SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Narrative 1) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 671,232	$ 639,343	$ 679,795
Additions during period - new mortgage loans or additional fundings	65,841	34,643	48,722
Deductions during period - collection of principal/other	(26,215)	(2,754)	(89,174)
Balance at close of period	710,858	671,232	639,343
Mortgage loans on real estate non cash interest paid-in kind	500
Mortgage loans on real estate non cash deed-in-lieu of foreclosure			$ 29,200
Amortizatoin of premium	100	$ 1,200
Mortgage Loans on Real Estate, Renewed and Extended, Amount	$ 144,800