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Debt - Mortgage Loans Payable (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
LIBOR rate 0.17125%fur_DebtInstrumentLiborFloorRate 0.1677%fur_DebtInstrumentLiborFloorRate
3.50% Loan Due in May 2016 [Member]    
Debt Instrument [Line Items]    
Debt instrument basis spread on floor rate 1.00%fur_DebtInstrumentBasisSpreadOnFloorRate
/ us-gaap_LongtermDebtTypeAxis
= fur_ThreePointFivePercentDueMayTwoThousandSixteenMember		  
2.69% Loan Due in Oct 2016 [Member]    
Debt Instrument [Line Items]    
Mortgage loan, LIBOR rate 0.69%fur_InterestRateSwapAgreementInterestRate
/ us-gaap_LongtermDebtTypeAxis
= fur_TwoPointSixNinePercentLoanDueOctoberTwoThousandAndSixteenMember