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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Aug. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Significant Accounting Policies [Line Items]        
Maximum professional liability aggregate policy limit   $ 75,000,000    
Unfavorable adjustment for professional and general liability claims   52,700,000 $ 10,100,000  
Professional and general liability reserve   181,800,000 87,500,000  
Professional and general liability reserve current   31,400,000 12,500,000  
Professional and general liability reserve noncurrent   150,400,000 75,000,000  
Insurance receivable   28,800,000 9,300,000  
Insurance receivable - current portion   7,211,000 452,000  
Insurance receivable noncurrent   21,600,000 8,800,000  
Workers compensation insurance claims deductible per accident   500,000    
Reserve for workers compensation liability   34,300,000 30,700,000  
Accrued salaries and benefits   18,500,000 12,000,000.0  
Other long-term liabilities   15,800,000 18,700,000  
Depreciation expense   189,200,000 149,600,000 $ 132,300,000
Loss on Impairment [Member]        
Significant Accounting Policies [Line Items]        
Non-cash property impairment charge relating to closure of facilities   10,400,000 12,400,000  
Non-cash operating lease right-of-use asset impairment charge related to closure of facilities   $ 1,000,000 $ 1,400,000  
ASU 2023-07 [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, 2024    
Change in accounting principle, accounting standards update, immaterial effect [true false]   true    
ASU 2023-05 [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   Jan. 01, 2025    
Change in accounting principle, accounting standards update, immaterial effect [true false]   true    
ASU 2023-09 [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, 2025    
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false]   true    
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Maximum self insured professional liability limit per claim $ 10,000,000      
Maximum professional liability retention limit 25,000,000 $ 25,000,000    
Maximum professional liability aggregate policy limit 80,000,000      
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 15,000,000 $ 15,000,000    
Maximum professional liability aggregate policy limit $ 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