Related-Party Transactions - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Related Party Transaction [Line Items]
Management fees	$ 15,448,000
Termination fees	9,496,000
Incentive fees	11,219,000
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	2,296,000
Winthrop Management LP [Member]
Related Party Transaction [Line Items]
Payable to related parties included in related party fees payable	$ 301,000