Fair Value Measurements - Difference Between Fair Values and the Aggregate Contractual Amounts (Detail) (Loan Securities Carried at Fair Value [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Loan Securities Carried at Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Fair Value at September 30, 2013	$ 226
Amount Due Upon Maturity	1,130
Difference	$ 904

Loan securities difference between fair values and the aggregate contractual amounts.

No definition available.

Name:	fur_LoanSecuritiesDifferenceBetweenFairValuesAndAggregateContractualAmounts
Namespace Prefix:	fur_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant