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Related Parties - Additional Information (Details)
12 Months Ended
Nov. 13, 2018
USD ($)
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]        
Repayments of related party notes $ 27,299,000 $ 27,299,000    
Interest Expense, Related Party   334,000 $ 197,000 $ 139,000
Fee and other income   34,651,000 37,666,000 48,237,000
Accounts and other receivables, net   20,076,000 17,082,000  
Property management, asset management, leasing and other related services fee income   18,629,000 24,212,000 16,931,000
Transaction related costs   1,471,000 2,027,000 2,404,000
Accounts payable and accrued expenses   $ 124,334,000 117,630,000  
Area of related party lease | ft²   11,900,000    
712 Fifth Avenue [Member]        
Related Party Transaction [Line Items]        
Equity method ownership percentage   50.00%    
Management Agreements [Member]        
Related Party Transaction [Line Items]        
Fee and other income   $ 838,000 824,000 795,000
CNBB-RDF Holdings, LP [Member]        
Related Party Transaction [Line Items]        
Repayments of related party notes 24,500,000      
CNBB-RDF Holdings Otto Family [Member]        
Related Party Transaction [Line Items]        
Repayments of related party notes $ 2,799,000      
CNBB-RDF Holdings Otto Family [Member] | Management Agreements [Member]        
Related Party Transaction [Line Items]        
Accounts and other receivables, net   51,000 0  
Unconsolidated Joint Ventures and Real Estate Funds [Member] | Management Agreements [Member]        
Related Party Transaction [Line Items]        
Accounts and other receivables, net   1,836,000 1,627,000  
Property management, asset management, leasing and other related services fee income   $ 15,231,000 20,263,000 9,920,000
Hamburg Trust Consulting GMBH ("HTC") [Member]        
Related Party Transaction [Line Items]        
Mark-up cost percentage   10.00%    
Transaction related costs   $ 240,000 247,000 625,000
Accounts payable and accrued expenses   $ 40,000 51,000  
Hamburg Trust Consulting GMBH ("HTC") [Member] | Chairman, Chief Executive Officer and President [Member]        
Related Party Transaction [Line Items]        
Percentage of ownership   100.00%    
Mannheim Trust [Member] | Board of Director [Member] | 712 Fifth Avenue [Member]        
Related Party Transaction [Line Items]        
Equity method ownership percentage   50.00%    
Area of related party lease | ft²   5,593    
Lease rental income   $ 366,000 $ 358,000 $ 416,000
Notes Payable To Related Parties [Member] | CNBB-RDF Holdings, LP [Member]        
Related Party Transaction [Line Items]        
Note payable, fixed bearing interest rate   1.40%    
Notes Payable To Related Parties [Member] | CNBB-RDF Holdings Otto Family [Member]        
Related Party Transaction [Line Items]        
Note payable, fixed bearing interest rate   1.40%