Related-Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
FUR Advisors [Member]
Related Party Transaction [Line Items]
Percentage of Equity contributions	1.50%
Percentage of Equity contributions by unaffiliated third parties	0.25%
Payable to related parties included in related party fees payable	$ 2,375,000
Winthrop Management LP [Member]
Related Party Transaction [Line Items]
Payable to related parties included in related party fees payable	$ 230,000