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Commitments and Contingencies - Additional Information (Detail)
£ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2025
USD ($)
Sep. 27, 2024
USD ($)
Plaintiffs
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
GBP (£)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2025
GBP (£)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Line Items]                                    
Purchased several excess policies through commercial reinsurance carriers per occurrence excess claim amount     $ 30,000,000   $ 30,000,000                          
Self-insured for professional and general liability, current     100,000,000   100,000,000     $ 85,000,000                    
Compensation liability claims     149,000,000   149,000,000     137,000,000                    
Compensation and related benefits     64,000,000   64,000,000     58,000,000                    
Maximum insurance deductible     5,000,000   5,000,000                          
Self insurance reserve amount exhausted     10,000,000   10,000,000                          
Purchased several excess policies through commercial reinsurance amount exhausted     30,000,000   30,000,000                          
District Facilities                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Projected aggregate development and construction cost     $ 417,000,000   $ 417,000,000                          
Lease initial terms     75 years   75 years       75 years                  
Committment to expend         $ 21,000,000                          
Projected commitment expend period         12 years 12 years                        
Cumberland Hospital for Children and Adolescents                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Number of plaintiffs | Plaintiffs   40                                
Aggregate insurance coverage     $ 147,000,000   $ 147,000,000                          
Self-insured retention amounts     10,000,000   $ 10,000,000                          
Cumberland Hospital for Children and Adolescents | Compensatory Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded   $ 60,000,000                                
Cumberland Hospital for Children and Adolescents | Trebled Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded   180,000,000                                
Cumberland Hospital for Children and Adolescents | Punitive Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded   120,000,000                                
Punitive damage amount, per plaintiff   $ 350,000                                
Cumberland Hospital for Children and Adolescents | Compensatory Damages, Trebled Damages And Punitive Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Number of plaintiffs | Plaintiffs   3                                
Pinnacle Medical Group                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Legal reserve     $ 18,000,000                              
Pinnacle Medical Group | Compensatory Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded $ 4,700,000                                  
Pinnacle Medical Group | Punitive Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded 500,000,000                                  
Pinnacle Medical Group | UHS of Delaware, Inc.                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Non-controlling ownership interests     50.00%   50.00%       50.00%                  
Wind Storms                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     $ 250,000,000   $ 250,000,000                          
Wind Storms | PUERTO RICO                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     100,000,000   100,000,000                          
Earthquake Wind Hail and Flood                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Maximum insurance deductible     5,000,000   5,000,000                          
All Other Events                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Maximum insurance deductible     5,000,000   5,000,000                          
Cygnet Health Care Limited                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Property insurance | £           £ 2,300                        
Property insurance per occurrence | £           £ 150                        
Maximum                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured for professional and general liability     10,000,000   10,000,000                          
Purchased several excess policies through commercial insurance carriers per occurrence     25,000,000   25,000,000                          
Commercial property insurance policies covering catastrophic losses     $ 1,000,000,000   $ 1,000,000,000                          
Lease initial terms     10 years   10 years       10 years                  
Maximum | Cumberland Hospital for Children and Adolescents | Punitive Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded   $ 1,050,000.00                                
Maximum | Pinnacle Medical Group | Punitive Damages                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Damages awarded $ 14,000,000                                  
Maximum | Wind Storms                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Percentage of insurance deductible     5.00%   5.00%       5.00%                  
Maximum | Earthquake | CALIFORNIA                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     $ 150,000,000   $ 150,000,000                          
Maximum | Earthquake | South Carolina                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     100,000,000   100,000,000                          
Maximum | Earthquake | PUERTO RICO                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     40,000,000   40,000,000                          
Maximum | Earthquake | OTHER STATES                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     250,000,000   250,000,000                          
Maximum | Flood                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     100,000,000   100,000,000                          
Maximum | Flood | PUERTO RICO                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     1,000,000   1,000,000                          
Maximum | Flood | Texas                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Commercial property insurance policies covering catastrophic losses     $ 10,000,000   $ 10,000,000                          
Minimum                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Lease initial terms     5 years   5 years       5 years                  
Loss on business interruption insurance recovery         $ 15,000,000                          
Minimum | District Facilities                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Committment to expend         $ 75,000,000                          
Minimum | Wind Storms                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Percentage of insurance deductible     3.00%   3.00%       3.00%                  
Professional Liability | Cumberland Hospital for Children and Adolescents                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured retention amounts     $ 25,000,000   $ 25,000,000                          
General Liability | Cumberland Hospital for Children and Adolescents                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured retention amounts     3,000,000   3,000,000                          
General and Professional Liability                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured for professional and general liability     489,000,000   489,000,000     487,000,000                    
Self-insured for professional and general liability     35,000,000 $ 30,000,000 35,000,000   $ 44,000,000 79,000,000                    
Subsidiaries | Professional Liability | Cygnet Health Care Limited                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured for professional and general liability | £                 £ 20                  
Subsidiaries | Professional Liability | Maximum                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured for professional and general liability     20,000,000   20,000,000     20,000,000   $ 20,000,000 $ 20,000,000 $ 20,000,000 $ 10,000,000 $ 5,000,000 $ 5,000,000 $ 5,000,000 $ 10,000,000  
Subsidiaries | General Liability | Cygnet Health Care Limited                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured for professional and general liability | £                 £ 25                  
Subsidiaries | General Liability | Maximum                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Self-insured for professional and general liability     3,000,000   3,000,000     3,000,000   3,000,000 3,000,000 3,000,000 $ 3,000,000 $ 3,000,000 $ 3,000,000 $ 3,000,000 $ 3,000,000  
Subsidiaries | General And Professional Liability Insurance Policies | Maximum                                    
Commitments and Contingencies Disclosure [Line Items]                                    
Purchased several excess policies through commercial insurance carriers per occurrence     $ 110,000,000   $ 110,000,000     $ 175,000,000   $ 165,000,000 $ 162,000,000 $ 155,000,000           $ 250,000,000