Business and Organization - Additional Information (Detail)	6 Months Ended
	Jun. 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]
Number of units to be purchased under purchase agreement	197
Stabilized Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	24
Unstabilized Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
Properties Under Development [Member]
Real Estate Properties [Line Items]
Number of real estate properties	10