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Securities and Loan Securities Carried at Fair Value - Securities and Loan Securities Carried at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jul. 31, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]      
Assets measured at fair value on a recurring basis / Liquidation Value   $ 226us-gaap_SecuritiesLoanedAsset $ 226us-gaap_SecuritiesLoanedAsset
Cost 161fur_CostOfSecurities   161fur_CostOfSecurities
Fair Value     226fur_FairValueOfSecurities
Loan Securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Cost 161fur_CostOfSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= fur_LoanSecuritiesMember		   161fur_CostOfSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= fur_LoanSecuritiesMember
Fair Value     226fur_FairValueOfSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= fur_LoanSecuritiesMember
Liquidation Value [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Assets measured at fair value on a recurring basis / Liquidation Value 918us-gaap_SecuritiesLoanedAsset
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember		    
Liquidation Value [Member] | Loan Securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Assets measured at fair value on a recurring basis / Liquidation Value $ 918us-gaap_SecuritiesLoanedAsset
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= fur_LoanSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_LiquidationBasisOfAccountingMember