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Schedule III - Changes in Real Estate (Detail) (USD $)
In Thousands, unless otherwise specified
 5 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate [Line Items]        
Balance at end of period $ 588,429us-gaap_RealEstateGrossAtCarryingValue $ 670,868us-gaap_RealEstateGrossAtCarryingValue $ 421,989us-gaap_RealEstateGrossAtCarryingValue $ 363,832us-gaap_RealEstateGrossAtCarryingValue
Balance at beginning of period 493,263us-gaap_RealEstateGrossAtCarryingValue 670,868us-gaap_RealEstateGrossAtCarryingValue 421,989us-gaap_RealEstateGrossAtCarryingValue 363,832us-gaap_RealEstateGrossAtCarryingValue
Capital expenditures 6,563us-gaap_ImpairmentOfLongLivedAssetsHeldForUse      
Liquidation adjustment, net 167,080fur_RealEstateAndAccumulatedDepreciationLiquidationAdjustment [1]      
Disposals (109,104)us-gaap_RealEstateAccumulatedDepreciationPeriodIncreaseDecrease      
Liquidation Value [Member]        
Real Estate [Line Items]        
Balance at end of period $ 557,802us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		      
[1] Under the liquidation basis of accounting, real estate holdings are now carried at their estimated net realizable values. As a result, the net liquidation adjustment is the net adjustment that the Trust has made to the carrying value of the properties in order to reflect the liquidation value.