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Investments in Unconsolidated Joint Ventures - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended
May 08, 2019
property
Feb. 28, 2019
property
Oct. 31, 2016
Mar. 31, 2019
USD ($)
ft²
unit
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
General information on each joint venture            
Equity method investments       $ 3,055,368   $ 3,019,020
Net equity investment in VIEs in which the entity is not primary beneficiary       $ 869,500   808,300
Unaudited Approximate Square Feet (sqft) | ft²       30,028,056    
Purchase price and other fair value adjustments       $ (2,041) $ 49,293  
100 Park Avenue            
General information on each joint venture            
Ownership Interest       49.90%    
Unaudited Approximate Square Feet (sqft) | ft²       834,000    
Acquisition Price       $ 95,800    
717 Fifth Avenue            
General information on each joint venture            
Ownership Interest       10.92%    
Unaudited Approximate Square Feet (sqft) | ft²       119,500    
Acquisition Price       $ 251,900    
800 Third Avenue            
General information on each joint venture            
Ownership Interest       60.52%    
Unaudited Approximate Square Feet (sqft) | ft²       526,000    
Acquisition Price       $ 285,000    
11 West 34th Street            
General information on each joint venture            
Ownership Interest       30.00%    
Unaudited Approximate Square Feet (sqft) | ft²       17,150    
Acquisition Price       $ 10,800    
280 Park Avenue            
General information on each joint venture            
Ownership Interest       50.00%    
Unaudited Approximate Square Feet (sqft) | ft²       1,219,158    
Acquisition Price       $ 400,000    
1552-1560 Broadway            
General information on each joint venture            
Ownership Interest       50.00%    
Unaudited Approximate Square Feet (sqft) | ft²       57,718    
Acquisition Price       $ 136,550    
10 East 53rd Street            
General information on each joint venture            
Ownership Interest       55.00%    
Unaudited Approximate Square Feet (sqft) | ft²       354,300    
Acquisition Price       $ 252,500    
521 Fifth Avenue(5)            
General information on each joint venture            
Ownership Interest       50.50%    
Unaudited Approximate Square Feet (sqft) | ft²       460,000    
Acquisition Price       $ 315,000    
21 East 66th Street            
General information on each joint venture            
Ownership Interest       32.28%    
Unaudited Approximate Square Feet (sqft) | ft²       13,069    
Acquisition Price       $ 75,000    
650 Fifth Avenue            
General information on each joint venture            
Ownership Interest       50.00%    
Unaudited Approximate Square Feet (sqft) | ft²       69,214    
Acquisition Price       $ 0    
121 Greene Street            
General information on each joint venture            
Ownership Interest       50.00%    
Unaudited Approximate Square Feet (sqft) | ft²       7,131    
Acquisition Price       $ 27,400    
55 West 46th Street            
General information on each joint venture            
Ownership Interest       25.00%    
Unaudited Approximate Square Feet (sqft) | ft²       347,000    
Acquisition Price       $ 295,000    
Stonehenge Portfolio            
General information on each joint venture            
Ownership Interest     90.00%      
Unaudited Approximate Square Feet (sqft) | ft²       1,439,016    
Acquisition Price       $ 36,668    
Number of properties sold | property   1        
605 West 42nd Street            
General information on each joint venture            
Ownership Interest       20.00%    
Unaudited Approximate Square Feet (sqft) | ft²       927,358    
Acquisition Price       $ 759,000    
11 Madison Avenue            
General information on each joint venture            
Ownership Interest       60.00%    
Unaudited Approximate Square Feet (sqft) | ft²       2,314,000    
Acquisition Price       $ 2,605,000    
333 East 22nd St            
General information on each joint venture            
Ownership Interest       33.33%    
Economic Interest (as a percent)       33.33%    
Unaudited Approximate Square Feet (sqft) | ft²       26,926    
Acquisition Price       $ 0    
East 400 Street 57            
General information on each joint venture            
Ownership Interest     51.00% 51.00%    
Unaudited Approximate Square Feet (sqft) | ft²       290,482    
Acquisition Price       $ 170,000    
1552 Broadway            
General information on each joint venture            
Unaudited Approximate Square Feet (sqft) | ft²       13,045    
One Vanderbilt            
General information on each joint venture            
Ownership Interest       71.01%    
Unaudited Approximate Square Feet (sqft) | ft²       0    
Acquisition Price       $ 3,310,000    
Maximum ownership percentage of partners       29.00%    
Partners' ownership percentage       28.17%    
Worldwide Plaza            
General information on each joint venture            
Ownership Interest       24.35%    
Economic Interest (as a percent)       24.35%    
Unaudited Approximate Square Feet (sqft) | ft²       2,048,725    
Acquisition Price       $ 1,725,000    
1515 Broadway            
General information on each joint venture            
Ownership Interest       56.87%    
Economic Interest (as a percent)       56.87%    
Unaudited Approximate Square Feet (sqft) | ft²       1,750,000    
Acquisition Price       $ 1,950,000    
2 Herald Square            
General information on each joint venture            
Ownership Interest       51.00%    
Economic Interest (as a percent)       51.00%    
Unaudited Approximate Square Feet (sqft) | ft²       369,000    
Acquisition Price       $ 266,000    
East 400 Street 57            
General information on each joint venture            
Ownership percentage in disposed asset     49.00%      
21 East 66th Street | Three Retail and Two Residential Units            
General information on each joint venture            
Ownership Interest       3228.00%    
Number of stores | unit       3    
Number of residential units | unit       2    
21 East 66th Street | Three Residential Units            
General information on each joint venture            
Ownership Interest       1614.00%    
Number of residential units | unit       3    
Joint venture            
General information on each joint venture            
Equity method investments       $ 3,055,368   $ 3,019,020
Equity method investments with negative book value       $ 79,700    
Joint venture | 100 Park Avenue            
General information on each joint venture            
Economic Interest (as a percent)       49.90%    
Joint venture | 717 Fifth Avenue            
General information on each joint venture            
Economic Interest (as a percent)       10.92%    
Joint venture | 800 Third Avenue            
General information on each joint venture            
Economic Interest (as a percent)       60.52%    
Joint venture | 919 Third Avenue            
General information on each joint venture            
Ownership Interest       51.00%    
Economic Interest (as a percent)       51.00%    
Unaudited Approximate Square Feet (sqft) | ft²       1,454,000    
Acquisition Price       $ 1,256,727    
Joint venture | 11 West 34th Street            
General information on each joint venture            
Economic Interest (as a percent)       30.00%    
Joint venture | 280 Park Avenue            
General information on each joint venture            
Economic Interest (as a percent)       50.00%    
Joint venture | 1552-1560 Broadway            
General information on each joint venture            
Economic Interest (as a percent)       50.00%    
Joint venture | 10 East 53rd Street            
General information on each joint venture            
Economic Interest (as a percent)       55.00%    
Joint venture | 521 Fifth Avenue(5)            
General information on each joint venture            
Economic Interest (as a percent)       50.50%    
Joint venture | 21 East 66th Street            
General information on each joint venture            
Economic Interest (as a percent)       32.28%    
Joint venture | 650 Fifth Avenue            
General information on each joint venture            
Economic Interest (as a percent)       50.00%    
Joint venture | 121 Greene Street            
General information on each joint venture            
Economic Interest (as a percent)       50.00%    
Joint venture | 55 West 46th Street            
General information on each joint venture            
Economic Interest (as a percent)       25.00%    
Joint venture | Stonehenge Portfolio            
General information on each joint venture            
Ownership Interest     10.00%      
Joint venture | 605 West 42nd Street            
General information on each joint venture            
Economic Interest (as a percent)       20.00%    
Joint venture | 11 Madison Avenue            
General information on each joint venture            
Economic Interest (as a percent)       60.00%    
Joint venture | East 400 Street 57            
General information on each joint venture            
Economic Interest (as a percent)       41.00%    
Joint venture | One Vanderbilt            
General information on each joint venture            
Economic Interest (as a percent)       71.01%    
Subsequent Event | Stonehenge Portfolio            
General information on each joint venture            
Number of properties sold | property 1