SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of period	$ 7,746,410	$ 7,655,960	$ 7,566,358
Acquisitions through foreclosure	143,753
Acquisitions	1,201,924	294,202	419,333
Impairment	(48,939)	(35,014)	(98,672)
Improvements	170,997	187,408	116,786
Disposals/other	(228,151)	(356,146)	(347,845)
Balance at close of period	8,985,994	7,746,410	7,655,960
Reconciliation of real estate accumulated depreciation
Balance at beginning of period	1,562,619	1,376,828	1,240,336
Provisions for depreciation	301,177	280,871	287,189
Dispositions/other	(76,371)	(95,080)	(150,697)
Balance at close of period	$ 1,787,425	$ 1,562,619	$ 1,376,828