Future Minimum Lease Payments - Additional Information (Detail)	12 Months Ended
Dec. 31, 2014 Tenants	Dec. 31, 2013 Tenants	Dec. 31, 2012 Tenants
Leases [Abstract]
Total contribution of base rental		12.10%fur_AggregateContributionOfBaseRental	19.70%fur_AggregateContributionOfBaseRental
Percentage of rentable square footage by tenant		16.70%	17.50%
Number of tenants	0fur_NumberOfTenants	1fur_NumberOfTenants	1fur_NumberOfTenants

Entity wide revenue major customer as percentage of rentable area.

No definition available.

Name:	fur_EntityWideRevenueMajorCustomerAsPercentageOfRentableArea
Namespace Prefix:	fur_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration