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Segment Information Segment Information - Additional Information (Detail) - 12 months ended Dec. 31, 2017 | Total | Property | States | Communities
--- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |
Number of Real Estate Properties |  | 302 |  | 301
Number of states in which apartment units are located (states) |  |  | 17 |
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 Period properties owned and stabilized + References No definition available. + Details
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- Definition Period Properties Stabilized + 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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