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Related Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]        
Operating expenses, paid to related parties   $ 21,400 $ 21,890 $ 20,071
Amounts due from/to related parties        
Due from joint ventures $ 1,240 15,025 1,240  
Other 14,616 8,014 14,616  
Related party receivables 15,856 23,039 15,856  
Alliance Building Services        
Related Party Transaction [Line Items]        
Profit participation from related party   3,900 3,500 3,800
Operating expenses, paid to related parties   22,600 23,400 21,300
Entity with Stephen L Green ownership interest        
Related Party Transaction [Line Items]        
Property management fees from related party   $ 500 700 $ 500
One Vanderbilt        
Amounts due from/to related parties        
Stabilization of property, within three years after stabilization, percent   50.00%    
Stabilization of property, three years or more after stabilization, percent   100.00%    
Stabilization of property, anniversary period   7 years    
One Vanderbilt | Marc Holliday        
Related Party Transaction [Line Items]        
Due from (to) related party 1,400   1,400  
One Vanderbilt | Andrew Mathias        
Related Party Transaction [Line Items]        
Due from (to) related party $ 1,000   $ 1,000  
One Vanderbilt | Minimum | Marc Holliday        
Related Party Transaction [Line Items]        
Percentage of profits due to investors 150.00%      
One Vanderbilt | Minimum | Andrew Mathias        
Related Party Transaction [Line Items]        
Percentage of profits due to investors 100.00%      
One Vanderbilt | Maximum | Marc Holliday        
Related Party Transaction [Line Items]        
Percentage of profits due to investors 180.00%      
One Vanderbilt | Maximum | Andrew Mathias        
Related Party Transaction [Line Items]        
Percentage of profits due to investors 120.00%