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Real Estate Acquisitions and Dispositions - Additional Information (Details) | Sep. 30, 2017 a apartmentunits | Mar. 31, 2017 apartmentunits
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Charlotte at MIdtown [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Number of Units in Real Estate Property | apartmentunits |  | 279
Colonial Grand at Lakewood Ranch [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Area of Land | a | 12 |
Paddock Club Lakeland [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Number of Units in Real Estate Property | apartmentunits | 464 |
Area of Land | a | 9 |
Northwood [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Number of Units in Real Estate Property | apartmentunits | 270 |
Town Park Lot [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Area of Land | a | 1 |
Paddock Club Montgomery [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Number of Units in Real Estate Property | apartmentunits | 208 |
Post Alexander [Member] |  |
Business Acquisitions and Dispositions [Line Items] |  |
Area of Land | a | 1 |

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- Definition Acquisitions and Disposals [Line Items] + References No definition available. + Details
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- Definition Area of land held. + References No definition available. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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