Equity Investments - Liquidating Trust's Nominal Ownership Percentages in its Equity Investments (Detail)	Dec. 31, 2017	Dec. 31, 2016
RE CDO Management LLC [Member] | Atrium Holding [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership		50.00%
Concord Debt Holdings LLC [Member] | Inland [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	66.60%	66.60%
CDH CDO LLC [Member] | Inland [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	49.60%	49.60%
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%	80.50%
446 High Line LLC [Member] | Serure CB High Line [Member]
Schedule of Equity Method Investments [Line Items]
Nominal % Ownership	83.80%	72.00%