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Real Estate - Real Estate Under Development and Construction in Progress - Additional Information (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Jun. 30, 2021 Property	Mar. 31, 2021 Property	Dec. 31, 2020 USD ($) Property	Mar. 31, 2020 Property	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Notes receivable, net | $			$ 101,450		$ 101,450	$ 158,468
Fund IV
Property, Plant and Equipment [Line Items]
Number of projects put into service during period | Property				1
Fund II
Property, Plant and Equipment [Line Items]
Notes receivable, net | $			33,800		33,800
Core Portfolio
Property, Plant and Equipment [Line Items]
Number of projects put into service during period | Property	1
Fund Portfolio
Property, Plant and Equipment [Line Items]
Notes receivable, net | $			$ 33,800		33,800
Fund Portfolio | Fund IV
Property, Plant and Equipment [Line Items]
Number of projects put into service during period | Property		1	2
Impairment charge | $			$ 16,500		$ 16,500
Cortlandt Crossing | Fund III
Property, Plant and Equipment [Line Items]
Number of projects put into service during period | Property				1

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Number of real estate projects put into service during period.

+ References

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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