Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (RiverPark At Harrison I, L.L.C.) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (RiverPark At Harrison I, L.L.C.) (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Oct. 23, 2012
RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Percentage of interest in venture   36.00%
Holding and distribution pattern under operating agreement In general, the operating agreement of Riverpark provides, among other things, for the distribution of net cash flow to the members in accordance with their ownership percentages.  
RiverPark At Harrison I, L.L.C. [Member] | Chall Enterprises, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Third party ownership percentage 36.00%  
RiverPark At Harrison I, L.L.C. [Member] | Investor Group [Member]
    
Schedule of Equity Method Investments [Line Items]    
Third party ownership percentage 28.00%  
Riverpark Project [Member]
    
Schedule of Equity Method Investments [Line Items]    
Percentage of capital required to fund project 40.50%  
Riverpark Project [Member] | RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Number of units   141
Total project costs $ 27,900,000  
Construction Loan [Member] | RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity 23,400,000  
Amount outstanding 3,400,000  
Spread over LIBOR 2.35%  
Loan maturity date Jun. 01, 2016  
Number of extension options 2  
Loan extension period 1 year  
Percentage of debt guaranteed by the company 25.00%  
Percentage of debt guaranteed by company after project completion and achievement of financial ratios 10.00%  
Threshold of payment guarantee, debt service coverage ratio 1.30  
Threshold of payment guarantee, loan-to-value ratio 65.00%  
Construction Loan [Member] | Riverpark Project [Member] | RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Maximum borrowing capacity 23,400,000  
Construction Loan Extension Number 1 [Member] | RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Extension fee 0.20%  
Construction Loan Extension Number 2 [Member] | RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Extension fee 0.20%  
Land [Member] | Riverpark Project [Member] | RiverPark At Harrison I, L.L.C. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Capital balance $ 8,000,000