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Investments in Unconsolidated Joint Ventures - Mortgages and Other Loans Payable (Details)
 6 Months Ended
Jun. 30, 2018
USD ($)
extension
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]    
Total fixed rate debt $ 1,861,696,000 $ 2,400,560,000
Total floating rate debt 677,000,000 465,431,000
Total fixed rate and floating rate debt 2,538,696,000 2,865,991,000
919 Third Avenue    
Debt Instrument [Line Items]    
Total fixed rate debt $ 0 500,000,000
1515 Broadway    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 56.87%  
Worldwide Plaza    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 24.35%  
Joint venture    
Debt Instrument [Line Items]    
Total fixed rate debt $ 6,026,624,000 5,569,138,000
Total floating rate debt 3,518,038,000 3,979,066,000
Total fixed rate and floating rate debt 9,544,662,000 9,548,204,000
Deferred financing costs, net (110,924,000) (136,103,000)
Total joint venture mortgages and other loans payable, net $ 9,433,738,000 9,412,101,000
Joint venture | 521 Fifth Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 50.50%  
Interest rate, fixed rate debt (as a percent) 3.73%  
Total fixed rate debt $ 170,000,000 170,000,000
Joint venture | 717 Fifth Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 10.92%  
Joint venture | 717 Fifth Avenue | Mortgage loan    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 4.45%  
Total fixed rate debt $ 300,000,000 300,000,000
Committed amount $ 300,000,000  
Joint venture | 717 Fifth Avenue | Mezzanine loans    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 5.50%  
Total fixed rate debt $ 355,328,000 355,328,000
Committed amount $ 355,300,000  
Joint venture | 650 Fifth Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 50.00%  
Joint venture | 650 Fifth Avenue | Mortgage loan    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 4.46%  
Total fixed rate debt $ 210,000,000 210,000,000
Long-term debt, carrying value $ 210,000,000  
Joint venture | 650 Fifth Avenue | Mezzanine loans    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 5.45%  
Total fixed rate debt $ 65,000,000 65,000,000
Joint venture | 21 East 66th Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 32.28%  
Interest rate, fixed rate debt (as a percent) 3.60%  
Interest rate, floating rate debt (as a percent) 2.75%  
Total fixed rate debt $ 12,000,000 12,000,000
Total floating rate debt $ 1,608,000 1,648,000
Joint venture | 919 Third Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 51.00%  
Interest rate, fixed rate debt (as a percent) 5.12%  
Total fixed rate debt $ 500,000,000 0
Joint venture | 3 Columbus Circle    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 48.90%  
Interest rate, fixed rate debt (as a percent) 3.61%  
Total fixed rate debt $ 350,000,000 350,000,000
Joint venture | 1515 Broadway    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 3.93%  
Total fixed rate debt $ 864,238,000 872,528,000
Joint venture | 11 Madison Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 60.00%  
Interest rate, fixed rate debt (as a percent) 3.84%  
Total fixed rate debt $ 1,400,000,000 1,400,000,000
Joint venture | 800 Third Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 60.52%  
Interest rate, fixed rate debt (as a percent) 3.37%  
Total fixed rate debt $ 177,000,000 177,000,000
Joint venture | East 400 Street 57    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 41.00%  
Interest rate, fixed rate debt (as a percent) 3.00%  
Total fixed rate debt $ 100,000,000 100,000,000
Joint venture | Worldwide Plaza    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 3.98%  
Total fixed rate debt $ 1,200,000,000 1,200,000,000
Joint venture | Stonehenge Portfolio    
Debt Instrument [Line Items]    
Interest rate, fixed rate debt (as a percent) 4.20%  
Interest rate, floating rate debt (as a percent) 1.40%  
Total fixed rate debt $ 323,058,000 357,282,000
Total floating rate debt 38,000,000 55,340,000
Joint venture | 1745 Broadway    
Debt Instrument [Line Items]    
Total floating rate debt $ 0 345,000,000
Joint venture | 55 West 46th Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 25.00%  
Interest rate, floating rate debt (as a percent) 2.13%  
Total floating rate debt $ 174,430,000 171,444,000
Committed amount 195,000,000  
Unused borrowing capacity, amount 20,600,000  
Joint venture | 175-225 Third Street Brooklyn, New York    
Debt Instrument [Line Items]    
Total floating rate debt 0 40,000,000
Joint venture | Jericho Plaza    
Debt Instrument [Line Items]    
Total floating rate debt $ 0 81,099,000
Joint venture | 724 Fifth Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 50.00%  
Interest rate, floating rate debt (as a percent) 2.42%  
Total floating rate debt $ 275,000,000 275,000,000
Joint venture | 1552 Broadway    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 50.00%  
Interest rate, floating rate debt (as a percent) 2.65%  
Total floating rate debt $ 195,000,000 195,000,000
Joint venture | 280 Park Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 50.00%  
Interest rate, floating rate debt (as a percent) 1.73%  
Total floating rate debt $ 1,200,000,000 1,200,000,000
Joint venture | 121 Greene Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 50.00%  
Interest rate, floating rate debt (as a percent) 1.50%  
Total floating rate debt $ 15,000,000 15,000,000
Joint venture | 10 East 53rd Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 55.00%  
Interest rate, floating rate debt (as a percent) 2.25%  
Total floating rate debt $ 170,000,000 170,000,000
Joint venture | 131-137 Spring Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 20.00%  
Interest rate, floating rate debt (as a percent) 1.55%  
Total floating rate debt $ 141,000,000 141,000,000
Joint venture | 11 West 34th Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 30.00%  
Interest rate, floating rate debt (as a percent) 1.45%  
Total floating rate debt $ 23,000,000 23,000,000
Joint venture | 100 Park Avenue    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 49.90%  
Interest rate, floating rate debt (as a percent) 1.75%  
Total floating rate debt $ 360,000,000 360,000,000
Joint venture | One Vanderbilt    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 71.01%  
Interest rate, floating rate debt (as a percent) 3.50%  
Total floating rate debt $ 375,000,000 355,535,000
Joint venture | One Vanderbilt | Construction Loans    
Debt Instrument [Line Items]    
Maximum facility capacity $ 1,500,000,000.0  
Credit facility, interest rate (as a percent) 3.50%  
Term (in Years) 5 years  
Number of extension options | extension 2  
Period of extension options 1 year  
Joint venture | 605 West 42nd Street    
Debt Instrument [Line Items]    
Economic Interest (as a percent) 20.00%  
Interest rate, floating rate debt (as a percent) 1.44%  
Total floating rate debt $ 550,000,000 $ 550,000,000
Mezzanine Loan, Initial Maturity October 2022 [Member] | Joint venture | 650 Fifth Avenue | Mezzanine loans    
Debt Instrument [Line Items]    
Long-term debt, carrying value 65,000,000  
Secured Debt, Initial Maturity August 2019 | Joint venture | Stonehenge Portfolio    
Debt Instrument [Line Items]    
Total fixed rate debt 135,700,000  
Secured Debt, Initial Maturity June 2024 | Joint venture | Stonehenge Portfolio    
Debt Instrument [Line Items]    
Total fixed rate debt 54,800,000  
Secured Debt, Initial Maturity April 2028 | Joint venture | Stonehenge Portfolio    
Debt Instrument [Line Items]    
Total fixed rate debt $ 132,600,000