Receivables - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Elad Canada Inc [Member]	Sep. 30, 2013 WRT-Elad One South State Lender LP [Member]	Aug. 21, 2013 WRT-Elad One South State Lender LP [Member]	Sep. 30, 2013 WRT-Elad One South State Lender LP [Member] Elad Canada Inc [Member]	Sep. 30, 2013 WRT-Elad One South State Equity LP [Member]	Sep. 30, 2013 WRT-Elad One South State Equity LP [Member]	Sep. 30, 2013 WRT-Elad One South State Equity LP [Member] Elad Canada Inc [Member]	Sep. 30, 2013 Recourse Secured Financings [Member]	Dec. 31, 2012 Recourse Secured Financings [Member]
Receivables [Line Items]
Loans receivable accrued interest	$ 563,000		$ 563,000		$ 1,016,000
Cumulative accretion of loans receivable	4,773,000		4,773,000		2,527,000
Loans receivable, exclusive of interest receivable	7,620,000		7,620,000		9,865,000
Weighted average coupon rate on loans receivable			6.90%		7.65%
Weighted average yield to maturity			11.88%		11.43%
Non recourse secured financings	29,150,000		29,150,000		29,150,000
Secured financings	29,150,000		29,150,000		52,920,000								23,770,000	23,770,000
Non performing loans	0		0		0
Past due payments	0		0		0
Provision for loan loss	0		0
Nominal % Ownership							50.00%	50.00%	50.00%			50.00%
Secured financing receivable	30,395,000		30,395,000				30,000,000
Interest income	$ 101,000	$ 242,000	$ 286,000	$ 433,000						$ 395,000	$ 395,000
Period for the return of Asset						2 years
Annual Interest rate						15.00%