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Segment Information (Textual) (Details) - 12 months ended Dec. 31, 2017 individual in Millions | Total | Property | Communities | States | individual
--- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Real Estate Properties |  | 302 | 301 |  |
Number of states in which apartment units are located (states) | States |  |  |  | 17 |
Market Population (individuals) | individual |  |  |  |  | 1
Percentage of Total Public Multifamily REIT Units | 1.00% |  |  |  |
Period properties owned and stabilized (months) | 12 months |  |  |  |
Occupancy Level for Stabilized Communities | 90.00% |  |  |  |
Period Properties Stabilized | 90 days |  |  |  |

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- Definition Occupancy Level for Stabilized Communities + References No definition available. + Details
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- Definition Percentage of Total Public Multifamily REIT Units + References No definition available. + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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