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IMPAIRMENT (Details) (USD $)
12 Months Ended
Dec. 31, 2012
sqft
Dec. 31, 2011
Dec. 31, 2010
item
IMPAIRMENT      
Occupancy percentage of Park West property 68.20% 64.90%  
Area of lease (in squarefeet) 18,500    
Increased occupancy percentage 75.60%    
Impairment      
Number of additional regions or projects for which additional provisions for impairment were not considered necessary     4
Number of additional operating properties for which additional provisions for impairment were not considered necessary     4
Impaired Asset, Total Loss     $ 503,356,000
Share of the entity in impairment charges recorded by real estate affiliates     0
Discount rate     20.00%
Total Fair Value Measurement
     
Impairment      
Impaired Asset     291,639,000
Master Planned Communities
     
Impairment      
Impairment charges on investment in real estate     405,331,000
Master Planned Communities | Total Fair Value Measurement
     
Impairment      
Impaired Asset     239,797,000
Master Planned Communities | Maryland - Gateway
     
Impairment      
Impairment charges on investment in real estate     2,613,000
Master Planned Communities | Maryland - Gateway | Total Fair Value Measurement
     
Impairment      
Impaired Asset     1,649,000
Master Planned Communities | Maryland - Columbia
     
Impairment      
Impairment charges on investment in real estate     56,798,000
Master Planned Communities | Maryland - Columbia | Total Fair Value Measurement
     
Impairment      
Impaired Asset     34,823,000
Master Planned Communities | Summerlin South
     
Impairment      
Impairment charges on investment in real estate     345,920,000
Master Planned Communities | Summerlin South | Total Fair Value Measurement
     
Impairment      
Impaired Asset     203,325,000
Operating Assets
     
Impairment      
Impairment charges on investment in real estate     80,923,000
Impairment charges for pre-development costs     514,000
Operating Assets | Total Fair Value Measurement
     
Impairment      
Impaired Asset     33,929,000
Operating Assets | Landmark Mall
     
Impairment      
Impairment charges on investment in real estate     24,434,000
Operating Assets | Landmark Mall | Total Fair Value Measurement
     
Impairment      
Impaired Asset     23,750,000
Operating Assets | Riverwalk Marketplace
     
Impairment      
Impairment charges on investment in real estate     55,975,000
Operating Assets | Riverwalk Marketplace | Total Fair Value Measurement
     
Impairment      
Impaired Asset     10,179,000
Residual capitalization rate (as a percent)     8.50%
Strategic Developments
     
Impairment      
Impairment charges on investment in real estate     17,102,000
Impairment charges for pre-development costs     68,000
Strategic Developments | Total Fair Value Measurement
     
Impairment      
Impaired Asset     17,913,000
Strategic Developments | Century Plaza Mall
     
Impairment      
Impairment charges on investment in real estate     12,899,000
Strategic Developments | Century Plaza Mall | Total Fair Value Measurement
     
Impairment      
Impaired Asset     4,500,000
Strategic Developments | Nouvelle at Natick
     
Impairment      
Impairment charges on investment in real estate     4,135,000
Strategic Developments | Nouvelle at Natick | Total Fair Value Measurement
     
Impairment      
Impaired Asset     $ 13,413,000