Real Estate Acquisitions and Dispositions - Additional Information (Detail)	Mar. 31, 2016 ft² a apartmentunits Apartments
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property | apartmentunits	79,896
Cobblestone Square [Member]
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property | Apartments	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	295,447
Area of Land	25