Liability for Estimated Costs in Excess of Estimated Receipts During Liquidation - Schedule of Changes in Liability for Estimated Costs in Excess of Estimated Receipts During Liquidation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Significant Acquisitions and Disposals [Line Items]
Total liability for estimated costs in excess of estimated receipts during liquidation, beginning balance	$ (31,253)
Cash Payments (Receipts)	414
Remeasurement of Assets and Liabilities	3,724
Total liability for estimated costs in excess of estimated receipts during liquidation, ending balance	(35,391)
Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Estimated net inflows from investments in real estate and loans receivable, beginning balance	25,169
Cash Payments (Receipts)	3,939
Remeasurement of Assets and Liabilities	2,792
Estimated net inflows from investments in real estate and loans receivable, ending balance	18,438
Liability [Member]
Significant Acquisitions and Disposals [Line Items]
Total liability for estimated costs, beginning balance	(56,422)
Cash Payments (Receipts)	3,525
Remeasurement of Assets and Liabilities	(932)
Total liability for estimated costs, ending balance	(53,829)
Liability [Member] | Sales Costs [Member]
Significant Acquisitions and Disposals [Line Items]
Total liability for estimated costs, beginning balance	(11,840)
Cash Payments (Receipts)
Remeasurement of Assets and Liabilities	(92)
Total liability for estimated costs, ending balance	(11,932)
Liability [Member] | Corporate Expenditures [Member]
Significant Acquisitions and Disposals [Line Items]
Total liability for estimated costs, beginning balance	(44,582)
Cash Payments (Receipts)	3,525
Remeasurement of Assets and Liabilities	(840)
Total liability for estimated costs, ending balance	$ (41,897)