SEGMENTS (Details 5) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Reconciliation of total segment assets to total assets
Total segment assets	$ 3,219,531,000	$ 2,989,474,000
Total assets	3,719,230,000	3,503,042,000
Master Planned Communities
Reconciliation of total segment assets to total assets
Total segment assets	1,792,635,000	1,756,625,000
Operating Assets
Reconciliation of total segment assets to total assets
Total segment assets	1,130,601,000	944,562,000
Additional information
Increase (decrease) in assets	186,000,000
Increase (decrease) in capital spending related to development activities	85,600,000
Strategic Developments
Reconciliation of total segment assets to total assets
Total segment assets	296,295,000	288,287,000
Strategic Developments | 3 Waterway Square
Additional information
Reclassification of assets	61,800,000
Strategic Developments | One Hughes Landing
Additional information
Reclassification of assets	37,800,000
Corporate and other
Reconciliation of total segment assets to total assets
Total assets	$ 499,699,000	$ 513,568,000