000 $ 87,800,000  
Professional and general liability reserve current         12,100,000 11,900,000     12,100,000 11,900,000  
Professional and general liability reserve noncurrent         91,500,000 75,900,000     91,500,000 75,900,000  
Insurance receivable         37,800,000 37,900,000     37,800,000 37,900,000  
Insurance receivable - current portion         10,158,000 10,807,000     10,158,000 10,807,000  
Insurance receivable noncurrent         27,600,000 27,100,000     27,600,000 27,100,000  
Workers compensation insurance claims deductible per accident                 500,000    
Reserve for workers compensation liability                 24,200,000 23,600,000  
Accrued salaries and benefits         12,000,000.0 12,000,000.0     12,000,000.0 12,000,000.0  
Other long-term liabilities         12,200,000 11,600,000     12,200,000 11,600,000  
Depreciation expense                 $ 117,800,000 106,700,000 $ 95,300,000
Number of beds, replacement facility | Bed               260      
Non-cash property impairment charge relating to existing facility             $ 1,100,000 $ 23,200,000   24,300,000  
Impairment of long-lived assets $ 0 $ 0     $ 0 $ 0         $ 4,200,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Other operating expenses Other operating expenses     Other operating expenses Other operating expenses         Other operating expenses
Number of reporting units | Segment 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   $ 2,449,000  
Intangible assets for the disposition           $ 100,000   $ 200,000      
ASU 2021-10 [Member]                      
Significant Accounting Policies [Line Items]                      
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]         true       true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date         Dec. 31, 2022       Dec. 31, 2022    
U.S. Facilities [Member]                      
Significant Accounting Policies [Line Items]                      
Goodwill impairment loss                 $ 0    
Discontinued Operations [Member] | U.K. Facilities [Member]                      
Significant Accounting Policies [Line Items]                      
Proceeds from U.K. Sale     $ 1,525,000,000                
Goodwill impairment loss                 356,200,000   $ 356,200,000
Closed Facilities [Member] | U.S. Facilities [Member]                      
Significant Accounting Policies [Line Items]                      
Non-cash impairment charge related to indefinite-lived assets                     $ 600,000
Maximum [Member]                      
Significant Accounting Policies [Line Items]                      
Maximum self insured professional liability limit per claim       $ 10,000,000.0         5,000,000.0    
Maximum professional liability aggregate policy limit                 $ 75,000,000.0    
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                 $ 10,000,000.0    
Maximum professional liability aggregate policy limit                 $ 70,000,000.0    
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