Liquidating Distributions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Distribution Made to Limited Partner [Line Items]
Cash distributions payable	$ 0.2	$ 0.6
New GM Common Stock [Member]
Distribution Made to Limited Partner [Line Items]
GUC Trust distribution obligation	575,278	288,600
New GM Series A Warrants [Member]
Distribution Made to Limited Partner [Line Items]
GUC Trust distribution obligation	522,865	262,306
New GM Series B Warrants [Member]
Distribution Made to Limited Partner [Line Items]
GUC Trust distribution obligation	522,865	262,306