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Fair Value Measurements - Difference Between Fair Values and Aggregate Contractual Amounts (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value at July 31, 2014 $ 226us-gaap_SecuritiesLoanedAsset $ 226us-gaap_SecuritiesLoanedAsset
Amount Due Upon Maturity 1,130fur_LoanSecuritiesMaturityAmount  
Difference 904fur_LoanSecuritiesDifferenceBetweenFairValuesAndAggregateContractualAmounts  
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value at July 31, 2014 226us-gaap_SecuritiesLoanedAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 226us-gaap_SecuritiesLoanedAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Amount Due Upon Maturity 1,130fur_LoanSecuritiesMaturityAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		  
Difference $ 904fur_LoanSecuritiesDifferenceBetweenFairValuesAndAggregateContractualAmounts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember