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Organization (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2018 shares | Dec. 31, 2018 community | Dec. 31, 2018 building | Dec. 31, 2018 | Dec. 31, 2018 investment | Dec. 31, 2018 apartment | Dec. 31, 2018 project
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |
General partner ownership interest | 96.60% | 96.70% |  |  |  |  |  |  |
Limited partner - ownership percentage |  | 3.40% |  |  |  | 3.40% |  |  |
Operating Partnership units outstanding (in shares) | shares |  | 2,268,114 | 2,305,389 |  |  |  |  |  |
Redemption value of Operating Partnership units outstanding | $ | $ 565.3 | $ 547.5 |  |  |  |  |  |  |
Number of apartment communities owned | community |  |  |  | 245 |  |  |  |  |
Number of apartment units owned | apartment |  |  |  |  |  |  |  | 59,661 |
Ownership interests, number of commercial buildings | building |  |  |  |  | 1 |  |  |  |
Ownership interests, number of active development projects |  |  |  |  |  |  | 2 |  | 6

X
- Definition Aggregate number of apartment units owned as of the balance sheet date. + References No definition available. + Details
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- Definition Noncontrolling interest in Operating Partnership, which includes the Operating Partnership's vested long term incentive plan units and cumulative redeemable preferred units. + References No definition available. + Details
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- Definition The number of apartment communities owned as of the balance sheet date. + References No definition available. + Details
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- Definition Operating partnership units owned by noncontrolling interest partners, including Long Term Incentive Plan Units which convert to Partnership units. + References No definition available. + Details
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- Definition The number of commercial buildings in which the company has an ownership interest. + References No definition available. + Details
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- Definition Description of redemption value of total operating partnership units. + References No definition available. + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- References No definition available. + Details
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