Consolidated Statement of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Income Statement [Abstract]
Net assets in liquidation, December 31, 2014	$ 594,704us-gaap_AssetsNet
Changes in net assets in liquidation
Change in liquidation value of investments in real estate	3,975
Change in liquidation value of loan securities	(918)fur_IncreaseDecreaseInLoansReceivable
Change in liquidation value of equity investments	2,733
Remeasurement of assets and liabilities	(3,724)
Remeasurement of non-controlling interests	400
Changes in net assets in liquidation	2,466fur_ChangeInNetAssetsInLiquidation
Net assets in liquidation, March 31, 2015	597,170us-gaap_AssetsNet
Revenue
Rents and reimbursements	19,063us-gaap_RealEstateRevenueNet
Interest, dividends and discount accretion	5,497
Total Revenue	24,560us-gaap_Revenues
Expenses
Property operating	7,433
Real estate taxes	2,195us-gaap_RealEstateTaxExpense
Depreciation and amortization	7,229us-gaap_DepreciationAndAmortization
Interest	5,693us-gaap_InterestExpense
Impairment loss on investments in real estate	9,200us-gaap_ImpairmentOfRealEstate
General and administrative	1,642us-gaap_GeneralAndAdministrativeExpense
Related party fees	2,375us-gaap_RelatedPartyCosts
Transaction costs	250
State and local taxes	12
Total expenses	36,029us-gaap_CostsAndExpenses
Other income
Equity in income of equity investments	6,194
Earnings from preferred equity investments	7
Realized gain on sale of securities carried at fair value	2us-gaap_GainLossOnSaleOfSecuritiesNet
Interest and other income	85us-gaap_InterestAndOtherIncome
Total other income (loss)	6,288us-gaap_OtherNonoperatingIncomeExpense
Loss from continuing operations	(5,181)
Discontinued operations
Income from discontinued operations	4,379
Net loss	(802)us-gaap_ProfitLoss
Net loss attributable to non-controlling interest	1,443
Net income attributable to Winthrop Realty Trust	641us-gaap_NetIncomeLoss
Preferred dividend of Series D Preferred Shares	(2,787)us-gaap_DividendsPreferredStock
Amount allocated to Restricted Common Shares	(96)us-gaap_DividendsShareBasedCompensation
Net loss attributable to Common Shares	(2,242)
Per Common Share data - Basic
Loss from continuing operations	$ (0.18)
Income from discontinued operations	$ 0.12
Net loss attributable to Common Shares	$ (0.06)us-gaap_EarningsPerShareBasic
Per Common Share data - Diluted
Loss from continuing operations	$ (0.18)
Income from discontinued operations	$ 0.12
Net loss attributable to Common Shares	$ (0.06)us-gaap_EarningsPerShareDiluted
Basic Weighted-Average Common Shares	35,816
Diluted Weighted-Average Common Shares	35,816
Comprehensive income
Net loss	(802)us-gaap_ProfitLoss
Change in unrealized loss on interest rate derivative	(145)
Consolidated comprehensive loss	(947)
Net loss attributable to non-controlling interest	1,443
Comprehensive loss attributable to non-controlling interest	1,443
Comprehensive income attributable to Winthrop Realty Trust	$ 496us-gaap_ComprehensiveIncomeNetOfTax

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