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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]        
Maximum professional liability aggregate policy limit   $ 75,000,000.0    
Professional and general liability reserve $ 77,500,000 77,500,000 $ 52,600,000  
Professional and general liability reserve current 9,700,000 9,700,000 4,700,000  
Professional and general liability reserve noncurrent 67,800,000 67,800,000 47,900,000  
Insurance receivable 27,200,000 27,200,000 8,500,000  
Insurance receivable - current portion 6,792,000 6,792,000 3,030,000  
Insurance receivable noncurrent 20,400,000 20,400,000 5,500,000  
Workers compensation insurance claims deductible per accident   500,000    
Reserve for workers compensation liability   23,000,000.0 20,800,000  
Accrued salaries and benefits 12,000,000.0 12,000,000.0 10,000,000.0  
Other long-term liabilities $ 11,000,000.0 11,000,000.0 10,800,000  
Depreciation expense   95,300,000 87,900,000 $ 80,300,000
Impairment of long-lived assets   4,200,000 $ 27,200,000 $ 0
Non-cash impairment charge related to indefinite-lived assets   $ 600,000    
Number of operating segment | Segment 1      
Number of reporting unit | Segment 1      
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]        
Goodwill impairment loss   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   $ 3,000,000.0    
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   $ 3,000,000.0    
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