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Segment Information - Additional Information (Detail) - 9 months ended Sep. 30, 2017 individual in Millions | Total | Property | States | Communities | individual
--- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Number of owned or owned interests of apartment communities |  | 303 |  | 302 |
Number of states in which apartment units are located | States |  |  | 17 |  |
Period properties owned and stabilized | 12 months |  |  |  |
Occupancy Level for Stabilized Communities | 90.00% |  |  |  |
Period Properties Stabilized | 90 days |  |  |  |
Large Market Same Store [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Apartment Community Population |  |  |  |  | 1
Percentage of Total Public Multifamily REIT Units | 1.00% |  |  |  |
Period properties owned and stabilized | 12 months |  |  |  |
Secondary Market Same Store [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Apartment Community Population |  |  |  |  | 1
Percentage of Total Public Multifamily REIT Units | 1.00% |  |  |  |
Period properties owned and stabilized | 12 months |  |  |  |

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