Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified					9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Highlands of West Village [Member] sqft Apartments	Sep. 30, 2014 Bulverde Oaks [Member] Apartments	Sep. 30, 2014 Term Loan [Member]	Sep. 30, 2014 Minimum [Member] Term Loan [Member]	Sep. 30, 2014 Maximum [Member] Term Loan [Member]	Dec. 31, 2014 Notes payable Minimum [Member] Term Loan [Member]	Dec. 31, 2014 Notes payable Maximum [Member] Term Loan [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 150
Debt Instrument, Basis Spread on Variable Rate					1.10%	2.05%	0.90%	1.90%
Number of Units in Real Estate Property	81,137	480	328
Square Footage of Real Estate Property		63,000