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Acquisition and Disposition Activities - Intangible Assets Acquired and Intangible Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Mar. 05, 2014
Mar. 05, 2014
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, carrying value $ 10,773us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles $ 10,773us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period 5 years 10 months 24 days  
In Place Lease Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, carrying value 7,059us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
7,059us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period 5 years  
Above Market Lease Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, carrying value 1,769us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
1,769us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period 8 years 8 months 12 days  
Lease Commissions, Legal and Marketing Fees [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, carrying value 1,945us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fur_LeaseCommissionsLegalAndMarketingFeesMember
1,945us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fur_LeaseCommissionsLegalAndMarketingFeesMember
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period 5 years  
Below Market Lease Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, carrying value $ (8,595)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fur_BelowMarketLeaseMember
$ (8,595)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fur_BelowMarketLeaseMember
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period 8 years 8 months 12 days