Investments in Partially Owned Entities - Summary of Company's Unconsolidated Joint Ventures Deemed to be VIEs (Details)	Sep. 30, 2025 ApartmentUnit Entity Property JointVenture Project PropertiesProjectsEntities
Variable Interest Entity [Line Items]
Properties \| Property	318
Apartment units	86,320
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Properties \| JointVenture	2
Properties/Projects/Entities \| PropertiesProjectsEntities	12
Apartment units	2,877
Variable Interest Entity, Not Primary Beneficiary \| Operating Properties [Member]
Variable Interest Entity [Line Items]
Properties \| Property	3
Apartment units	1,169
Variable Interest Entity, Not Primary Beneficiary \| Development Lease-Up Projects [Member]
Variable Interest Entity [Line Items]
Properties \| Property	2
Apartment units	543
Variable Interest Entity, Not Primary Beneficiary \| Real Estate Holdings [Member]
Variable Interest Entity [Line Items]
Entities \| Entity	3
Variable Interest Entity, Not Primary Beneficiary \| Projects Under Development [Member]
Variable Interest Entity [Line Items]
Project \| Project	2
Apartment units	639
Variable Interest Entity, Not Primary Beneficiary \| Projects Held for Development [Member]
Variable Interest Entity [Line Items]
Project \| Project	2
Apartment units	526

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-25

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-25

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

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