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Equity Investments - Trust's Nominal Ownership Percentages in its Equity Investments (Detail)
Mar. 31, 2015
Dec. 31, 2014
Vintage Housing Holdings, LLC [Member] | Gancar Trust [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 75.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= fur_VintageHousingHoldingsLlcMember		 75.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= fur_GancarTrustMember
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= fur_VintageHousingHoldingsLlcMember
WRT One South State Lender LP [Member] | Elad Canada Ltd [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_EladCanadaIncMember
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= fur_WrtOneSouthStateLenderLpMember		 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= fur_EladCanadaIncMember
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= fur_WrtOneSouthStateLenderLpMember
WRT-Elad One South State Equity LP [Member] | Elad Canada Ltd [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_EladCanadaIncMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_WrtEladOneSouthStateEquityLpMember		 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_EladCanadaIncMember
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= fur_WrtEladOneSouthStateEquityLpMember
RE CDO Management LLC [Member] | Atrium Holding [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_AtriumHoldingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_ReCdoManagementLlcMember		 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_AtriumHoldingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_ReCdoManagementLlcMember
Mentor Retail LLC [Member] | Freed [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 49.90%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= fur_FreedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_MentorRetailLlcMember		 49.90%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= fur_FreedMember
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= fur_MentorRetailLlcMember
Concord Debt Holdings LLC [Member] | Inland [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 33.30%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_ConcordDebtHoldingsLlcOneMember		 33.30%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_ConcordDebtHoldingsLlcOneMember
Concord Debt Holdings LLC [Member] | Inland/Lexington [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 33.30%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandLexingtonMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_ConcordDebtHoldingsLlcOneMember		 33.30%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandLexingtonMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_ConcordDebtHoldingsLlcOneMember
CDH CDO LLC [Member] | Inland [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 24.80%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_CdhCdoLlcMember		 24.80%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_CdhCdoLlcMember
CDH CDO LLC [Member] | Inland/Lexington [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 24.80%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandLexingtonMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_CdhCdoLlcMember		 24.80%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_InlandLexingtonMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_CdhCdoLlcMember
Atrium Mall LLC [Member] | Marc Realty [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_MarcRealtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_AtriumMallLlcMember		 50.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_MarcRealtyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_AtriumMallLlcMember
701 Seventh WRT Investor LLC [Member] | New Valley/Witkoff [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 81.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_NewValleyWitkoffMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_SevenZeroOneSeventhWrtInvestorsLlcMember		 81.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_NewValleyWitkoffMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_SevenZeroOneSeventhWrtInvestorsLlcMember
RS Summit Pointe [Member] | RS Summit Pointe Apartments LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 80.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_RsSummitPointeApartmentsLlcMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_RsSummitPointeMember		 80.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_RsSummitPointeApartmentsLlcMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_RsSummitPointeMember
Edens Plaza Associates LLC [Member] | Freed [Member] | Maximum [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 1.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= us-gaap_MaximumMember
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= fur_FreedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_EdensPlazaAssociatesLlcMember		 1.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
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= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_FreedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_EdensPlazaAssociatesLlcMember
Irving-Harlem Venture Limited [Member] | Freed [Member] | Maximum [Member]    
Schedule of Equity Method Investments [Line Items]    
Nominal % Ownership 1.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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= fur_FreedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fur_IrvingHarlemVentureLimitedMember		 1.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePlannedSaleInvestmentsNotIdentifiedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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= fur_FreedMember
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= fur_IrvingHarlemVentureLimitedMember