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Increase of additional borrowings on existing and new debt instruments.

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REAL ESTATE AFFILIATES (Details) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended	3 Months Ended		6 Months Ended			6 Months Ended			0 Months Ended			0 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended			0 Months Ended						3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended			0 Months Ended	1 Months Ended			0 Months Ended				6 Months Ended		0 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended	0 Months Ended
REAL ESTATE AFFILIATES (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	May 31, 2012 Millennium Waterway Apartments item	Jun. 30, 2013 Equity method investments	Jun. 30, 2012 Equity method investments	Jun. 30, 2013 Equity method investments	Jun. 30, 2012 Equity method investments	Dec. 31, 2012 Equity method investments	Jun. 30, 2013 Cost basis investments	Jun. 30, 2012 Cost basis investments	Dec. 31, 2012 Cost basis investments	Sep. 17, 2012 A & B Properties, Inc.	Jun. 30, 2013 Circle T Equity method investments	Dec. 31, 2012 Circle T Equity method investments	Apr. 19, 2012 Forest View/Timbermill Apartments	Jun. 30, 2012 Forest View/Timbermill Apartments Equity method investments	Jun. 30, 2012 Forest View/Timbermill Apartments Equity method investments	Oct. 31, 2011 HHMK Development item	Jun. 30, 2013 HHMK Development Equity method investments	Jun. 30, 2013 HHMK Development Equity method investments	Dec. 31, 2012 HHMK Development Equity method investments	Jun. 30, 2012 Millennium Waterway Apartments Equity method investments	Jun. 30, 2012 Millennium Waterway Apartments Equity method investments	Jun. 30, 2013 Millennium Waterway Apartments Equity method investments	Dec. 31, 2012 Millennium Waterway Apartments Equity method investments	Jul. 05, 2012 Millennium Woodlands Phase II, LLC. acre	May 04, 2012 Millennium Woodlands Phase II, LLC. item	Jun. 30, 2013 Millennium Woodlands Phase II, LLC. Equity method investments	Dec. 31, 2012 Millennium Woodlands Phase II, LLC. Equity method investments	Jun. 30, 2013 Parcel D Development, LLC Equity method investments	Dec. 31, 2012 Parcel D Development, LLC Equity method investments	Jun. 30, 2013 Stewart Title Equity method investments	Jun. 30, 2012 Stewart Title Equity method investments	Jun. 30, 2013 Stewart Title Equity method investments	Jun. 30, 2012 Stewart Title Equity method investments	Dec. 31, 2012 Stewart Title Equity method investments	Jun. 30, 2013 Woodlands Sarofim # 1 Equity method investments	Jun. 30, 2012 Woodlands Sarofim # 1 Equity method investments	Jun. 30, 2013 Woodlands Sarofim # 1 Equity method investments	Jun. 30, 2012 Woodlands Sarofim # 1 Equity method investments	Dec. 31, 2012 Woodlands Sarofim # 1 Equity method investments	Oct. 27, 2011 Columbia Parcel D Joint Venture	May 31, 2013 Summerlin Las Vegas Baseball Club	Aug. 31, 2012 Summerlin Las Vegas Baseball Club	Aug. 06, 2012 Summerlin Las Vegas Baseball Club	Aug. 06, 2012 Summerlin Las Vegas Baseball Club Las Vegas 51S LLC	Jun. 30, 2013 Summerlin Las Vegas Baseball Club Equity method investments	Dec. 31, 2012 Summerlin Las Vegas Baseball Club Equity method investments	Jun. 30, 2013 Properties owned by real estate affiliates	Jun. 30, 2013 Construction loan	Jun. 30, 2013 Construction loan Columbia Parcel D Joint Venture	May 15, 2013 KR Holdings, LLC	Sep. 17, 2012 KR Holdings, LLC	Jun. 14, 2012 KR Holdings, LLC	Jun. 30, 2013 KR Holdings, LLC Equity method investments	Jun. 30, 2013 KR Holdings, LLC Equity method investments	Dec. 31, 2012 KR Holdings, LLC Equity method investments item	Sep. 17, 2012 KR Holdings, LLC Mezzanine loan agreements item
Real Estate Affiliates
Carrying values of the assets associated with the operations of the consolidated VIEs	$ 34,100,000		$ 34,100,000		$ 28,300,000
Carrying values of the liabilities associated with the operations of the consolidated VIEs	2,300,000		2,300,000		1,000,000
Number of local development partners																					2																																							2
Ownership ratio in a joint venture (as a percent)																																																	100.00%								50.00%			50.00%
Number of debt instruments																																																													2
Amount of borrowings																																																						64,100,000							40,000,000
Blended interest rate (as a percent)																																																													12.00%
Option to extend, term																																																													1 year
Preferred return, on capital (as a percent)																																																								13.00%
Maximum share in the profits of joint venture															3,000,000
Net cash proceeds from sale of condominium rights																																																							30,800,000
Percentage of in substance real estate sold																																																							50.00%
Cash contributed by joint venture partner																													3,000,000																600,000										16,800,000
Cash contributed by joint venture partner																																																						7,600,000
Amount funded in cash to joint venture																																														10,200,000	300,000
Percentage of ownership interest of partners in joint venture																																																							50.00%
Maximum Facility Amount																																																					132,000,000
Variable rate basis																																																					one-month LIBOR	LIBOR
Interest rate margin (as a percent)																																																					3.00%	2.40%
Committed pre-development costs																																																													3,000,000
Area of land contributed to the joint venture (in acres)																													4.8
Fair value of the land contributed to joint venture																													15,500,000																20,300,000
Construction loan secured																													37,700,000
Economic/Legal ownership (as a percent)																50.00%	50.00%					50.00%	50.00%	50.00%			100.00%	100.00%			81.43%	81.43%	50.00%	50.00%	50.00%		50.00%		50.00%	20.00%		20.00%		20.00%				50.00%		50.00%	50.00%							50.00%	50.00%	50.00%
Aggregate carrying value of unconsolidated VIEs	32,700,000		32,700,000		8,100,000
Investment in Real Estate Affiliates
Economic/Legal ownership (as a percent)																50.00%	50.00%					50.00%	50.00%	50.00%			100.00%	100.00%			81.43%	81.43%	50.00%	50.00%	50.00%		50.00%		50.00%	20.00%		20.00%		20.00%				50.00%		50.00%	50.00%							50.00%	50.00%	50.00%
Carrying Value	56,732,000		56,732,000		32,179,000		48,118,000		48,118,000		23,402,000	8,614,000		8,777,000		9,036,000	9,004,000					163,000	163,000	1,257,000							2,196,000	2,190,000	6,302,000	4,330,000	3,887,000		3,887,000		3,871,000	2,526,000		2,526,000		2,450,000						10,500,000	300,000							13,508,000	13,508,000
Share of Earnings/Dividends	5,707,000	446,000	8,440,000	3,122,000			5,707,000	446,000	5,937,000	746,000		2,503,000	2,376,000						2,000	4,000		153,000	153,000		185,000	406,000									326,000	257,000	517,000	316,000		37,000	2,000	76,000	20,000															5,191,000	5,191,000
Number of units acquired in real estate property						393
Portion of refinanced mortgage proceeds used to acquire partner's interest						6,900,000
Non-recourse mortgage assumed						55,600,000
Term of debt instrument						10 years
Interest rate (as a percent)						3.75%
Total assets consolidated into financial statements at fair value as of the acquisition date						78,600,000
Total liabilities consolidated into financial statements at fair value as of the acquisition date						56,400,000
Ownership interest (as a percent)						100.00%
Secured debt																																																				56,700,000
Share of the entity in secured debt																																																				29,500,000
Share of distributable cash																		$ 8,600,000
Number of units in Class A multi-family unit in The Woodlands Town Center to be constructed																														314