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Schedule IV - Mortgage Loans on Real Estate (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]  
Face Value $ 22,607,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
Outstanding Principal 22,607,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
Carrying Amount 24,005,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages [1]
Mezzanine [Member] | Chicago And Norridge Illinois [Member]  
Mortgage Loans on Real Estate [Line Items]  
Location Chicago, IL Norridge, IL
Contractual Maturity Date Mar. 09, 2017
Periodic Payment Terms Interest Only
Face Value 15,500,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoAndNorridgeIllinoisMember
Outstanding Principal 15,500,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoAndNorridgeIllinoisMember
Carrying Amount 18,690,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoAndNorridgeIllinoisMember		 [1]
Loan bearing interest, terms LIBOR + 12 %
Mezzanine [Member] | Rockwell [Member]  
Mortgage Loans on Real Estate [Line Items]  
Location Rockwell, NY
Contractual Maturity Date May 01, 2016
Periodic Payment Terms Interest Only
Senior Liens 16,342,000us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_RockwellMember
Face Value 1,486,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_RockwellMember
Outstanding Principal 1,486,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_RockwellMember
Interest of loan 12.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_MezzanineMember
/ us-gaap_StatementGeographicalAxis
= fur_RockwellMember
Whole Loan [Member] | Chicago [Member]  
Mortgage Loans on Real Estate [Line Items]  
Interest of loan 10.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_WholeLoanMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoMember
Whole Loan [Member] | Churchill [Member]  
Mortgage Loans on Real Estate [Line Items]  
Location Churchill, PA
Contractual Maturity Date Jun. 01, 2015
Periodic Payment Terms Interest Only
Face Value 333,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_WholeLoanMember
/ us-gaap_StatementGeographicalAxis
= fur_ChurchillMember
Outstanding Principal 333,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_WholeLoanMember
/ us-gaap_StatementGeographicalAxis
= fur_ChurchillMember
Loan bearing interest, terms LIBOR + 3.75 %
Whole Loan [Member] | Chicago, IL [Member]  
Mortgage Loans on Real Estate [Line Items]  
Location Chicago, IL
Contractual Maturity Date Sep. 10, 2017
Periodic Payment Terms Interest Only
Face Value 2,497,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_WholeLoanMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoIlMember
Outstanding Principal 2,497,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_WholeLoanMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoIlMember
Carrying Amount 2,511,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_WholeLoanMember
/ us-gaap_StatementGeographicalAxis
= fur_ChicagoIlMember		 [1]
B-Note Other [Member] | Kauai HI [Member]  
Mortgage Loans on Real Estate [Line Items]  
Location Kauai, HI
Contractual Maturity Date Jan. 06, 2017
Periodic Payment Terms Amortizing
Senior Liens 28,272,000us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_BNoteOtherMember
/ us-gaap_StatementGeographicalAxis
= fur_KauaiMember
Face Value 2,791,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_BNoteOtherMember
/ us-gaap_StatementGeographicalAxis
= fur_KauaiMember
Outstanding Principal 2,791,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_BNoteOtherMember
/ us-gaap_StatementGeographicalAxis
= fur_KauaiMember
Carrying Amount $ 2,804,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_BNoteOtherMember
/ us-gaap_StatementGeographicalAxis
= fur_KauaiMember		 [1]
Interest of loan 6.658%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= fur_BNoteOtherMember
/ us-gaap_StatementGeographicalAxis
= fur_KauaiMember
[1] Carrying amount represents the estimated amount expected to be collected on disposition of the loan, plus contractual interest receivable at December 31, 2014.