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Schedule III - Real Estate and Accumulated Depreciation-Encumbrances Reconciliation (Details) | Dec. 31, 2018 USD ($) Property
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Total Consolidated Investment in Real Estate [Member] |
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 2,385,470,484
Archstone Master Property [Member] |
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract] |
Number of Properties Encumbered | Property | 13
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 797,768,476
Portfolio Entity Encumbrances [Member] |
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract] |
Number of Properties Encumbered | Property | 13
Portfolio Entity Encumbrances [Member] |
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 797,768,476
Individual Property Encumbrances [Member] |
Overall summary of real estate and accumulated depreciation |
Encumbrances | $ 1,587,702,008

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- Definition Represents the number of rental properties encumbered by a lien or mortgage. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Overall summary of real estate and accumulated depreciation. + References No definition available. + Details
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- Definition Real estate and accumulated depreciation encumbrances reconciliation. + References No definition available. + Details
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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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