Related-Party Transactions (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012
FUR Advisors [Member]
Related Party Transaction [Line Items]
Base management fee	1.50%
Payable to related parties included in accounts payable and accrued liabilities	$ 2,316,000
Winthrop Management [Member]
Related Party Transaction [Line Items]
Base management fee	0.25%
Payable to related parties included in accounts payable and accrued liabilities	$ 67,000