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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Parenthetical) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Aug. 31, 2020	Sep. 30, 2021	Apr. 08, 2021
Mervyns II
Variable Interest Entity [Line Items]
Recallable distributions	$ 15.7
Distribution recalled during period		$ 7.0
Mervyns II | Acadia
Variable Interest Entity [Line Items]
Recallable distributions	$ 4.5
Distribution recalled during period		$ 2.0
Fund V
Variable Interest Entity [Line Items]
Investment, maturity date			Aug. 25, 2022

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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