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Related Parties - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Fee and other income $ 8,280,000 $ 11,355,000 $ 23,941,000 $ 27,045,000  
Accounts and other receivables, net 11,385,000   11,385,000   $ 17,502,000
Property management, asset management, leasing and other related services fee income 6,561,000 9,153,000 19,432,000 21,692,000  
Transaction related costs 87,000 81,000 503,000 542,000  
Accounts payable and accrued expenses $ 117,758,000   $ 117,758,000   101,901,000
712 Fifth Avenue [Member]          
Related Party Transaction [Line Items]          
Equity method paramount ownership percentage 50.00%   50.00%    
CNBB-RDF Holdings Otto Family [Member] | Management Agreements [Member]          
Related Party Transaction [Line Items]          
Fee and other income $ 270,000 260,000 $ 1,497,000 967,000  
Accounts and other receivables, net 474,000   474,000   34,000
Unconsolidated Joint Ventures and Real Estate Funds [Member] | Management Agreements [Member]          
Related Party Transaction [Line Items]          
Accounts and other receivables, net 4,097,000   4,097,000   5,011,000
Property management, asset management, leasing and other related services fee income $ 5,737,000 6,841,000 $ 16,239,000 17,550,000  
Hamburg Trust Consulting GMBH ("HTC") [Member]          
Related Party Transaction [Line Items]          
Mark-up cost percentage 10.00%   10.00%    
Transaction related costs $ 127,000 124,000 $ 372,000 389,000  
Accounts payable and accrued expenses $ 250,000   $ 250,000   123,000
Hamburg Trust Consulting GMBH ("HTC") [Member] | Chairman, Chief Executive Officer and President [Member]          
Related Party Transaction [Line Items]          
Percentage of ownership 100.00%   100.00%    
Mannheim Trust [Member] | Board of Director [Member] | 712 Fifth Avenue [Member]          
Related Party Transaction [Line Items]          
Equity method paramount ownership percentage 50.00%   50.00%    
Lease rental income $ 91,000 91,000 $ 272,000 272,000  
Kramer Design Services [Member]          
Related Party Transaction [Line Items]          
Accounts payable and accrued expenses 0   0   $ 0
Development expenses $ 10,000 $ 47,000 $ 10,000 187,000  
Kramer Design Services [Member] | 712 Fifth Avenue [Member]          
Related Party Transaction [Line Items]          
Equity method paramount ownership percentage 50.00%   50.00%    
Expense recognized       $ 29,000