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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended 7 Months Ended 12 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended
Mar. 31, 2014
Jul. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Sep. 30, 2012
Jun. 30, 2014
Financial Instruments And Fair Value Measurements [Line Items]                  
Inter-level transfer of assets   $ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount   $ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount          
Inter-level transfer of liabilities   0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount   0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount          
Loan securities carried at fair value   226,000us-gaap_SecuritiesLoanedAsset   226,000us-gaap_SecuritiesLoanedAsset          
Property impairment charges   9,287,000us-gaap_ImpairmentOfRealEstate 69,543,000us-gaap_ImpairmentOfRealEstate 2,904,000us-gaap_ImpairmentOfRealEstate   3,260,000us-gaap_ImpairmentOfRealEstate      
Discount rate 8.00%us-gaap_FairValueInputsDiscountRate                
Market rent growth rate 2.00%fur_FairValueInputsMarketRentGrowthRate                
Expense growth rate 2.00%fur_FairValueInputsExpenseGrowthRate                
Net unrealized gain   0us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities   73,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities 73,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities 7,363,000us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities      
Change in fair value of loan securities   0fur_ChangesInFairValueAvailableForSaleSecurities   0fur_ChangesInFairValueAvailableForSaleSecurities          
Denton Texas [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Impairment charges             154,000us-gaap_AssetImpairmentCharges
/ us-gaap_RealEstatePropertiesAxis
= fur_DentonTexasMember
   
Memphis [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Impairment charges               698,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementGeographicalAxis
= fur_MemphisMember
 
Atlanta Georgia [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Impairment charges           1,738,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementGeographicalAxis
= fur_AtlantaGeorgiaMember
     
Denton Texas [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Impairment charges           824,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementGeographicalAxis
= fur_DentonTexasMember
     
Equity Investments [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Impairment charge on equity investments   2,422,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquitySecuritiesMember
  7,687,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquitySecuritiesMember
  0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquitySecuritiesMember
     
Impairment charges   0us-gaap_AssetImpairmentCharges
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquitySecuritiesMember
  0us-gaap_AssetImpairmentCharges
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquitySecuritiesMember
  0us-gaap_AssetImpairmentCharges
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquitySecuritiesMember
     
Real Estate Investment [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Impairment charges   9,287,000us-gaap_AssetImpairmentCharges
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_RealEstateInvestmentMember
  2,904,000us-gaap_AssetImpairmentCharges
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_RealEstateInvestmentMember
  3,260,000us-gaap_AssetImpairmentCharges
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_RealEstateInvestmentMember
     
Louisville, Kentucky [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Property impairment charges                 87,000us-gaap_ImpairmentOfRealEstate
/ invest_InvestmentGeographicRegionAxis
= fur_LouisvilleKentuckyMember
Jacksonville, Florida [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Property impairment charges 200,000us-gaap_ImpairmentOfRealEstate
/ invest_InvestmentGeographicRegionAxis
= fur_JacksonvilleFloridaMember
               
Minimum [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Discount rate           6.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Terminal capitalization rate 8.50%fur_FairValueInputsTerminalCapitalizationRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
        0.00%fur_FairValueInputsTerminalCapitalizationRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Discount rate           10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Terminal capitalization rate 10.00%fur_FairValueInputsTerminalCapitalizationRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
               
Fair Value, Measurements, Nonrecurring [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Property impairment charges   9,287,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  2,904,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  3,260,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
     
Impairment charge on equity investments   2,422,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  7,687,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
  0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
     
Lisle, Illinois Property Sale [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Property impairment charges 8,500,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_OtherCommitmentsAxis
= fur_LisleIllinoisPropertySaleMember
               
Greensboro, North Carolina Sale [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Property impairment charges 500,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_OtherCommitmentsAxis
= fur_GreensboroNcMember
               
Occupancy [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Property impairment charges       2,750,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_OtherCommitmentsAxis
= fur_OccupancyMember
         
Significant Unobservable Inputs (Level 3) [Member]                  
Financial Instruments And Fair Value Measurements [Line Items]                  
Loan securities carried at fair value   $ 226,000us-gaap_SecuritiesLoanedAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
             
Loan security face value   20.00%fur_PercentageOfFairValueToBeConsideredForLoanSecurityValuation
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member