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Subsequent Events - Additional Information (Detail)
$ in Millions
Oct. 22, 2021
EUR (€)
Oct. 21, 2021
EUR (€)
Oct. 19, 2021
USD ($)
Facility
Oct. 06, 2021
EUR (€)
Sep. 30, 2021
Dec. 31, 2020
Subsequent Event [Member] | Springstone [Member] | Inpatient Behavioral Health Hospital Facilities [Member]            
Subsequent Event [Line Items]            
Number of facilities acquired | Facility     18      
Purchase price of acquisition | $     $ 950      
Subsequent Event [Member] | Portugal [Member] | Acute Care Facilities [Member]            
Subsequent Event [Line Items]            
Purchase price of acquisition   € 17,800,000        
0.993% Senior Unsecured Notes due 2026 [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Senior unsecured notes face amount       € 500,000,000    
Senior unsecured notes, payable term       interest on the notes is payable annually on October 15 of each year, commencing on October 15, 2022.    
Debt instrument maturity date       Oct. 15, 2026    
Senior unsecured notes, interest rate       0.993%    
4.000% Senior Unsecured Notes Due 2022 [Member]            
Subsequent Event [Line Items]            
Senior unsecured notes, interest rate [1]         4.00% 4.00%
4.000% Senior Unsecured Notes Due 2022 [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Senior unsecured notes, interest rate 4.00%          
Outstanding aggregate principal amount redeemed € 500,000,000          
Debt refinancing costs € 18,000,000          
Senior unsecured notes, maturity year 2022          
[1] Non-U.S. dollar denominated debt reflects the exchange rate at September 30, 2021 and December 31, 2020.