SUBSEQUENT EVENTS (Details) (USD $)	1 Months Ended
	Oct. 22, 2012
Common stock issued during period [Member]
Subsequent Event [Line Items]
Common stock issued during period, shares [Line Items]	357,692
Common stock issued during period, average sales price per share [Line Items]	$ 53.30
Common stock issued during period, net proceeds to company [Line Items]	$ 18,900,000
Common stock remaining to sell under the program	1,543,933
World Houston 37 [Member] | Development starts during period [Member]
Subsequent Event [Line Items]
Square Footage of Real Estate Property	101,000
Projected total cost of development property	7,100,000
World Houston 38 [Member] | Development starts during period [Member]
Subsequent Event [Line Items]
Square Footage of Real Estate Property	129,000
Projected total cost of development property	$ 9,800,000