Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (PruRose Riverwalk G, L.L.C.) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (PruRose Riverwalk G, L.L.C.) (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Oct. 23, 2012
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Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity 600,000,000  
West New York Parcel G Apartments Investors, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Total project costs 118,100,000  
Percentage of capital event cash flows distributed 100.00%  
Internal rate of return 7.75%  
Riverwalk G Urban Renewal, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Percentage of operating return on capital 7.75%  
Development management and other services fees 175,000  
Prudential [Member]
    
Schedule of Equity Method Investments [Line Items]    
Capital balance 14,700,000  
Amount of company's initial distributions to be redirected 1,300,000  
PruRose Riverwalk G, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Indirect residual ownership percentage   25.00%
Number of stories   12
Number of units   316
Percentage of interest in venture   50.00%
Holding and distribution pattern under operating agreement In general, the operating agreement of Riverwalk G provides that operating cash flows are distributed to members first to Investor and then to PruRose Riverwalk based on a 7.75 percent operating return on each members' capital balance in priorities as detailed in the operating agreement. Excess operating cash flows are distributed to the members in accordance with their ownership percentages.  
PruRose Riverwalk G, L.L.C. [Member] | West New York Parcel G Apartments Investors, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Capital balance 35,000,000  
Accumulated unpaid operating return 4,500,000  
PruRose Riverwalk G's Interest In Riverwalk G Urban Renewal [Member]
    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage   50.00%
Construction Loan [Member] | West New York Parcel G Apartments Investors, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity 83,100,000  
Construction Loan [Member] | Riverwalk G Urban Renewal, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity 83,100,000  
Amount outstanding 30,700,000  
Interest rate 6.00%  
Loan maturity date Jul. 01, 2021  
Period of loan guarantee by company following completion of project 6 months  
RiverTrace Project [Member] | West New York Parcel G Apartments Investors, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Total project costs 35,000,000