Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
May 26, 2016
USD ($)
item
Apr. 01, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
USD ($)
Real Estate Properties [Line Items]            
Purchase price of property         $ 94,017 $ 59,700
Gain on sale of investment in unconsolidated joint venture         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         5,214  
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  
PruRose Port Imperial South 15, L.L.C. [Member]            
Real Estate Properties [Line Items]            
Number of units | item 236          
Percentage of interest in venture 50.00%          
PruRose Port Imperial South 13, L.L.C. [Member]            
Real Estate Properties [Line Items]            
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 venture $ 5,700          
Proceeds from the sale of investments in unconsolidated joint ventures $ 6,400