Equity Investments - Liquidating Trust's Nominal Ownership Percentages in its Equity Investments (Detail)	Dec. 31, 2018	Dec. 31, 2017
Atrium Mall LLC [Member] | Marc Realty [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	50.00%	50.00%
701 Seventh WRT Investor LLC [Member] | New Valley/Witkoff [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	79.70%	79.70%
446 High Line LLC [Member] | Serure CB High Line [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	80.00%	83.80%
Concord Debt Holdings LLC [Member] | Inland [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	0.00%	66.60%
CDH CDO LLC [Member] | Inland [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	0.00%	49.60%