Segment Reporting - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Real estate at cost	$ 4,043,253	$ 4,162,224	$ 4,043,253	$ 4,162,224
Total assets	4,089,612	4,328,748	4,089,612	4,328,748	$ 4,186,882
Net loss (income) attributable to noncontrolling interests	2,687	$ (45,496)	5,989	6,129
Opportunity Funds | Fund II's City Point Property
Segment Reporting Information [Line Items]
Real estate at cost	650,600		650,600
Total assets	$ 604,800		604,800
Net loss (income) attributable to noncontrolling interests			$ 189,000	$ 176,000