SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Lessor Disclosure) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) lease facility	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessor, Lease, Description [Line Items]
Unamortized direct costs related to origination of direct financing leases	$ 0	$ 0
Number of real estate properties | facility	987
Number of leases accounted for direct finance leases | lease	2
Operating Lease, Lease Income [Abstract]
Interest income - direct financing leases	$ 1,036
Rental income - operating leases	792,010
Variable lease income - operating leases	12,066
Total lease income	804,076	$ 767,340	$ 775,176
Lessor, Lease, Lease Expenses [Abstract]
Real estate taxes	14,933
General and administrative - ground lease expense	1,208
Total	16,141
Estimated contractual rents due under operating leases
2020	864,027
2021	884,432
2022	866,163
2023	860,369
2024	866,551
Thereafter	4,944,117
Total	$ 9,285,659
Maximum
Lessor, Lease, Description [Line Items]
Operating leases initial term (in years)	15 years
Minimum
Lessor, Lease, Description [Line Items]
Operating leases initial term (in years)	5 years