Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details)

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Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
May 26, 2016
USD ($)
item
Apr. 01, 2016
USD ($)
Jun. 30, 2016
USD ($)
item
Mar. 31, 2016
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
Real Estate Properties [Line Items]              
Purchase price of property           $ 51,638 $ 42,881
Gain on sale of investment in unconsolidated joint ventures     $ 5,670   $ 6,448 5,670 6,448
Proceeds from the sale of investments in unconsolidated joint ventures           $ 6,420 $ 6,448
Multi-Family Properties [Member]              
Real Estate Properties [Line Items]              
Number of units | item     5,434     5,434  
PruRose Riverwalk G, L.L.C. [Member]              
Real Estate Properties [Line Items]              
Purchase price of property   $ 11,300 $ 11,300        
Percentage of additional interest acquired   50.00%   25.00%      
Number of units | item     316     316  
PruRose Port Imperial South 15, L.L.C. [Member]              
Real Estate Properties [Line Items]              
Number of units | item 236   236 [1]     236 [1]  
Percentage of interest in venture 50.00%            
PruRose Port Imperial South 13, L.L.C. [Member]              
Real Estate Properties [Line Items]              
Number of units | item [1]     280     280  
Percentage of interest in venture 20.00%            
PruRose Port Imperial South 13, L.L.C. [Member] | Multi-Family Properties [Member]              
Real Estate Properties [Line Items]              
Number of units | item 280            
Pru Rose Port Imperial South 15 L.L.C. And Pru Rose Port Imperial South 13 L.L.C. [Member]              
Real Estate Properties [Line Items]              
Gain on sale of investment in unconsolidated joint ventures $ 5,700            
Proceeds from the sale of investments in unconsolidated joint ventures $ 6,400            
[1] See discussion in Note 3: Recent Transactions - Unconsolidated Joint Venture Activity.