Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Narrative) (Details)
 3 Months Ended 9 Months Ended
Jul. 14, 2015
USD ($)
item
Jun. 01, 2015
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May. 13, 2015
USD ($)
item
Jan. 15, 2015
USD ($)
Sep. 30, 2015
USD ($)
ft²
property
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Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
ft²
property
item
Sep. 30, 2014
USD ($)
Aug. 28, 2015
USD ($)
ft²
Aug. 27, 2015
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Jul. 15, 2015
Apr. 01, 2015
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Dec. 31, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]                          
Company's investments in unconsolidated joint ventures, net         $ 299,486,000   $ 299,486,000           $ 247,468,000
Amount outstanding         35,000,000   35,000,000            
Management, leasing, development and other services fees         1,300,000 $ 1,900,000 4,400,000 $ 5,100,000          
Accounts receivable due from unconsolidated joint ventures         700,000   700,000           1,000,000
Maximum exposure to loss         202,100,000   202,100,000            
Estimated future funding commitments         33,700,000   33,700,000            
Realized gains on dispositions, net         18,718,000 $ 264,000 53,261,000 54,848,000          
Mortgage loan         $ 1,784,744,000   1,784,744,000            
Proceeds from mortgages and loans payable             $ 6,193,000 $ 28,350,000          
Unconsolidated Joint Venture Office Buildings [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of properties | property         36   36            
Unconsolidated Joint Venture Office And Retail Buildings [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Area of property (in square feet) | ft²         5,700,000   5,700,000            
Unconsolidated Joint Venture Retail Buildings [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of properties | property         2   2            
Unconsolidated Joint Venture Multi-Family Properties [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of properties | property         13   13            
Number of units | item         4,343   4,343            
Unconsolidated Joint Venture Hotel [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of units | item         350   350            
Unconsolidated Joint Venture Development Projects [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of units | item         1,074   1,074            
Unconsolidated Joint Venture Land Parcels [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of units | item         2,910   2,910            
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Maximum borrowing capacity         $ 453,600,000   $ 453,600,000            
Amount outstanding         268,300,000   268,300,000            
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Maximum borrowing capacity         62,000,000   62,000,000            
Amount outstanding         $ 53,100,000   $ 53,100,000            
Minimum [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Percentage of interest in venture         7.50%   7.50%            
Maximum [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Percentage of interest in venture         85.00%   85.00%            
Variable Interest Entity [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Company's investments in unconsolidated joint ventures, net         $ 168,400,000   $ 168,400,000            
Number of VIEs | property         5   5            
Office [Member] | Unconsolidated Joint Venture Land Parcels [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Area of property (in square feet) | ft²         1,400,000   1,400,000            
South Pier At Harborside [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Company's investments in unconsolidated joint ventures, net [1]                      
Number of units | item         350   350            
Percentage of interest in venture [2]         50.00%   50.00%            
Letter of credit         $ 3,600,000   $ 3,600,000            
Mortgage loan         $ 64,092,000   $ 64,092,000            
Keystone-Penn [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Area of property (in square feet) | ft²         1,842,820   1,842,820   236,417        
Percentage of interest in venture [2],[3]                      
Mortgage loan         $ 223,546,000   $ 223,546,000   $ 45,500,000 $ 31,800,000      
Proceeds from mortgages and loans payable             3,700,000            
RiverPark At Harrison I, L.L.C. [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Company's investments in unconsolidated joint ventures, net         $ 2,575,000   $ 2,575,000           4,744,000
Number of units | item 141       141   141            
Percentage of interest in venture 36.00%       45.00% [2]   45.00% [2]       45.00%    
Proceeds from loans $ 1,700,000                        
Mortgage loan 30,000,000       $ 30,000,000   $ 30,000,000            
RiverPark At Harrison I, L.L.C. [Member] | Construction Loan [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Maximum borrowing capacity         $ 23,400,000   $ 23,400,000            
Mortgage loan $ 23,400,000                        
RiverPark At Harrison I, L.L.C. [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Percentage of interest in venture 44.00%                        
Percentage of additional interest acquired 20.00%                        
Third party ownership percentage                     55.00%    
Capital balance $ 2,100,000                        
Rosewood Lafayette Holdings, L.L.C. [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Company's investments in unconsolidated joint ventures, net [4]                         $ 62,000
Number of units | item   217     217 [4]   217 [4]            
Percentage of interest in venture   25.00%     25.00% [2],[4]   25.00% [2],[4]            
Realized gains on dispositions, net   $ 6,400,000                      
Overlook Ridge JV, L.L.C. [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of units | item     251                    
Percentage of interest in venture     50.00%                    
Amount sold     $ 74,600,000                    
Distributed cash received from sale     0                    
Realized gains on dispositions, net     $ 0                    
City Square Project [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of units | item                       365  
City Square Project Phase One [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Number of units | item         237   237            
1451 Metropolitan Drive [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Realized gains on dispositions, net       $ 100,000                  
[1] The negative carrying value for this venture of $1,419 and $1,854 as of September 30, 2015 and December 31, 2014, respectively, were included in accounts payable, accrued expenses and other liabilities.
[2] Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[3] 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.
[4] See discussion in Recent Transactions following in this footnote for disposition of Company's interest in the unconsolidated joint ventures.