Real Estate Activities - Summary of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans [Line Items]
Loans, Balance	$ 1,586,520	$ 1,928,524
Mortgage Loans [Member]
Loans [Line Items]
Loans, Balance	$ 1,213,322	$ 1,778,316
Loans, Weighted Average Interest Rate	8.80%	8.30%
Acquisition Loans [Member]
Loans [Line Items]
Loans, Balance	$ 3,454	$ 118,448
Loans, Weighted Average Interest Rate	10.80%	13.80%
Working Capital and Other Loans [Member]
Loans [Line Items]
Loans, Balance	$ 369,744	$ 31,760
Loans, Weighted Average Interest Rate	5.40%	7.60%