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Investments in Unconsolidated Affiliated Real Estate Entities (Additional Information) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Mar. 31, 2010
Schedule of Equity Method Investments [Line Items]          
Total investments in unconsolidated affiliated real estate entities $ 15,122 $ 14,780      
1407 Broadway Mezz II, LLC [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 49.00%     49.00%  
Total investments in unconsolidated affiliated real estate entities           
Line of credit facility, maximum borrowing capacity         20,000
Line of credit facility, aggregate loan proceeds     1,500    
Line of credit facility, principal paid   1,000      
Line of credit facility, amount outstanding   500      
Loan amount converted to a distribution payable 500        
Grand Prairie Holdings LLC [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 40.00%        
Total investments in unconsolidated affiliated real estate entities 5,325 5,297      
Grand Prairie Holdings LLC [Member] | An affiliate of the Company's Sponsor [Member]
         
Schedule of Equity Method Investments [Line Items]          
Ownership interest 60.00%        
Grand Prairie Holdings LLC [Member] | Operating Partnership [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 25.00%        
Grand Prairie Holdings LLC [Member] | Pro-DFJV Holdings LLC [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 15.00%        
Grand Prairie Holdings LLC [Member] | Grand Prairie Outlet Center [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 50.00%        
Area of real estate space 418,000        
Grand Prairie Holdings LLC [Member] | Land [Member]
         
Schedule of Equity Method Investments [Line Items]          
Ownership interest 100.00%        
Livermore Valley Holdings, LLC [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 40.00%        
Total investments in unconsolidated affiliated real estate entities   9,483      
Livermore Valley Holdings, LLC [Member] | An affiliate of the Company's Sponsor [Member]
         
Schedule of Equity Method Investments [Line Items]          
Ownership interest 60.00%        
Livermore Valley Holdings, LLC [Member] | Operating Partnership [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 25.00%        
Livermore Valley Holdings, LLC [Member] | Pro-DFJV Holdings LLC [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 15.00%        
Livermore Valley Holdings, LLC [Member] | Land [Member]
         
Schedule of Equity Method Investments [Line Items]          
Ownership interest 100.00%        
Livermore Valley Holdings, LLC [Member] | Livermore Valley Outlet Center [Member]
         
Schedule of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 50.00%        
Area of real estate space 511,000        
Broadway [Member]
         
Schedule of Equity Method Investments [Line Items]          
Total investments in unconsolidated affiliated real estate entities       0