Subsequent Events (Details) (USD $)	1 Months Ended	12 Months Ended					1 Months Ended		1 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended
	Oct. 07, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 14, 2012	Feb. 17, 2012	Jan. 24, 2013 Subsequent Event [Member] Playa Vista Mezzanine Loan [Member] sqft	Mar. 01, 2013 Subsequent Event [Member] Playa Vista Mezzanine Loan [Member]	Mar. 08, 2013 Subsequent Event [Member] RE CDO Management [Member]	Feb. 20, 2013 Subsequent Event [Member] RE CDO Management [Member]	Dec. 31, 2012 Subsequent Event [Member] Queensridge Loan/Recourse Secured Financing [Member]	Jan. 01, 2013 Subsequent Event [Member] Advisory Agreement [Member]	Dec. 31, 2012 Subsequent Event [Member] Advisory Agreement [Member]
Subsequent Events (Textual) [Abstract]
Principal amount of the loan							$ 20,500,000
Maturity date of loan							Jan. 23, 2015
Office building area, square foot							260,000
LIBOR plus					10.00%	3.25%	14.25%
Mortgage loan		232,451,000					80,300,000
Mortgage loan, LIBOR floor rate							0.50%
Loan bears interest, description of variable rate basis	LIBOR + 1.25% with a 3% LIBOR floor	LIBOR + 3.75%	LIBOR plus 3.25%				0.50% LIBOR floor
Interest rate							8.25%
Percentage of sales proceeds							25.00%
Ownership interest							25.00%
Pari passu participation interest in the loan								50.00%
Proceeds from mortgage loans payable		36,897,000	32,494,000						6,240,000	2,750,000
Net proceeds from Collateralized debt obligation									3,120,000	1,296,000
Principal repayments											5,987,000
Aggregate principal payments		25,584,000	72,574,000	10,199,000							5,987,000
Term of advisory agreement												5 years
Percentage of growth rate on incentive fee												7.00%
Percentage of growth rate on incentive fee modification additional percentage												4.00%
Period for growth factor on incentive												5 years
Yield plus percentage												2.50%
Percentage of amount available for distribution in excess of threshold amount												20.00%
Threshold Amount													534,224,000
Supplemental fee payment terms description												payable if there is (i) a termination of the Advisory Agreement for any reason other than for cause (as defined) by the Trust or with cause by FUR Advisors, (ii) a disposition of all or substantially all of the Trust’s assets, or (iii) an election by the Trust to orderly liquidate its assets. The supplemental fee, if payable, is equal to the lesser of (i) the base management fee paid to FUR Advisors for the prior twelve month period or (ii) either (x) in the case of a termination of the Advisory Agreement, 20% of the positive difference, if any between (A) the appraised net asset value of the Trust’s assets at the date of termination and (B) the threshold amount less $104,980,000, or (y) in the case of a disposition or liquidation, 20% of any dividends paid on account of Common Shares at such time as the threshold amount is reduced to $104,980,000, which will be achieved at such time as aggregate distributions of approximately $13.00 in excess of the Growth Factor have been paid.
Percentage of positive difference between appraised net asset value and threshold amount on termination												20.00%
Reduced threshold amount												104,980,000
Percentage of dividends paid on disposition												20.00%
Aggregate distributions paid in excess of growth factor												$ 13.00
Base asset management fee													8,953,000
Aggregate dividend paid												$ 14.36
Supplemental fees payable												$ 3,000,000
Period of Supplemental Fees payment												30 days