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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2021
USD ($)
Segment
Jan. 19, 2021
USD ($)
Aug. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Facility
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Facility
Bed
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Significant Accounting Policies [Line Items]                  
Maximum professional liability aggregate policy limit             $ 60,000,000.0    
Professional and general liability reserve       $ 87,800,000     87,800,000 $ 77,500,000  
Professional and general liability reserve current       11,900,000     11,900,000 9,700,000  
Professional and general liability reserve noncurrent       75,900,000     75,900,000 67,800,000  
Insurance receivable       37,900,000     37,900,000 27,200,000  
Insurance receivable - current portion       10,807,000     10,807,000 6,792,000  
Insurance receivable noncurrent       27,100,000     27,100,000 20,400,000  
Workers compensation insurance claims deductible per accident             500,000    
Reserve for workers compensation liability             23,600,000 23,000,000.0  
Accrued salaries and benefits       12,000,000.0     12,000,000.0 12,000,000.0  
Other long-term liabilities       11,600,000     11,600,000 11,000,000.0  
Depreciation expense             106,700,000 95,300,000 $ 87,900,000
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 4,200,000  
Impairment of long-lived assets $ 0     $ 0       4,200,000 $ 27,200,000
Number of reporting units | Segment 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      
Non-cash impairment charge related to indefinite-lived assets               600,000  
ASU 2017-12 [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       Jan. 01, 2019     Jan. 01, 2019    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]       true     true    
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     $ 3,000,000       $ 10,000,000.0    
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             $ 3,000,000    
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