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Real Estate and Other Activities - Other Investment Activities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jan. 08, 2021
COVID-19 Pandemic [Member]        
Business Acquisition [Line Items]        
Unfavorable non-cash fair value adjustment on investment     $ 6.8  
Aevis Victoria SA [Member]        
Business Acquisition [Line Items]        
Favorable non-cash fair value adjustment on investment   $ 1.9    
Ownership interest in joint venture under the cost method   4.90%    
Steward Health Care System LLC [Member]        
Business Acquisition [Line Items]        
Distribution on Steward equity investment $ 11.0      
Passive equity interest       9.90%