Future Minimum Lease Payments - Additional Information (Detail)	12 Months Ended
Dec. 31, 2018
Westinghouse Electric [Member]
Future Minimum Leases Payments Under Leases [Line Items]
Total contribution of base commercial rental	53.90%

Line items used to disclose Future Minimum Leases Payments Under Leases.

No definition available.

Name:	fur_FutureMinimumLeasesPaymentsUnderLeasesLineItems
Namespace Prefix:	fur_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration