Related Parties - Additional Information (Details)		1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 15, 2025 USD ($)	Feb. 28, 2025 USD ($)	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items]
Fee and other income				$ 8,272,000	$ 10,664,000	$ 25,282,000	$ 27,548,000
Accounts and other receivables			$ 26,582,000	26,582,000		26,582,000		$ 18,229,000
Fee income				4,124,000	6,776,000	13,369,000	17,328,000
Transaction related costs				9,981,000	242,000	10,840,000	843,000
Accounts payable and accrued expenses			$ 138,689,000	138,689,000		138,689,000		119,881,000
General and administrative				$ 16,340,000	16,672,000	$ 58,112,000	49,938,000
Area of leased properties | ft²			13,100,000	13,100,000		13,100,000
Rental revenue				$ 164,687,000	184,235,000	$ 511,741,000	543,636,000
CNBB-RDF Holdings Otto Family [Member] | Management Agreements [Member]
Related Party Transaction [Line Items]
Fee and other income				136,000	195,000	427,000	562,000
Accounts and other receivables			$ 39,000	39,000		39,000		31,000
Unconsolidated Joint Ventures and Real Estate Funds [Member] | Management Agreements [Member]
Related Party Transaction [Line Items]
Accounts and other receivables			$ 1,220,000	1,220,000		1,220,000		1,652,000
Fee income				$ 3,230,000	5,404,000	$ 9,743,000	14,214,000
Hamburg Trust Consulting GMBH ("HTC") [Member]
Related Party Transaction [Line Items]
Mark-up cost percentage			10.00%	10.00%		10.00%
Transaction related costs	$ 0		$ 0	$ 159,000	141,000	$ 378,000	386,000
Accounts payable and accrued expenses			$ 267,000	$ 267,000		$ 267,000		$ 113,000
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%		100.00%
Aircraft Services [Member]
Related Party Transaction [Line Items]
General and administrative				$ 0	439,000	$ 147,000	1,243,000
Aircraft Services [Member] | Chairman, Chief Executive Officer and President [Member]
Related Party Transaction [Line Items]
Percentage of ownership			50.00%	50.00%		50.00%
Mannheim Trust [Member] | Board of Director [Member] | 712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Lease rental income				$ 31,000	30,000	$ 92,000	89,000
Mannheim Trust [Member] | Board of Director [Member] | 712 Fifth Avenue [Member] | Lease expiring in June 2025 [Member]
Related Party Transaction [Line Items]
Area of leased properties | ft²			3,127	3,127		3,127
Equity method paramount ownership percentage			50.00%	50.00%		50.00%
ParkProperty Capital, LP [Member] | Former Board of Directors [Member]
Related Party Transaction [Line Items]
Rental revenue				$ 72,000	$ 71,000	$ 214,000	212,000
ParkProperty Capital, LP [Member] | Former Board of Directors [Member] | 1325 Avenue of the Americas [Member] | Lease expiring in November 2027 [Member]
Related Party Transaction [Line Items]
Area of leased properties | ft²			4,233	4,233		4,233
Debevoise and Plimpton LLP [Member]
Related Party Transaction [Line Items]
Accounts payable and accrued expenses			$ 13,000	$ 13,000		$ 13,000
General and administrative				635,000		909,000
Kramer Design Services [Member]
Related Party Transaction [Line Items]
Transaction related costs		$ 220,000
Business development costs incurred				$ 123,000		$ 162,000	$ 42,000
Kramer Design Services [Member] | Chairman, Chief Executive Officer and President [Member]
Related Party Transaction [Line Items]
Percentage of ownership			100.00%	100.00%		100.00%