LEASES (Narrative) (Detail) $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 11, 2019 USD ($) facility	Mar. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) facility Office property	Dec. 31, 2020 USD ($) facility	Dec. 31, 2019 USD ($) facility	Dec. 31, 2019 USD ($) facility	Jan. 01, 2022 facility	Jan. 31, 2019 USD ($)	Jan. 16, 2019 facility
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			960
Other investments, gross			$ 1,459,368
Other assets			138,804	$ 82,231
(Recovery) impairment on direct financing leases			(717)	(3,079)		$ 7,917
Proceeds from other investments			111,109	149,866		91,281
Orianna
Lessee, Lease, Description [Line Items]
Interest rate	6.00%
Other investments, gross	$ 30,000
Direct Financing Leases [Member] | Orianna
Lessee, Lease, Description [Line Items]
Interest rate								6.00%
Cash consideration sale of productive assets				17,200
Other investments, gross								$ 30,000
(Recovery) impairment on direct financing leases			(700)	(3,100)
Ground Leases and/or Facility Leases [Member] | General and Administrative Expense [Member]
Lessee, Lease, Description [Line Items]
Operating lease expenses			$ 2,200	$ 2,200		$ 2,200
Facilities Sold
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			48	43	34	34
Facilities Acquired | Subsequent Event [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility							1
Facilities Held for Sale or Closed [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			41
Skilled Nursing Facilities [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			685
Skilled Nursing Facilities [Member] | Ground Leases and/or Facility Leases [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | property			11
Skilled Nursing Facilities [Member] | Facilities Sold | Orianna | Distribution Trust [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility									15
Skilled Nursing Facilities [Member] | Facilities Acquired
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			6	8	89	89
Assisted Living Facilities [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			133
Assisted Living Facilities [Member] | Facilities Acquired
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility			19	3	4	4
15 Skilled Nursing Facilities [Member] | Orianna
Lessee, Lease, Description [Line Items]
Cash consideration sale of productive assets	146,000
15 Skilled Nursing Facilities [Member] | Direct Financing Leases [Member] | Orianna
Lessee, Lease, Description [Line Items]
Aggregate consideration	176,000
Cash consideration sale of productive assets					$ 94,000
Other assets					$ 14,100	$ 14,100		$ 115,800
(Recovery) impairment on direct financing leases		$ 7,700
Proceeds from other investments	$ 25,000
15 Skilled Nursing Facilities [Member] | Facilities Sold | Direct Financing Leases [Member] | Orianna
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility	15
Office leases | Ground Leases and/or Facility Leases [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | Office			2