ACQUISITIONS AND DISPOSITIONS (Details 2) (USD $)	1 Months Ended	12 Months Ended	0 Months Ended		1 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Aug. 31, 2012	Dec. 31, 2012	May 14, 2012 Millennium Woodlands Phase II, LLC item	Aug. 15, 2012 70 Columbia Corporate Center sqft	Aug. 31, 2012 70 Columbia Corporate Center sqft	Dec. 31, 2013 70 Columbia Corporate Center	May 31, 2012 Millennium Waterway Apartments item	Dec. 31, 2012 Millennium Waterway Apartments	Jul. 02, 2011 The Woodlands item acre sqft	Jul. 31, 2011 The Woodlands	Jun. 30, 2011 The Woodlands	Dec. 31, 2011 The Woodlands	Dec. 31, 2013 The Woodlands	Dec. 31, 2011 The Woodlands
Acquisitions
Area of real estate property acquired (in square foot)				169,590
Percentage of appreciation in the market value of building					30.00%
Interest rate (as a percent)						4.25%	3.75%
Percentage of building leased at closing				23.70%
Area of building leased					76,308
Percentage of occupancy after lease is executed				68.70%
Amount deposited in escrow account				$ 5,000,000
Percentage of cumulative preferred return after debt service on amount invested in property					10.00%
Original contributed equity					5,000,000
Percentage distribution of excess proceeds after repayment of outstanding debt and preferred return	70.00%				30.00%
Purchase price				17,500,000					117,500,000
Number of units acquired in real estate property							393		865
Portion of refinanced mortgage proceeds used to acquire partner's interest		2,721,000					6,900,000		20,000,000
Non-recourse mortgage assumed							55,600,000
Term of debt instrument							10 years
Total assets consolidated into financial statements at fair value as of the acquisition date							78,600,000		587,558,000
Liabilities acquired consolidated							56,400,000		338,600,000
Ownership interest (as a percent)							100.00%
Revenues								4,400,000				84,600,000
Net income (loss)								(1,300,000)				500,000
Number of units in Class A multi-family unit in The Woodlands Town Center to be constructed			314				314
Percentage of economic interest acquired									47.50%
Percentage of legal interest acquired									57.50%
Area of unsold residential land acquired (in acres)									1,324
Lots of unsold residential land acquired									4,395
Area of unsold commercial land acquired (in acres)									962
Area of office space acquired (in square feet)									434,328
Area of retail and service space acquired (in square feet)									203,282
Number of room resorts and conference centre									440
Number of holes on the golf and country club acquired									36
Acquisition price represented by a non-interest bearing promissory note									97,500,000
Contingent consideration									0
Estimated useful life										40 years
After-tax loss on the remeasurement relating to existing economic interest											(3,900,000)
Existing economic interest (as a percent)											52.50%
Net book value of existing economic interest											134,800,000
Amounts recorded for the assets acquired and liabilities assumed at the acquisition date
Master Planned Community Assets									267,251,000
Land									44,597,000
Buildings and Equipment									116,061,000
Investments in Real Estate Affiliates									36,764,000
Cash									25,492,000
Accounts receivable									7,548,000
Notes receivable									3,189,000
Municipal Utility District receivables									61,700,000
Other assets									24,956,000
Total assets							78,600,000		587,558,000
Mortgages, notes and loans payable									(296,695,000)
Accounts payable and accrued expenses									(41,900,000)
Noncontrolling interests									(3,700,000)
Total liabilities and noncontrolling interests									(342,295,000)
Total identifiable net assets									245,263,000
Impact of increase in cost of sales on net loss												6,100,000
Pro Forma Information
Total revenues														357,472,000
Net income (loss)														$ 157,520,000
Effective tax rate (as a percent)													36.00%