Reportable Segments - Summary of Assets by Business Segment (Detail) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Net Reportable Segments [Member]	Dec. 31, 2012 Net Reportable Segments [Member]
Assets
Operating properties					$ 845,698,000	$ 562,822,000
Loan assets					147,702,000	239,534,000
REIT securities		19,694,000				19,694,000
Cash and cash equivalents	112,512,000	97,682,000	40,952,000	45,257,000	112,512,000	97,682,000
Restricted cash	13,372,000	13,250,000			186,000
Accounts receivable and prepaids					543,000	336,000
Deferred financing costs					2,645,000	3,095,000
Discontinued operations	23,038,000				23,038,000
TOTAL ASSETS	1,132,324,000	923,163,000			1,132,324,000	923,163,000
Capital Expenditures
Operating Properties					$ 3,892,000	$ 12,417,000