Real Estate and Lending Activities - Monroe Facility - Additional Information (Detail) (USD $)	9 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended	1 Months Ended
	Sep. 30, 2014	Jul. 31, 2014 Monroe Facility [Member]	Jun. 30, 2014 Monroe Facility [Member]	Mar. 31, 2014 Monroe Facility [Member]	Sep. 30, 2014 Monroe Facility [Member]	Dec. 31, 2010 Monroe Facility [Member]	Oct. 31, 2014 Monroe Facility [Member] Subsequent Event [Member]
Significant Acquisitions and Disposals [Line Items]
Impairment of working capital loan recognized						$ 12,000,000
Impairment charges	50,128,000		26,500,000	20,500,000
Cash rents		2,100,000
Amount of bankruptcy claims settled					5,000,000
Amount paid in settlement of bankruptcy claims					2,500,000		1,000,000
Net investment					$ 27,500,000