SUMMARY OF QUARTERLY RESULTS (UNAUDITED) (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Provisions for uncollectible accounts and impairment losses on real estate properties and direct financing leases	$ 35,900	$ 3,800	$ 5,700	$ 7,700	$ 30,600	$ 20,900	$ (500)	$ 12,700
Net gain (loss) on assets sold	$ 2,900	$ 53,100	$ (300)	$ 3	$ 15,500	$ (5,400)	$ (2,900)	$ 17,500	$ 55,696	$ 24,774	$ 53,912