Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (PruRose Port Imperial South 15, L.L.C) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (PruRose Port Imperial South 15, L.L.C) (Narrative) (Details) (PruRose Port Imperial South 15, L.L.C. [Member], USD $)
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
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Oct. 23, 2012
sqft
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Mar. 31, 2013
Prudential-Port [Member]
Mar. 31, 2013
Mortgage Loan Extension Number 1 [Member]
Dec. 31, 2012
Mortgage Loan Extension Number 2 [Member]
Schedule of Equity Method Investments [Line Items]          
Percentage of interest in venture   50.00%      
Number of units   236      
Area of property (in square feet)   214,402      
Third party ownership percentage   50.00%      
Percentage of operating return on capital 9.00%        
Capital balance     $ 33,300,000    
Accumulated unpaid operating return     3,900,000    
Percent of distributions paid to third party after threshold reached 20.00%        
Threshold of internal rate of return for distributions to third party 8.00%        
Mortgage loans, carrying amount 57,000,000        
Spread over LIBOR 2.35%        
Mortgage loan, maturity date June 2013        
Number of extension options 2        
Loan extension period 1 year        
Extension fee       0.25% 0.25%
Interest rate 3.78%        
Management, leasing and other services fees $ 61,000        
Holding and distribution pattern under operating agreement In general, the operating agreement of Port Imperial 15 provides that operating cash flows are distributed to members first to Prudential-Port and then to the Company based on a nine 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.