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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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- 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 + Details
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- Definition 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 + Details
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