ALLOWANCE FOR CREDIT LOSSES (Schedule of expected credit loss per segment) (Detail) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2021 USD ($) facility	Sep. 30, 2021 USD ($) facility	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) facility	Dec. 31, 2020 USD ($)	May 07, 2018 USD ($)	Sep. 30, 2016 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				$ 67,841	$ 28,785
Provision (Recovery) for Credit Losses				76,720	34,151
Write-offs charged against allowance for the period ended				(95)	(217)
ECL Ending balance	$ 144,466			144,466	67,841
Mortgage notes receivable	$ 1,459,368			$ 1,459,368
Number of real estate properties | facility	960			960
Gulf Coast LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses				$ 20,000
Allowance for credit loss increase (decrease)	$ 20,000
Off Balance Financing Receivable Segment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				2,445	100
Provision (Recovery) for Credit Losses				(1,504)	2,345
ECL Ending balance	941			941	2,445
Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				33,245	21,386
Provision (Recovery) for Credit Losses				40,356	6,954
ECL Ending balance	73,601			73,601	33,245
Mortgage notes receivable	908,687			908,687	918,558
Mortgage Receivable [Member] | Mortgage Note Due 2027 [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Mortgage notes receivable	103,762			103,762	112,500
Mortgage Receivable [Member] | Facilities With Movement in Credit Rating [Member] | Mortgage Note Due 2027 [Member] | 9 Facilities [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Number of real estate properties | facility		9
Direct Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				694	611
Provision (Recovery) for Credit Losses				(164)	83
Write-offs charged against allowance for the period ended					(217)
ECL Ending balance	530			530	694
Mortgage notes receivable	11,403			11,403
Other Investment Receivables [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				31,457	6,688
Provision (Recovery) for Credit Losses				38,032	24,769
Write-offs charged against allowance for the period ended				(95)
ECL Ending balance	69,394			69,394	31,457
Mortgage notes receivable	539,278			539,278	498,899
Other Investment Note Due 2024 Through 2025 [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Mortgage notes receivable	55,791			55,791	56,987
Other Investment Note Due 2024 Through 2025 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses		$ 16,700	$ 22,700
Other Investment Note Due 2024 Term Loan [Member] | Agemo Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss increase (decrease)		8,800
Other Investment Note Due 2024 Term Loan [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Mortgage notes receivable							$ 32,000
Other Investment Note Due 2025 Working Capital Loan [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Mortgage notes receivable						$ 25,000
Accrued Interest Reserved Through Credit Loss [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses			$ 3,800		3,800
Previously Reported [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance					5,122
Previously Reported [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance					4,905
Previously Reported [Member] | Direct Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance					217
Internal Credit Rating One [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Mortgage notes receivable	65,475			65,475
Internal Credit Rating Two [Member] | Off Balance Sheet Financing Receivable Segment Note Commitment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				116
Provision (Recovery) for Credit Losses				(109)	116
ECL Ending balance	7			7	116
Internal Credit Rating Two [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				88
Provision (Recovery) for Credit Losses				(73)	88
ECL Ending balance	15			15	88
Mortgage notes receivable	21,325			21,325
Internal Credit Rating Two [Member] | Other Investment Receivables [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				94	195
Provision (Recovery) for Credit Losses				(65)	(101)
ECL Ending balance	29			29	94
Mortgage notes receivable	21,500			21,500
Internal Credit Rating Three [Member] | Off Balance Sheet Financing Receivable Segment Note Commitment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				2,305
Provision (Recovery) for Credit Losses				(1,847)	2,305
ECL Ending balance	458			458	2,305
Internal Credit Rating Three [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				954	901
Provision (Recovery) for Credit Losses				1,019	53
ECL Ending balance	1,973			1,973	954
Mortgage notes receivable	72,420			72,420
Internal Credit Rating Three [Member] | Direct Financing Receivable [Member] | Finance Leases Portfolio Segment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				694	611
Provision (Recovery) for Credit Losses				(164)	83
Write-offs charged against allowance for the period ended					(217)
ECL Ending balance	530			530	694
Mortgage notes receivable	11,403			11,403
Internal Credit Rating Three [Member] | Other Investment Receivables [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				5,113	1,434
Provision (Recovery) for Credit Losses				(513)	3,679
ECL Ending balance	4,600			4,600	5,113
Mortgage notes receivable	286,790			286,790
Internal Credit Rating Three [Member] | Previously Reported [Member] | Direct Financing Receivable [Member] | Finance Leases Portfolio Segment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance					217
Internal Credit Rating Four [Member] | Off Balance Sheet Financing Receivable Segment Mortgage Commitment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				24	100
Provision (Recovery) for Credit Losses				93	(76)
ECL Ending balance	117			117	24
Internal Credit Rating Four [Member] | Off Balance Sheet Financing Receivable Segment Note Commitment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses				216
ECL Ending balance	216			216
Internal Credit Rating Four [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				26,865	19,293
Provision (Recovery) for Credit Losses				(7,404)	7,572
ECL Ending balance	19,461			19,461	26,865
Mortgage notes receivable	632,238			632,238
Internal Credit Rating Four [Member] | Mortgage Receivable [Member] | Mortgage Note Due 2027 [Member] | 9 Facilities [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Mortgage notes receivable		112,500
Internal Credit Rating Four [Member] | Other Investment Receivables [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				24,397	3,158
Provision (Recovery) for Credit Losses				(23,225)	21,239
ECL Ending balance	1,172			1,172	24,397
Mortgage notes receivable	145,533			145,533
Internal Credit Rating Four [Member] | Other Investment Note Due 2024 Term Loan and One Additional Loan [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss increase (decrease)		(27,200)
Internal Credit Rating Five [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				433	829
Provision (Recovery) for Credit Losses				(298)	(396)
ECL Ending balance	135			135	433
Mortgage notes receivable	7,090			7,090
Internal Credit Rating Five [Member] | Other Investment Receivables [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				1,853	1,901
Provision (Recovery) for Credit Losses				6,103	(48)
Write-offs charged against allowance for the period ended				(95)
ECL Ending balance	7,861			7,861	1,853
Mortgage notes receivable	29,723			29,723
Internal Credit Rating Five [Member] | Other Investment Note Due 2025 Working Capital Loan [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Agemo Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss increase (decrease)		$ 7,900
Internal Credit Rating Six [Member] | Mortgage Note Due 2027 [Member] | 7 Facilities [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses	38,200
Internal Credit Rating Six [Member] | Off Balance Sheet Financing Receivable Segment Mortgage Commitment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses				143
ECL Ending balance	143			143
Internal Credit Rating Six [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance				4,905	363
Provision (Recovery) for Credit Losses				47,112	(363)
ECL Ending balance	52,017			52,017	4,905
Mortgage notes receivable	110,139			110,139
Internal Credit Rating Six [Member] | Other Investment Receivables [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision (Recovery) for Credit Losses				55,732
ECL Ending balance	55,732			55,732
Mortgage notes receivable	$ 55,732			55,732
Internal Credit Rating Six [Member] | Other Investment Note Due 2024 Term Loan and One Additional Loan [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss increase (decrease)				$ 27,200
Internal Credit Rating Six [Member] | Previously Reported [Member] | Mortgage Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
ECL Beginning balance					$ 4,905