Business and Organization - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014 Parcels
Real Estate Properties [Line Items]
Real estate property description	The Company generally considers a property to be stabilized when it reaches 80% occupancy or three years after acquisition or completion.
Options to acquire developable lands, number of parcels of developable land to be acquired	9
Interest acquired	100.00%
Liberty Apartments [Member]
Real Estate Properties [Line Items]
Business acquisition date	Jan. 17, 2014
Stabilized Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	25
Unstabilized Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	4
Properties Under Development [Member]
Real Estate Properties [Line Items]
Number of real estate properties	6