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Impairment (Details)	3 Months Ended			6 Months Ended
Impairment (Details)	Jun. 30, 2021 USD ($) a ft² building	Jun. 30, 2020 USD ($) hotel_room	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) a ft²	Jun. 30, 2020 USD ($) hotel_room	Mar. 31, 2021 ft²	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Impairment of real estate	$ 13,068,000	$ 0		$ 13,068,000	$ 48,738,000
Carrying value	6,911,457,000			6,911,457,000			$ 6,685,069,000
Impairment of investment in real estate and other affiliates	$ 0			$ 0
Minimum
Real Estate [Line Items]
Assumed lease-up period	24 months
Maximum
Real Estate [Line Items]
Assumed lease-up period	48 months
Condominium Inventory
Real Estate [Line Items]
Other asset impairment charge		5,100,000
Mr. C Seaport
Real Estate [Line Items]
Impairment of investment in real estate and other affiliates		$ 6,000,000.0
Equity method investment, ownership percentage		35.00%			35.00%
Equity method investment, proceeds from sale		$ 800,000
Equity Method Investments
Real Estate [Line Items]
Number of buildings \| building	17
Equity Method Investments \| Mr. C Seaport
Real Estate [Line Items]
Number of hotel rooms \| hotel_room		66			66
Fair Value, Measurements, Nonrecurring \| Measurement Input, Cap Rate \| Valuation, Income Approach
Real Estate [Line Items]
Fair value capitalization rate	0.0875			0.0875
Fair Value, Measurements, Nonrecurring \| Measurement Input, Cap Rate \| Discounted cash flow analysis
Real Estate [Line Items]
Fair value capitalization rate			0.10				0.100
Century Park
Real Estate [Line Items]
Impairment of real estate	$ 13,100,000
Area of land \| a	63			63
Area of real estate property (in sqft) \| ft²	1,300,000			1,300,000
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