Segment Reporting - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Real estate at cost	$ 4,135,328	$ 4,168,291	$ 4,135,328	$ 4,168,291
Total assets	4,244,645	4,251,408	4,244,645	4,251,408	$ 4,186,882
Net (income) loss attributable to noncontrolling interests	(19,488)	$ 29,259	(13,499)	35,388
Opportunity Funds | Fund II's City Point Property
Segment Reporting Information [Line Items]
Real estate at cost	654,000		654,000
Total assets	$ 606,600		606,600
Net (income) loss attributable to noncontrolling interests			$ 190,000	$ 176,500