Net Assets in Liquidation - Reconciliation of Shareholder's Equity under Going Concern Basis of Accounting to Net Assets in Liquidation under Liquidation Basis of Accounting (Detail) (USD $)	0 Months Ended	2 Months Ended
	Aug. 01, 2014	Sep. 30, 2014	Aug. 01, 2014	Jul. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Liquidation Basis Of Accounting [Line Items]
Shareholder's Equity as of July 31, 2014			$ 476,454,000	$ (514,214,000)	$ (509,663,000)	$ (507,078,000)	$ (469,264,000)
Increase due to estimated net realizable value of investments		118,621,000
Secured financing			(1,699,000)		(29,150,000)
Loan securities			692,000
Deconsolidation of properties			10,178,000
Decrease due to write-off of assets and liabilities	(44,691,000)
Increase in non-controlling interest			(35,675,000)
Adjustment to reflect the change to the liquidation basis of accounting			310,461,000
Net assets in liquidation			786,915,000
Real Estate Investment [Member]
Liquidation Basis Of Accounting [Line Items]
Increase due to estimated net realizable value of investments	220,338,000
Equity Investments [Member]
Liquidation Basis Of Accounting [Line Items]
Increase due to estimated net realizable value of investments	182,472,000
Loans Receivable [Member]
Liquidation Basis Of Accounting [Line Items]
Increase due to estimated net realizable value of investments	6,071,000
Liability [Member]
Liquidation Basis Of Accounting [Line Items]
Liability for estimated costs in excess of estimated receipts during liquidation	$ (27,225,000)