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) - USD ($)		3 Months Ended		12 Months Ended
	Mar. 27, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Fee and other income		$ 8,561,000	$ 9,048,000
Accounts and other receivables, net		17,826,000		$ 19,231,000
Property management, asset management, leasing and other related services fee income		6,330,000	5,999,000
Transaction related costs		203,000	736,000
Accounts payable and accrued expenses		109,563,000		117,356,000
Due from Affiliates			11,000,000
Repayment of note receivables		$ 36,918,000
Fund X [Member]
Related Party Transaction [Line Items]
Due from Affiliates				36,918,000
Repayment of note receivables	$ 36,918,000
Repayment of accrued interest	$ 349,000
Note receivables basis spread on variable rate		2.20%
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		$ 448,000	209,000
Accounts and other receivables, net				0
Unconsolidated Joint Ventures and Real Estate Funds [Member] \| Management Agreements [Member]
Related Party Transaction [Line Items]
Accounts and other receivables, net		2,066,000		2,734,000
Property management, asset management, leasing and other related services fee income		$ 5,313,000	4,547,000
Hamburg Trust Consulting GMBH ("HTC") [Member]
Related Party Transaction [Line Items]
Mark-up cost percentage		10.00%
Transaction related costs		$ 139,000	624,000
Accounts payable and accrued expenses		$ 126,000		$ 38,000
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		$ 91,000	$ 91,000
Kramer Design Services [Member] \| 712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Equity method paramount ownership percentage		50.00%
Expense recognized		$ 30,000