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Real Estate and Other Activities - 2021 Activity - Additional Information (Detail)
£ in Millions
Jan. 19, 2021
GBP (£)
Jan. 15, 2021
USD ($)
Jan. 15, 2021
GBP (£)
Jan. 08, 2021
USD ($)
Waterland Private Equity Fund VII C.V. [Member]        
Business Acquisition [Line Items]        
Funded for interim mortgage loan £ 800      
Payment for acquisition 800      
Purchase price of acquisition with 364-day acquisition loan £ 250      
Passive equity interest 9.90%      
Waterland Private Equity Fund VII C.V. [Member] | Interim Credit Facility [Member]        
Business Acquisition [Line Items]        
Line of credit facility, Borrowing capacity | $   $ 900,000,000    
Line of credit     £ 500  
Waterland Private Equity Fund VII C.V. [Member] | Revolving Credit Facility [Member]        
Business Acquisition [Line Items]        
Line of credit     £ 350  
Steward Health Care System LLC [Member]        
Business Acquisition [Line Items]        
Passive equity interest       9.90%
Other loan | $       $ 335,000,000