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Segment Information - Summary of Third-party Asset Management and Real Estate Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements	$ 14,125	$ 13,279	$ 53,120	$ 42,463
Reimbursements revenue	11,717	13,708	37,574	41,407
Third-party real estate services revenue, including reimbursements	25,842	26,987	90,694	83,870
Third-party real estate services expenses	25,542	28,207	80,035	86,260
Third-party real estate services revenue less expenses	300	(1,220)	10,659	(2,390)
Property management fees
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements	4,831	4,694	14,549	15,453
Asset management fees
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements	2,145	2,301	6,602	7,400
Development fees
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements	4,032	2,614	22,705	8,474
Development fees | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Segment Reporting Information
Revenue, Remaining Performance Obligation, Amount	$ 51,200		$ 51,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 years		6 years
Leasing fees
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements	$ 1,822	1,086	$ 4,106	3,627
Construction management fees
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements		584	375	2,057
Other service revenue
Segment Reporting Information
Third-party real estate services revenue, excluding reimbursements	$ 1,295	$ 2,000	$ 4,783	$ 5,452

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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