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Real Estate Acquisitions and Dispositions - Additional Information (Detail) | Sep. 30, 2016 apartmentunits Apartments | Jun. 30, 2016 ft² a Apartments | Mar. 31, 2016 Apartments
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Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | apartmentunits | 79,170 |  |
Autumn Park [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 402 |  |
Cobblestone Square [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property |  |  | 314
McKinney Land [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Square Footage of Real Estate Property | ft² |  | 30 |
Colonial Promenade Nord du Lac (Covington, LA) [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Square Footage of Real Estate Property | a |  | 295,447 |
Area of Land | a |  | 25 |
Residences at Fountainhead [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property |  | 322 |
Yale at 6th [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 352 |  |
Colonial Grand at Heathrow [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Area of Land | a |  | 11 |
Land Title Building [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Area of Land | a |  | 30,000 |
Colonial Promenade Huntsville [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Area of Land | a |  | 1 |
Corners at Crystal Lake [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 240 |  |
Glen Eagles [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 310 |  |
CV at Mill Creek [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 220 |  |
Abbington Place [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 152 |  |
CV at Stone Point [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 192 |  |
Colonial Village at Greystone [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 408 |  |
Innovation [Member] |  |  |
Business Acquisitions and Dispositions [Line Items] |  |  |
Number of Units in Real Estate Property | 336 |  |

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