Net Assets in Liquidation - Additional Information (Detail) - USD ($)		3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2011	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2019
Net Assets in Liquidation [Line Items]
Distributable Assets		$ 321,100,000	$ 321,100,000
Cash and cash equivalents and marketable securities		435,300,000	435,300,000
Liquidating distributions payable		323,537,000	323,537,000			$ 1,785,000
Distributable Cash set aside for projected Trust fees, costs and expenses		80,700,000	80,700,000
Distributable cash pending distribution or set aside and not available for distribution		83,100,000	83,100,000
Accrued investment income		16,584,000	16,584,000			31,552,000
Change in Future Investment Income		1,800,000	15,800,000
Amount required to issue one Trust Unit per contingent rights	$ 1,000
Outstanding or issuable GUC Trust Units		32,086,501	32,086,501
Reversal of contingent settlement obligation				$ 15,000,000
Settlement payment obligation					$ 15,000,000
Allowed General Unsecured Claims	$ 29,771,000,000	32,086,000,000	32,086,000,000
GUC Trust Units [Member]
Net Assets in Liquidation [Line Items]
Liquidating distributions payable		323,500,000	323,500,000
Liquidating distributions payable to Guc unit holders		321,100,000	321,100,000
Accrued investment income		$ 14,500,000	$ 14,500,000			$ 30,300,000