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Related Parties - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]          
Fee and other income $ 7,897,000 $ 8,280,000 $ 29,934,000 $ 23,941,000  
Accounts and other receivables 19,865,000   19,865,000   $ 15,582,000
Fee income 5,132,000 6,561,000 23,094,000 19,432,000  
Accounts payable and accrued expenses $ 152,371,000   152,371,000   116,192,000
Due from affiliates     59,000,000    
Repayment of amounts due from affiliates     $ 59,000,000    
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 $ 272,000 270,000 $ 1,021,000 1,497,000  
Accounts and other receivables 53,000   53,000   484,000
Unconsolidated Joint Ventures and Real Estate Funds [Member] | Management Agreements [Member]          
Related Party Transaction [Line Items]          
Accounts and other receivables 2,966,000   2,966,000   2,883,000
Fee income $ 4,277,000 5,737,000 $ 20,075,000 16,239,000  
Hamburg Trust Consulting GMBH ("HTC") [Member]          
Related Party Transaction [Line Items]          
Mark-up cost percentage 10.00%   10.00%    
Transaction related costs $ 105,000 127,000 $ 621,000 372,000  
Accounts payable and accrued expenses $ 123,000   $ 123,000   $ 523,000
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 $ 273,000 $ 272,000  
Fund X [Member]          
Related Party Transaction [Line Items]          
Due from affiliates     59,000,000    
Repayment of accrued interest     $ 418,000    
Fund X [Member] | Secured Overnight Financing Rate (SOFR) [Member]          
Related Party Transaction [Line Items]          
Fixed/Variable Rate     2.20%