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Investments in Partially Owned Entities - Summary of Information on Total Unconsolidated Development Joint Ventures (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 USD ($) JointVenture Apartment | Sep. 30, 2021 USD ($)
Variable Interest Entity [Line Items] |  |
Investments in unconsolidated entities - acquisitions | $ 49,330 | $ 21,787
Unconsolidated VIE [Member] |  |
Variable Interest Entity [Line Items] |  |
Number of unconsolidated joint ventures | JointVenture | 2 |
Apartment units | Apartment | 797 |
Unconsolidated VIE [Member] | Equity Residential [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments in unconsolidated entities - acquisitions | $ 49,330 |

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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