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Investments in Unconsolidated Real Estate Funds - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Investment Holdings [Line Items] |  |  |  |  |
Investments in unconsolidated real estate funds | $ 12,867,000 |  | $ 12,867,000 |  | $ 10,317,000
(Loss) income from unconsolidated real estate funds | (56,000) | $ 206,000 | 85,000 | $ 271,000 |
Fund VIII [Member] |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Capital commitments |  |  | 775,200,000 |  |
Capital commitments invested | $ 627,088,000 |  | $ 627,088,000 |  |
Alternative Investment Fund, Interest Rate | 1.30% |  | 1.30% |  |
Fund X [Member] |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Capital commitments |  |  | $ 192,000,000 |  |
Capital commitments invested | $ 78,791,000 |  | $ 78,791,000 |  |
Alternative Investment Fund, Interest Rate | 7.80% |  | 7.80% |  |

X
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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- Definition Amount of funds committed to investment company from investors. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10491-115837 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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