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Real Estate and Other Activities - Other Investment Activities - Additional Information (Detail)
€ in Millions, SFr in Millions
12 Months Ended
Oct. 13, 2021
EUR (€)
Jan. 08, 2021
USD ($)
Jun. 28, 2019
CHF (SFr)
Dec. 31, 2021
USD ($)
COVID-19 Pandemic [Member]        
Business Acquisition [Line Items]        
Unfavorable non-cash fair value adjustment on investment       $ 5,800
Aevis Victoria SA [Member]        
Business Acquisition [Line Items]        
Purchase price of acquisition | SFr     SFr 47  
Favorable non-cash fair value adjustment on investment       $ 8,200
Ownership interest in joint venture under the cost method     4.90% 4.90%
Priory Group [Member]        
Business Acquisition [Line Items]        
Purchase price of acquisition | € € 27      
Ownership interest 9.90%      
Steward Health Care System LLC [Member]        
Business Acquisition [Line Items]        
Distribution on Steward equity investment   $ 11,000,000    
Ownership interest   9.90%