Net Assets in Liquidation - Schedule of Cash and Cash Equivalent and Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 15, 2011
Cash and Cash Equivalents [Line Items]
Residual Wind-Down Assets	$ 200	$ 42,800
Funds for Indenture Trustee / Fiscal Paying Agent Costs	100
Total	122,500
Cash and Cash Equivalents and Marketable Securities [Member]
Cash and Cash Equivalents [Line Items]
Distributable Cash (including associated Dividend Cash)	91,494
Other Administrative Cash	29,563
Administrative Fund	1,145
Residual Wind-Down Assets	178	$ 40,000
Funds for Indenture Trustee / Fiscal Paying Agent Costs	90
Total	$ 122,470