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Impairment (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
ft²
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Real Estate [Line Items]      
Impairment of real estate $ 0 $ 48,738,000  
Carrying value 6,801,668,000   $ 6,685,069,000
Impairment of investment in real estate and other affiliates $ 0 $ 0  
Fair Value, Measurements, Nonrecurring | Measurement Input, Cap Rate | Discounted cash flow analysis      
Real Estate [Line Items]      
Fair value capitalization rate   0.100  
Outlet Collection At Riverwalk      
Real Estate [Line Items]      
Impairment of real estate   $ 48,700,000  
Area of real estate property (in sqft) | ft² 273,270    
Carrying value   $ 46,800,000