SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Narrative 1) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 885,313	$ 773,563	$ 710,858
Additions during period - new mortgage loans or additional fundings	93,891	149,957	129,108
Deductions during period - collection of principal/other	(103,761)	(9,867)	(66,403)
Allowance for credit loss on mortgage loans	(40,357)	(28,340)
Balance at close of period	835,086	885,313	773,563
Mortgage loans on real estate non cash interest paid-in kind	200	600	300
Mortgage loans on real estate non cash deed-in-lieu of foreclosure			11,900
Non-cash placement of mortgage capital	7,000	$ 86,936	$ 0
Noncash principal reduction of mortgages	$ 58,600