Organization - Additional Information (Detail) ft² in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) ft² Investment	Oct. 18, 2017 USD ($)	Jun. 01, 2017	Oct. 30, 2013
Worldwide Plaza [Member]
Organization [Line Items]
Reserved amount		$ 90.7
Ownership percentage	50.10%			48.90%
Worldwide Plaza [Member] | SL Green Realty Corp. and RXR Realty LLC [Member]
Organization [Line Items]
Ownership percentage		48.70%
Liquidation Value [Member] | WWP Holdings Llc [Member]
Organization [Line Items]
Area of investments | ft²	2.0
Occupancy percentage	91.50%
Number of investments | Investment	1
Ownership percentage	50.10%
Cash, cash equivalents and restricted cash	$ 92.0
Liquidation Value [Member] | Worldwide Plaza [Member]
Organization [Line Items]
Ownership percentage			98.80%
Liquidation Value [Member] | Supplier Concentration Risk [Member] | Composition of Real Estate Portfolio [Member] | Office Building [Member] | WWP Holdings Llc [Member]
Organization [Line Items]
Concentration risk percent	88.00%
Liquidation Value [Member] | Supplier Concentration Risk [Member] | Composition of Real Estate Portfolio [Member] | Retail Site [Member] | WWP Holdings Llc [Member]
Organization [Line Items]
Concentration risk percent	5.00%
Liquidation Value [Member] | Supplier Concentration Risk [Member] | Composition of Real Estate Portfolio [Member] | Parking Garage [Member] | WWP Holdings Llc [Member]
Organization [Line Items]
Concentration risk percent	7.00%