VARIABLE INTEREST ENTITIES (Schedule of Variable Interest Entities) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Assets
Real estate assets - net		$ 6,789,091	$ 6,789,091	$ 6,705,240
Assets held for sale		261,151	261,151	81,452
Other investments - net		469,884	469,884	467,442	$ 419,228	$ 412,540
Contractual receivables - net		11,259	11,259	10,408
Lease inducements		93,770	93,770	83,425
Total assets		9,638,478	9,638,478	9,497,449
Liabilities
Total liabilities		5,530,252	5,530,252	5,460,842
Rental income			923,677	753,427	804,076
Other investment income			44,721	44,864	43,400
Total revenues			1,062,809	892,381	928,830
Provision of of straight-line rent and contractual receivables					11,100
Other Investment Receivables [Member]
Assets
Other investments - net		469,884	469,884	467,442
Maplewood Real Estate Holdings
Assets
Lease inducements				23,900
Variable Interest Entity, Not Primary Beneficiary [Member]
Assets
Real estate assets - net		1,144,851	1,144,851	1,121,498
Assets held for sale		191,016	191,016
Other investments - net		230,768	230,768	181,401
Contractual receivables - net		1,227	1,227	1,233
Straight-line rent receivables		(41,512)	(41,512)	(56,664)
Lease inducements		64,307	64,307	69,666
Total assets		1,590,657	1,590,657	1,317,134
Liabilities
Net in-place lease liability		305	305	331
Security deposit		4,715	4,715
Contingent liability		43,915	43,915	43,915
Total liabilities		48,935	48,935	44,246
Maximum exposure to loss		157,855	157,855	94,137
Total revenues			135,717	41,919	109,073
Pledged accounts receivable with second priority security interest		29,200	29,200
Variable Interest Entity, Not Primary Beneficiary [Member] | Rental Income [Member]
Liabilities
Rental income			120,381	30,055	99,750
Variable Interest Entity, Not Primary Beneficiary [Member] | Investment Income [Member]
Liabilities
Other investment income			15,336	11,864	$ 9,323
Variable Interest Entity, Not Primary Beneficiary [Member] | Letters of credit
Liabilities
Letter of Credit held as collateral				(9,253)
Variable Interest Entity, Not Primary Beneficiary [Member] | Personal Guarantee Collateral [Member]
Liabilities
Amount of other collateral		(48,000)	(48,000)	(48,000)
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Collateral [Member]
Liabilities
Amount of other collateral		(1,335,867)	(1,335,867)	(1,121,498)
Variable Interest Entity, Not Primary Beneficiary [Member] | Collateral Pledged [Member]
Liabilities
Amount of other collateral		(1,383,867)	$ (1,383,867)	(1,178,751)
Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member]
Liabilities
Provision of of straight-line rent and contractual receivables				75,300
Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member] | Operator Placed On Cash Basis [Member]
Liabilities
Total revenues		$ 8,700
Provision of of straight-line rent and contractual receivables	$ 75,300
Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member] | Other Investment Note Due 2025 Working Capital Loan [Member]
Liabilities
Pledged accounts receivable with second priority security interest				$ 25,000