Liquidating Distributions - Additional Information (Detail) - USD ($) $ in Millions	Aug. 05, 2015	Jun. 30, 2015
Distribution Made to Limited Partner [Line Items]
Cash distributions payable		$ 0.4
New GM Common Stock [Member]
Distribution Made to Limited Partner [Line Items]
GUC Trust distribution obligation		204,336
New GM Series A Warrants [Member]
Distribution Made to Limited Partner [Line Items]
GUC Trust distribution obligation		185,686
New GM Series B Warrants [Member]
Distribution Made to Limited Partner [Line Items]
GUC Trust distribution obligation		185,686
New GM Securities [Member] | Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Liquidating Distributions Payable in Distributable Cash in lieu of New GM Securities	$ 13.3