Subsequent Events - Additional Information (Detail)	Sep. 30, 2012
Subsequent Event [Line Items]
Number of Units in Real Estate Property	49,723
Riverside [Member]
Subsequent Event [Line Items]
Number of Units in Real Estate Property	294
Hidden Lake [Member]
Subsequent Event [Line Items]
Number Of Unit Affected	320
Park Walk [Member]
Subsequent Event [Line Items]
Number Of Unit Affected	124
Paddock Club Florence [Member]
Subsequent Event [Line Items]
Number Of Unit Affected	200
Westbury Springs [Member]
Subsequent Event [Line Items]
Number Of Unit Affected	150