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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
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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Acquisitions and Disposals [Line Items]

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Area of land held.

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Area of a real estate property.

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The number of units in a real estate property owned as of the balance sheet date.

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