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OTHER INVESTMENTS (Note Due 2021 Narrative) (Detail) - USD ($) $ in Thousands	Jul. 29, 2016	Dec. 31, 2019	Dec. 31, 2018	Mar. 06, 2018	Feb. 22, 2018
Schedule of Investments [Line Items]
Other investments		$ 419,228	$ 504,626
Other Investment Note Due 2021 [Member]
Schedule of Investments [Line Items]
Debt instrument, interest rate, stated percentage		13.09%
Other investments, gross		$ 77,087	$ 71,036
Genesis HealthCare \| Other Investment Note Due 2021 [Member]
Schedule of Investments [Line Items]
Other investments, gross		77,100
Loans Receivable Fixed Rate					14.00%
Loans Receivable Interest Paid-In-Kind					9.00%
Genesis HealthCare \| Other Investment Note Due 2021 First Loan [Member]
Schedule of Investments [Line Items]
Financing receivable, face amount	$ 48,000
Other investments		59,600
Investment Maturity Date	Jul. 29, 2020
Genesis HealthCare \| Other Investment Note Due 2021 First Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Schedule of Investments [Line Items]
LIBOR with floor rate	1.00%
Basis spread on variable rate	13.00%
Genesis HealthCare \| Other Investment Note Due 2021 Second Loan [Member]
Schedule of Investments [Line Items]
Financing receivable, face amount				$ 16,000
Other investments		$ 17,500
Loans Receivable Fixed Rate				10.00%
Loans Receivable Interest Paid-In-Kind				5.00%
Investment Maturity Date				Jul. 29, 2020
Genesis HealthCare \| Debt Instrument, Redemption, Period One [Member] \| Other Investment Note Due 2021 Second Loan [Member]
Schedule of Investments [Line Items]
Notes Receivable Principal Payment	$ 250
Genesis HealthCare \| Debt Instrument, Redemption, Period Two [Member] \| Other Investment Note Due 2021 Second Loan [Member]
Schedule of Investments [Line Items]
Principal payments	$ 500