Reflects the revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations. Additionally, reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

No definition available.

Related Parties - Additional Information (Details)	12 Months Ended
Related Parties - Additional Information (Details)	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 21, 2019 USD ($) ft²
Related Party Transaction [Line Items]
Fee and other income	$ 34,703,000	$ 31,666,000	$ 35,477,000
Accounts and other receivables, net	19,231,000	20,076,000
Property management, asset management, leasing and other related services fee income	22,744,000	18,629,000	24,212,000
Transaction related costs	1,999,000	1,471,000	2,027,000
Accounts payable and accrued expenses	117,356,000	124,334,000
Note receivables from affiliates	$ 36,918,000
Area of office and retail properties \| ft²	13,100,000
712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Equity method paramount ownership percentage	50.00%
55 Second Street [Member]
Related Party Transaction [Line Items]
Equity method paramount ownership percentage	44.10%
Area of office and retail properties \| ft²				384,000
Transaction valued property value				$ 401,700,000
Fund X [Member]
Related Party Transaction [Line Items]
Note receivables from affiliates	$ 36,918,000
Note receivables basis spread on variable rate	2.20%
CNBB-RDF Holdings Otto Family [Member] \| 55 Second Street [Member]
Related Party Transaction [Line Items]
Transaction valued property value				$ 5,000,000
CNBB-RDF Holdings Otto Family [Member] \| Imperial Associates, LP [Member] \| 55 Second Street [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage by related party				2.30%
Hamburg Trust Consulting GMBH ("HTC") [Member]
Related Party Transaction [Line Items]
Mark-up cost percentage	10.00%
Transaction related costs	$ 796,000	240,000	247,000
Accounts payable and accrued expenses	$ 38,000	40,000
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	$ 360,000	366,000	358,000
Kramer Design Services [Member] \| 712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Equity method paramount ownership percentage	50.00%
Expense recognized	$ 325,000
Joint Venture [Member] \| 55 Second Street [Member]
Related Party Transaction [Line Items]
Equity method paramount ownership percentage				44.10%
Area of office and retail properties \| ft²				384,000
Transaction valued property value				$ 401,700,000
Mortgage debt				$ 187,500,000
Management Agreements [Member] \| CNBB-RDF Holdings Otto Family [Member]
Related Party Transaction [Line Items]
Fee and other income	842,000	838,000	824,000
Accounts and other receivables, net	0	51,000
Management Agreements [Member] \| Unconsolidated Joint Ventures and Real Estate Funds [Member]
Related Party Transaction [Line Items]
Accounts and other receivables, net	2,734,000	1,836,000
Property management, asset management, leasing and other related services fee income	$ 17,466,000	$ 15,231,000	$ 20,263,000