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Equity Investments - Summarized Statements of Operations of Real Estate Equity Investments (Detail) (USD $)
In Thousands, unless otherwise specified
 7 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]      
Interest, dividends and discount accretion $ 9,643us-gaap_InterestAndDividendIncomeOperating $ 18,455us-gaap_InterestAndDividendIncomeOperating $ 21,123us-gaap_InterestAndDividendIncomeOperating
Expenses      
General and administrative 4,283us-gaap_GeneralAndAdministrativeExpense 4,356us-gaap_GeneralAndAdministrativeExpense 3,529us-gaap_GeneralAndAdministrativeExpense
SoCal [Member]      
Schedule of Equity Method Investments [Line Items]      
Interest, dividends and discount accretion     25,122us-gaap_InterestAndDividendIncomeOperating
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fur_SocalMember
Expenses      
Interest     7,794fur_EquityMethodInvestmentSummarizedFinancialInformationInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
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General and administrative     424us-gaap_GeneralAndAdministrativeExpense
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Other expenses     12us-gaap_OtherExpenses
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Total expense     8,230fur_EquityMethodInvestmentSummarizedFinancialInformationExpenses
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Income from continuing operations     16,892us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
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Trust's share of net income     $ 9,706fur_EquityMethodInvestmentShareInNetIncomeLoss
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