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Summary of Significant Accounting Policies - Investment Properties (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
item
Sep. 30, 2020
USD ($)
item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Real Estate Properties [Line Items]          
Land $ 3,700,023   $ 3,639,353 $ 3,700,023  
Buildings and improvements 33,908,615   33,857,863 33,908,615  
Total land, buildings and improvements 37,608,638   37,497,216 37,608,638  
Furniture, fixtures and equipment 441,558   435,150 441,558  
Investment properties at cost 38,050,196   37,932,366 38,050,196  
Less - accumulated depreciation 14,891,937   15,621,127 14,891,937  
Investment properties, at cost, net 23,158,259   22,311,239 23,158,259  
Construction in progress, included above 773,061   797,519 773,061  
Capitalized interest     $ 31,204 $ 22,917 $ 33,342
Buildings and improvements | Minimum          
Real Estate Properties [Line Items]          
Useful life     10 years    
Buildings and improvements | Maximum          
Real Estate Properties [Line Items]          
Useful life     35 years    
Equipment and fixtures | Minimum          
Real Estate Properties [Line Items]          
Useful life     7 years    
Equipment and fixtures | Maximum          
Real Estate Properties [Line Items]          
Useful life     10 years    
Consolidated properties          
Real Estate Properties [Line Items]          
Impairment of real estate $ 34,400        
Number of properties impaired | item 1        
Unconsolidated properties          
Real Estate Properties [Line Items]          
Impairment charge to reduce investment to its estimated fair value   $ 55,200      
Number of joint ventures determined to be impaired | item   3