Net Assets in Liquidation - Additional Information (Detail)				3 Months Ended		9 Months Ended	12 Months Ended
	Feb. 17, 2021 USD ($)	Jan. 31, 2021 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Mar. 31, 2020 USD ($) shares
Net Assets in Liquidation [Line Items]
Distributable Assets				$ 56,200,000		$ 56,200,000
Cash and cash equivalents and marketable securities				119,400,000		119,400,000
Liquidating distributions payable				58,696,000		58,696,000	$ 351,876,000
Distributable Cash set aside for projected Trust fees, costs and expenses				32,800,000		32,800,000
Distributable cash pending distribution or set aside and not available for distribution				35,300,000		35,300,000
Change in Future Investment Income				39,000		800,000
Amount required to issue one Trust Unit per contingent rights			$ 1,000
Allowed General Unsecured Claims			$ 29,771,000,000
noticing costs paid					$ 2,000,000
liquidating distributions payable to holders of Allowed General Unsecured Claims and GUC Trust Beneficiaries				2,500,000		2,500,000
Settlement Obligation							48,000,000
Subsequent Event [Member]
Net Assets in Liquidation [Line Items]
Settlement Consideration	$ 48,000,000
Allowed and Disputed Claims [Member]
Net Assets in Liquidation [Line Items]
Allowed General Unsecured Claims				32,086,000,000		32,086,000,000
GUC Trust Units [Member]
Net Assets in Liquidation [Line Items]
Liquidating distributions payable				58,700,000		58,700,000
Liquidating distributions payable to Guc unit holders				56,200,000		56,200,000
Accrued Future Investment Income				$ 7,000		$ 7,000	$ 800,000
Outstanding or issuable GUC Trust Units | shares				32,086,501		32,086,501	32,086,501
liquidating distributions payable to holders of Allowed General Unsecured Claims and GUC Trust Beneficiaries				$ 2,500,000		$ 2,500,000
GUC Trust Units [Member] | Subsequent Event [Member]
Net Assets in Liquidation [Line Items]
Liquidating distributions payable to Guc unit holders		$ 54,700,000