Net Assets in Liquidation - Additional Information (Detail) (USD $)	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Jul. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Net Asset Liability During Liquidation [Line Items]
Decrease in net assets on liquidation		$ 118,621,000
Distributions of accrued amounts to Series D Preferred Shareholders	929,000		2,787,000	6,502,000		8,360,000
Liquidation distribution per share					$ 18.35
Liquidation date, expected to complete					Sep. 30, 2014
Series D Preferred Shares of Beneficial Interest [Member]
Net Asset Liability During Liquidation [Line Items]
Distributions of accrued amounts to Series D Preferred Shareholders				$ 6,502,000	$ 121,890,000	$ 8,360,000