Real Estate and Loans Receivable - Summary of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans [Line Items]
Loans, Balance	$ 1,216,121	$ 1,422,403
Mortgage Loans [Member]
Loans [Line Items]
Loans, Balance	$ 1,060,400	$ 757,581
Loans, Weighted Average Interest Rate	8.80%	9.50%
Acquisition Loans [Member]
Loans [Line Items]
Loans, Balance	$ 121,464	$ 610,469
Loans, Weighted Average Interest Rate	13.70%	9.10%
Working Capital and Other Loans [Member]
Loans [Line Items]
Loans, Balance	$ 34,257	$ 54,353
Loans, Weighted Average Interest Rate	9.00%	10.20%