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Subsequent Events - Additional Information (Details) - USD ($) $ in Thousands | Jul. 21, 2021 | Jul. 07, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Subsequent Event [Line Items] |  |  |  |
Mortgage Loans On Real Estate |  |  | $ 117,280 | $ 101,450
Subsequent Event | Fairlane Green Property | Fund V | Mortgages |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage Loans On Real Estate |  | $ 40,300 |  |
Debt instrument, maturity date |  | Jun. 05, 2022 |  |
Scheduled principal payment |  | $ 6,600 |  |
Subsequent Event | 146 Geary Street Property | Fund IV | Mortgages |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage Loans On Real Estate | $ 22,900 |  |  |
Debt instrument, maturity date | Jul. 15, 2023 |  |  |
Scheduled principal payment | $ 3,600 |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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