Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)

v3.3.1.900
Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)
12 Months Ended
Aug. 15, 2014
property
Sep. 03, 2013
USD ($)
Jul. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
ft²
$ / item
property
item
Dec. 31, 2014
USD ($)
property
Dec. 31, 2013
USD ($)
Aug. 28, 2015
USD ($)
ft²
Aug. 27, 2015
USD ($)
Jul. 14, 2015
USD ($)
item
Jun. 01, 2015
item
Schedule of Equity Method Investments [Line Items]                    
Carrying Amount       $ 303,457,000 $ 247,468,000          
Property Debt, Balance       1,840,668,000            
Amount outstanding       155,000,000 0          
Accounts payable, accrued expenses and other liabilities       135,057,000 126,971,000          
Sales proceeds       148,256,000 319,239,000 $ 390,600,000        
Collection of notes receivable       $ 8,250,000 62,526,000 $ 333,000        
Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Company's Effective Ownership %       7.50%            
Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Company's Effective Ownership %       85.00%            
Marbella RoseGarden, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       412            
Company's Effective Ownership % [1],[2]       24.27%            
Carrying Amount [1]       $ 15,569,000 15,779,000          
Property Debt, Balance [1]       $ 95,000,000            
Property Debt, Maturity Date [1]       May 01, 2018            
Property Debt, Interest Rate [1]       4.99%            
RoseGarden Monaco Holdings, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       523            
Company's Effective Ownership % [1],[2]       15.00%            
Carrying Amount [1]       $ 937,000 2,161,000          
Property Debt, Balance [1]       $ 165,000,000            
Property Debt, Maturity Date [1]       Feb. 01, 2021            
Property Debt, Interest Rate [1]       4.19%            
Rosewood Lafayette Holdings, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       217 [3]           217
Company's Effective Ownership %       25.00% [2],[3]           25.00%
Carrying Amount [3]         62,000          
PruRose Port Imperial South 15, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       236            
Company's Effective Ownership % [1],[2]       50.00%            
Property Debt, Balance [1]       $ 57,500,000            
Property Debt, Maturity Date [1]       Sep. 01, 2020            
Property Debt, Interest Rate [1]       4.32%            
Rosewood Morristown, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [4],[5],[6]       130            
Company's Effective Ownership % [2],[4],[5],[6]       12.50%            
Carrying Amount [4],[5],[6]       $ 5,723,000 6,029,000          
Property Debt, Balance [4],[5],[6]       45,982,000            
Note payable       $ 975,000            
Overlook Ridge JV 2C/3B, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       371            
Company's Effective Ownership % [1],[2]       50.00%            
Carrying Amount [1]       $ 2,039,000 2,524,000          
Property Debt, Balance [1]       $ 52,662,000            
Property Debt, Maturity Date [1]       Jan. 26, 2016            
Property Debt, Interest Rate, LIBOR [1],[7]       L+2.50            
Property Debt, Interest Rate, Spread Over LIBOR [1],[7]       2.50%            
Overlook Ridge JV 2C/3B, L.L.C. [Member] | Construction Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate       3.0875%            
Number of extension options | item       2            
Loan extension period       1 year            
Extension fee       25.00%            
Maximum borrowing capacity       $ 55,500,000            
Notional amount   $ 1,840,000   $ 52,000,000            
PruRose Riverwalk G, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       316            
Company's Effective Ownership % [1],[2]       25.00%            
Carrying Amount [1]         955,000          
Property Debt, Balance [1]       $ 79,393,000            
Property Debt, Maturity Date [1]       Jul. 15, 2021            
Property Debt, Interest Rate [1],[8]       6.00%            
PruRose Riverwalk G, L.L.C. [Member] | Permanent Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Maximum borrowing capacity       $ 80,249,000            
Elmajo Urban Renewal Associates, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       355            
Company's Effective Ownership % [1],[2]       7.50%            
Property Debt, Balance [1]       $ 128,100,000            
Property Debt, Maturity Date [1]       Mar. 01, 1930            
Property Debt, Interest Rate, LIBOR [1],[9]       4.00            
Elmajo Urban Renewal Associates, L.L.C. [Member] | Permanent Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Maximum borrowing capacity       $ 91,000,000            
Crystal House Apartments Investors LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [10]       798            
Company's Effective Ownership % [2],[10]       25.00%            
Carrying Amount [10]       $ 28,114,000 27,051,000          
Property Debt, Balance [10]       $ 165,000,000            
Property Debt, Maturity Date [10]       Apr. 01, 2020            
Property Debt, Interest Rate [10]       3.17%            
Percentage of interest in developable land       50.00%            
Number of units available for development | $ / item       295            
Number of approved units available for development | item       252            
Portside Master Company, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       176            
Company's Effective Ownership % [1],[2]       38.25%            
Carrying Amount [1]         1,747,000          
Property Debt, Balance [1]       $ 42,500,000            
Property Debt, Maturity Date [1]       Dec. 04, 2017            
Property Debt, Interest Rate, LIBOR [1],[11]       L+2.50            
Property Debt, Interest Rate, Spread Over LIBOR [1],[11]       2.50%            
Portside Master Company, L.L.C. [Member] | Construction Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of extension options | item       2            
Maximum borrowing capacity       $ 42,500,000            
Portside Master Company, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Loan extension period       2 years            
Extension fee       0.125%            
Portside Master Company, L.L.C. [Member] | Construction Loan Extension Number 2 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Loan extension period       2 years            
Extension fee       0.25%            
PruRose Port Imperial South 13, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       280            
Company's Effective Ownership % [1],[2]       20.00%            
Carrying Amount [1]         1,087,000          
Property Debt, Balance [1]       $ 70,386,000            
Property Debt, Maturity Date [1]       Jun. 27, 2016            
Property Debt, Interest Rate, LIBOR [1],[12]       L+2.15            
Property Debt, Interest Rate, Spread Over LIBOR [1],[12]       2.15%            
PruRose Port Imperial South 13, L.L.C. [Member] | Construction Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate       2.79%            
Maximum borrowing capacity       $ 73,350,000            
Notional amount     $ 1,620,000 $ 69,500,000            
PruRose Port Imperial South 13, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Loan extension period       1 year            
Extension fee       0.25%            
PruRose Port Imperial South 13, L.L.C. [Member] | Construction Loan Extension Number 2 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Loan extension period       6 months            
Extension fee       0.25%            
Roseland/Port Imperial Partners, L.P. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1],[13]       363            
Company's Effective Ownership % [1],[2],[13]       20.00%            
Carrying Amount [1],[13]       $ 1,678,000 1,800,000          
RoseGarden Marbella South, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       311            
Company's Effective Ownership % [2]       24.27%            
Carrying Amount       $ 16,728,000 11,282,000          
Property Debt, Balance       $ 68,046,000            
Property Debt, Maturity Date       Mar. 30, 2017            
Property Debt, Interest Rate, LIBOR [14]       L+2.25            
Property Debt, Interest Rate, Spread Over LIBOR [14]       2.25%            
RoseGarden Marbella South, L.L.C. [Member] | Construction Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of extension options | item       2            
Loan extension period       1 year            
Extension fee       0.25%            
Maximum borrowing capacity       $ 77,400,000            
Estuary Urban Renewal Unit B, LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [1]       227            
Company's Effective Ownership % [1],[2]       7.50%            
Property Debt, Balance [1]       $ 81,900,000            
Property Debt, Maturity Date [1]       Mar. 01, 1930            
Property Debt, Interest Rate, LIBOR [1],[15]       4.00            
Estuary Urban Renewal Unit B, LLC [Member] | Permanent Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Maximum borrowing capacity       $ 57,000,000            
RiverPark At Harrison I, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       141 [3]         141  
Company's Effective Ownership %       45.00% [2],[3]         36.00%  
Carrying Amount [3]       $ 2,544,000 4,744,000          
Property Debt, Balance       $ 30,000,000 [3]         $ 30,000,000  
Property Debt, Maturity Date [3]       Aug. 01, 2025            
Property Debt, Interest Rate, LIBOR [3],[16]       3.70            
RiverPark At Harrison I, L.L.C. [Member] | Permanent Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Maximum borrowing capacity       $ 23,400,000            
Capitol Place Mezz LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       378            
Company's Effective Ownership % [2]       50.00%            
Carrying Amount       $ 46,267,000 49,327,000          
Property Debt, Balance       $ 100,700,000            
Property Debt, Maturity Date       Jul. 01, 2033            
Property Debt, Interest Rate [17]       4.82%            
Capitol Place Mezz LLC [Member] | Construction/Permanent Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Maximum borrowing capacity       $ 100,700,000            
Harborside Unit A Urban Renewal, LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       763            
Company's Effective Ownership % [2]       85.00%            
Carrying Amount       $ 96,799,000 34,954,000          
Property Debt, Balance       $ 63,871,000            
Property Debt, Maturity Date       Aug. 01, 2029            
Property Debt, Interest Rate [18]       5.197%            
Harborside Unit A Urban Renewal, LLC [Member] | Construction/Permanent Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Maximum borrowing capacity       $ 192,000,000            
RoseGarden Monaco, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       250            
Company's Effective Ownership % [2]       41.67%            
Carrying Amount       $ 1,339,000 1,283,000          
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       850            
Company's Effective Ownership % [2]       50.00%            
Carrying Amount       $ 337,000 337,000          
Red Bank Corporate Plaza, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       92,878            
Company's Effective Ownership % [2]       50.00%            
Carrying Amount       $ 4,140,000 3,963,000          
Property Debt, Balance       $ 15,124,000            
Property Debt, Maturity Date       May 17, 2016            
Property Debt, Interest Rate       3.99375%            
Property Debt, Interest Rate, LIBOR [19]       L+3.00            
Property Debt, Interest Rate, Spread Over LIBOR [19]       3.00%            
Notional amount       $ 13,650,000            
12 Vreeland Associates, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       139,750            
Company's Effective Ownership % [2]       50.00%            
Carrying Amount       $ 5,890,000 5,620,000          
Property Debt, Balance       $ 12,543,000            
Property Debt, Maturity Date       Jul. 01, 2023            
Property Debt, Interest Rate       2.87%            
BNES Associates III [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       106,345            
Company's Effective Ownership % [2]       31.25%            
Carrying Amount       $ 2,295,000 1,993,000          
Property Debt, Balance       $ 6,133,000            
Property Debt, Maturity Date       Nov. 01, 2023            
Property Debt, Interest Rate       4.76%            
Hillsborough 206 Holdings, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       160,000            
Company's Effective Ownership % [2]       50.00%            
Carrying Amount       $ 1,962,000 1,962,000          
KPG-P 100 IMW JV, LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       339,615            
Company's Effective Ownership % [2]       33.33%            
Property Debt, Balance       $ 61,500,000            
Property Debt, Maturity Date       Sep. 09, 2016            
Property Debt, Interest Rate, LIBOR [20]       L+7.00            
Property Debt, Interest Rate, Spread Over LIBOR [20]       7.00%            
Number of extension options | item       2            
Loan extension period       1 year            
Keystone-Penn [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       1,842,820 [3]     236,417      
Company's Effective Ownership % [2],[3],[21]                  
Carrying Amount       $ 0            
Property Debt, Balance       227,111,000 [3],[22]     $ 45,500,000 $ 31,800,000    
Keystone-Penn [Member] | Principal Balance Due August 27, 2023 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 127,600,000            
Property Debt, Maturity Date       Aug. 27, 2023            
Property Debt, Interest Rate       5.114%            
Keystone-Penn [Member] | Principal Balance Due September 6, 2026 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 45,500,000            
Property Debt, Maturity Date       Sep. 06, 2025            
Property Debt, Interest Rate       5.01%            
Keystone-Penn [Member] | Principal Balance Due August 27, 2016 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 32,336,000            
Property Debt, Maturity Date       Aug. 27, 2016            
Keystone-Penn [Member] | Principal Balance Due August 27, 2016 [Member] | Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate, Spread Over LIBOR       5.00%            
Keystone-Penn [Member] | Principal Balance Due August 27, 2016 [Member] | Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate, Spread Over LIBOR       5.75%            
Keystone-Penn [Member] | Principal Balance Due January 9, 2019 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 11,250,000            
Property Debt, Maturity Date       Jan. 09, 2019            
Property Debt, Interest Rate, Spread Over LIBOR       5.50%            
Keystone-Penn [Member] | Principal Balance Due August 31, 2016 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 10,425,000            
Property Debt, Maturity Date       Aug. 31, 2016            
Property Debt, Interest Rate, Spread Over LIBOR       6.00%            
Keystone-Penn [Member] | Keystone Property Group [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Internal rate of return       15.00%            
Keystone-Penn [Member] | Parent Company [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Internal rate of return       10.00%            
Keystone-TriState [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       1,266,384            
Company's Effective Ownership % [2],[23]                  
Carrying Amount       $ 3,958,000 6,140,000          
Property Debt, Balance [24]       $ 208,476,000            
Property Debt, Interest Rate       4.88%            
Capital balance in properties in which senior pari passu interest is held       $ 4,000,000            
Number of properties with senior pari passu interest | property       5            
Keystone-TriState [Member] | Principal Balance Due July 1, 2017 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 42,107,000            
Property Debt, Maturity Date       Jul. 01, 2017            
Property Debt, Interest Rate       4.95%            
Keystone-TriState [Member] | Principal Balance Due September 9, 2017 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 73,670,000            
Property Debt, Maturity Date       Sep. 09, 2017            
Keystone-TriState [Member] | Principal Balance Due September 9, 2017 [Member] | Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate       5.65%            
Keystone-TriState [Member] | Principal Balance Due September 9, 2017 [Member] | Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate       6.75%            
Keystone-TriState [Member] | Principal Balance Due July 6, 2024 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 14,250,000            
Property Debt, Maturity Date       Jul. 06, 2024            
Keystone-TriState [Member] | Principal Balance Due July 6, 2044 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 63,400,000            
Property Debt, Maturity Date       Jul. 06, 2044            
Property Debt, Interest Rate       4.93%            
Keystone-TriState [Member] | Principal Balance Due August 6, 2044 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 15,050,000            
Property Debt, Maturity Date       Aug. 06, 2044            
Property Debt, Interest Rate       4.71%            
Keystone-TriState [Member] | Keystone Property Group [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Internal rate of return       15.00%            
Keystone-TriState [Member] | Parent Company [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Internal rate of return       10.00%            
KPG-MCG Curtis JV, LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft² [25],[26]       885,000            
Company's Effective Ownership % [2],[25],[26]       50.00%            
Carrying Amount [25],[26]       $ 59,858,000 59,911,000          
Plaza VIII & IX Associates, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       1,225,000            
Company's Effective Ownership % [2]       50.00%            
Carrying Amount       $ 4,055,000 4,022,000          
Roseland/North Retail, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft² [1]       30,745            
Company's Effective Ownership % [1],[2]       20.00%            
Carrying Amount [1]       $ 1,758,000 1,828,000          
South Pier At Harborside [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item [27],[28]       350            
Company's Effective Ownership % [2],[27],[28]       50.00%            
Property Debt, Balance [27],[28]       $ 63,741,000            
Accounts payable, accrued expenses and other liabilities       3,317,000 1,854,000          
Letter of credit       3,600,000            
South Pier At Harborside [Member] | Variable Rate Loan Due August 1, 2020 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 3,594,000            
Property Debt, Maturity Date       Aug. 01, 2020            
Letter of credit       $ 3,600,000            
South Pier At Harborside [Member] | Variable Rate Loan Due August 1, 2020 [Member] | Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate       6.09%            
South Pier At Harborside [Member] | Variable Rate Loan Due August 1, 2020 [Member] | Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate       6.62%            
Stamford SM LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Company's Effective Ownership % [2],[29]       80.00%            
Stamford SM LLC [Member] | Mezz Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Collection of notes receivable       $ 47,200,000            
Stamford SM LLC [Member] | Parent Company [Member] | Mezz Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Collection of notes receivable       37,800,000            
Other [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Carrying Amount [30]       $ 1,467,000 907,000          
The Shops At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Square feet | ft²       50,973            
Residual ownership interest       12.50%            
Additional borrowing capacity       $ 1,000,000            
The Shops At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member] | Amortization Loan [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 6,455,000            
Property Debt, Maturity Date       Aug. 01, 2018            
Property Debt, Interest Rate       3.63%            
Lofts At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       59            
Property Debt, Balance       $ 1,117,000            
Property Debt, Maturity Date       Sep. 01, 2016            
Property Debt, Interest Rate, Spread Over LIBOR       2.50%            
Indirect ownership interest       25.00%            
Number of stories | item       5            
Metropolitan Property [Member] | Rosewood Morristown, L.L.C. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 38,410,000            
Property Debt, Maturity Date       Sep. 01, 2020            
Property Debt, Interest Rate       3.25%            
Port Imperial North Land [Member] | Roseland/Port Imperial Partners, L.P. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       836            
Residual ownership interest       20.00%            
Hotel [Member] | South Pier At Harborside [Member] | 6.15% Mortgage Loan Due November 2016 [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Balance       $ 60,147,000            
Property Debt, Maturity Date       Nov. 01, 2016            
Property Debt, Interest Rate       6.15%            
Multi-Family Properties [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of apartments | item       5,644            
Overlook Ridge Properties [Member] | Consolidated Land [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of interest in developable land 100.00%                  
Overlook Ridge Properties [Member] | Consolidated Land [Member] | Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate, Spread Over LIBOR 2.50%                  
Overlook Ridge Properties [Member] | Consolidated Land [Member] | Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property Debt, Interest Rate, Spread Over LIBOR 3.50%                  
Overlook Ridge Properties [Member] | Multi-Family Properties [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Indirect ownership interest 50.00%                  
Number of properties in which additional interest was acquired during period | property 2                  
Keystone Portfolio [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Capital balance in properties in which senior pari passu interest is held         $ 7,300,000          
Number of properties with senior pari passu interest | property         5          
Sales proceeds         $ 196,800,000          
Keystone Portfolio [Member] | Parent Company [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Internal rate of return       10.00%            
Keystone Portfolio [Member] | Keystone Entities [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Internal rate of return       15.00%            
[1] The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term.
[2] Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[3] See discussion in Recent Transactions following in this footnote.
[4] Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,410, bears interest at 3.25 percent, matures in September 2020; (ii) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $6,455, bears interest at 3.63 percent, matures in August 2018; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117, bears interest at LIBOR plus 250 basis points and matures in September 2016. The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved.
[5] The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the payment of the outstanding balance remaining on a note ($975 as of December 31, 2015), and is not expected to meaningfully participate in the venture's cash flows in the near term.
[6] Through the joint venture, the Company also owns a 12.5 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 25 percent interest in a to-be-built 59-unit, five story multi-family rental development property ("Lofts at 40 Park
[7] The construction loan has a maximum borrowing amount of $55,500 and provides, subject to certain conditions, two one-year extension options with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 3.0875 percent per annum on an initial notional amount of $1,840, increasing to $52,000, for the period from September 3, 2013 to November 2, 2015.
[8] The permanent loan has a maximum borrowing amount of $80,249.
[9] The construction loan with a maximum borrowing amount of $91,000 converted to a permanent loan on February 27, 2015.
[10] The Company also owns a 50 percent interest in a vacant land to accommodate the development of approximately 295 additional units of which 252 are currently approved.
[11] The construction loan has a maximum borrowing amount of $42,500 and provides, subject to certain conditions, two two-year extension options with a fee of 12.5 basis points for the first two-year extension and 25 basis points for the second two-year extension.
[12] The construction loan has a maximum borrowing amount of $73,350 and provides, subject to certain conditions, one-year extension option followed by a six-month extension option with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 2.79 percent per annum on an initial notional amount of $1,620, increasing to $69,500 for the period from July 1, 2013 to January 1, 2016.
[13] The Company also owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J ("Port Imperial North Land") that can accommodate the development of 836 apartment units.
[14] The construction loan has a maximum borrowing amount of $77,400 and provides, subject to certain conditions, two one-year extension options with a fee of 25 basis points for each year.
[15] The construction loan with a maximum borrowing amount of $57,000 converted to a permanent loan on February 27, 2015.
[16] The construction loan with a maximum borrowing amount of $23,400 converted to a permanent loan on July 14, 2015. See discussion in Recent Transactions following in this footnote.
[17] The construction/permanent loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017.
[18] The construction/permanent loan has a maximum borrowing amount of $192,000.
[19] The joint venture has a swap agreement that fixes the all-in rate to 3.99375 percent per annum on an initial notional amount of $13,650 and then adjusting in accordance with an amortization schedule, which is effective from October 17, 2011 through loan maturity.
[20] The mortgage loan has two one-year extension options, subject to certain conditions.
[21] The Company's equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return ("IRR") after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally. See discussion in Recent Transactions following in this footnote.
[22] Principal balance of $127,600 bears interest at 5.114 percent and matures on August 27, 2023; principal balance of $45,500 bears interest at 5.01 percent and matures on September 6, 2025; principal balance of $32,336 bears interest at rates ranging from LIBOR+5.0 percent to LIBOR+5.75 percent and matures on August 27, 2016; principal balance of $11,250 bears interest at LIBOR+5.5 percent and matures on January 9, 2019; principal balance of $10,425 bears interest at LIBOR+6.0 percent matures on August 31, 2016.
[23] Includes the Company's pari-passu interests of $4.0 million in five properties and Company's subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return ("IRR") after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally.
[24] Principal balance of $42,107 bears interest at 4.95 percent and matures on July 1, 2017; principal balance of $73,670 bears interest at rates ranging from 5.65 percent to 6.75 percent and matures on September 9, 2017; principal balance of $14,250 bears interest at 4.88 percent and matures on July 6, 2024; principal balance of $63,400 bears interest at 4.93 percent and matures on July 6, 2044; principal balance of $15,050 bears interest at 4.71 percent and matures on August 6, 2044.
[25] Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12.
[26] See Note 10: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.
[27] Balance includes: (i) mortgage loan, collateralized by the hotel property, with a balance of $60,147, bears interest at 6.15 percent and matures in November 2016, and (ii) loan with a balance of $3,594, bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020. The Company posted a $3.6 million letter of credit in support of this loan, half of which is indemnified by the partner.
[28] The negative carrying value for this venture of $3,317 and $1,854 as of December 31, 2015 and 2014, respectively, were included in accounts payable, accrued expenses and other liabilities.
[29] The joint venture collected net proceeds of $47.2 million at maturity, of which the Company received its share of $37.8 million on August 6, 2014.
[30] The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term.