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Related Parties - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Fee and other income $ 36,368,000 $ 35,222,000 $ 34,246,000
Accounts and other receivables, net 15,582,000 17,502,000  
Property management, asset management, leasing and other related services fee income 28,473,000 28,070,000 22,744,000
Transaction related costs 916,000 1,096,000 1,999,000
Accounts payable and accrued expenses $ 116,192,000 101,901,000  
712 Fifth Avenue [Member]      
Related Party Transaction [Line Items]      
Equity method paramount ownership percentage 50.00%    
CNBB-RDF Holdings Otto Family [Member] | Management Agreements [Member]      
Related Party Transaction [Line Items]      
Fee and other income $ 1,726,000 1,227,000 842,000
Accounts and other receivables, net 484,000 34,000  
Unconsolidated Joint Ventures and Real Estate Funds [Member] | Management Agreements [Member]      
Related Party Transaction [Line Items]      
Accounts and other receivables, net 2,883,000 5,011,000  
Property management, asset management, leasing and other related services fee income $ 23,240,000 22,986,000 17,466,000
Hamburg Trust Consulting GMBH ("HTC") [Member]      
Related Party Transaction [Line Items]      
Mark-up cost percentage 10.00%    
Transaction related costs $ 645,000 512,000 796,000
Accounts payable and accrued expenses $ 523,000 123,000  
Hamburg Trust Consulting GMBH ("HTC") [Member] | Chairman, Chief Executive Officer and President [Member]      
Related Party Transaction [Line Items]      
Percentage of ownership 100.00%    
Mannheim Trust [Member] | Board of Director [Member] | 712 Fifth Avenue [Member]      
Related Party Transaction [Line Items]      
Equity method paramount ownership percentage 50.00%    
Lease rental income $ 362,000 362,000 $ 360,000
Kramer Design Services [Member]      
Related Party Transaction [Line Items]      
Accounts payable and accrued expenses 0 0  
Development expenses $ 10,000 187,000  
Kramer Design Services [Member] | 712 Fifth Avenue [Member]      
Related Party Transaction [Line Items]      
Equity method paramount ownership percentage 50.00%    
Expense recognized   $ 29,000