Equity Investments - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014 WRT-Elad Equity/Lender (Sullivan Center) [Member]	Mar. 31, 2014 701 7th WRT Investors LLC [Member]	Mar. 31, 2013 701 7th WRT Investors LLC [Member]	Jun. 30, 2014 CDH CDO LLC [Member]	Jun. 30, 2013 CDH CDO LLC [Member]	Jun. 30, 2014 CDH CDO LLC [Member]	Jun. 30, 2013 CDH CDO LLC [Member]	May 31, 2014 WRT One South State Lender LP [Member]	May 31, 2013 WRT One South State Lender LP [Member]	May 31, 2014 WRT One South State Lender LP [Member]	May 31, 2013 WRT One South State Lender LP [Member]	May 31, 2014 Vintage Housing Holdings [Member]	May 31, 2013 Vintage Housing Holdings [Member]	May 31, 2014 Vintage Housing Holdings [Member]	May 31, 2013 Vintage Housing Holdings [Member]	Jun. 30, 2014 Concord Debt Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Difference in carrying value of investments	$ 9,909,000
Revenues		0	0	3,517,000	5,038,000	7,062,000	10,075,000	2,527,000	2,097,000	4,999,000	3,936,000	12,345,000	10,824,000	24,026,000	21,403,000
Net income (loss)		0	0	(9,149,000)	3,309,000	(5,803,000)	9,269,000	2,527,000	2,065,000	4,999,000	3,870,000	3,602,000	4,068,000	5,356,000	7,422,000
Cash distributions amount				984,000		984,000										515,000
Net income loss						$ 18,358,000										$ 40,403,000