SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Lessee Disclosure) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) facility	Dec. 31, 2018 facility
Lessee, Lease, Description [Line Items]
Lease, Practical Expedients, Package [true false]	true
Number of real estate properties | facility	987
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Lessee, Operating Lease, Existence of Option to Terminate [true false]	true
Assets and Liabilities, Lessee [Abstract]
Operating lease, right-of-use asset	$ 17,533
Operating lease liabilities	18,033
Operating lease cost
Lease expense	2,110
Variable lease expense	129
Total lease expense	2,239
Rental income - ground lease income	842
Cash paid for amounts included in the measurement of lease liabilities	$ 1,949
Weighted average remaining lease term (in years)	28 years
Weighted average discount rate	5.25%
Future Rental Payments
2020	$ 1,847
2021	1,878
2022	1,922
2023	1,967
2024	2,012
Thereafter	34,002
Total	43,628
Accretion of Lease Liability
2020	(929)
2021	(879)
2022	(824)
2023	(764)
2024	(699)
Thereafter	(21,500)
Total	(25,595)
Total
2020	918
2021	999
2022	1,098
2023	1,203
2024	1,313
Thereafter	12,502
Total	$ 18,033
Office leases
Lessee, Lease, Description [Line Items]
Initial lease term (in years)	10 years
Skilled Nursing Facilities
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility	784	12
Skilled Nursing Facilities | Ground and/or Facility Leases [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility	11
Office Building [Member] | Ground and/or Facility Leases [Member]
Lessee, Lease, Description [Line Items]
Number of real estate properties | facility	2
Maximum
Lessee, Lease, Description [Line Items]
Percentage of annual increase over prior year's rent	3.00%
Maximum | Ground leases
Lessee, Lease, Description [Line Items]
Initial lease term (in years)	100 years
Minimum
Lessee, Lease, Description [Line Items]
Percentage of annual increase over prior year's rent	1.00%
Minimum | Ground leases
Lessee, Lease, Description [Line Items]
Initial lease term (in years)	10 years