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OTHER INVESTMENTS (Note Due 2020 Narrative) (Detail) - USD ($)	Mar. 06, 2018	Jul. 29, 2016	Dec. 31, 2018	Feb. 22, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Other investments, gross			$ 504,626,000		$ 276,715,000
Other investments			504,626,000		276,342,000
Orianna
Schedule of Investments [Line Items]
Other investments			$ 40,200,000
Other Investment Note Due 2020 [Member]
Schedule of Investments [Line Items]
Debt instrument, interest rate, stated percentage			13.06%
Other investments, gross			$ 71,036,000		$ 49,490,000
Other Investment Note Due 2020 [Member] \| Secured Term Loan [Member] \| Genesis HealthCare
Schedule of Investments [Line Items]
Financing receivable, face amount	$ 16,000,000
Other investments			16,600,000
Loans Receivable Fixed Rate	10.00%
Loans Receivable Interest Paid-In-Kind	5.00%
Investment Maturity Date	Jul. 29, 2020
Other Investment Note Due 2020 [Member] \| Secured Term Loan [Member] \| Genesis HealthCare \| London Interbank Offered Rate (LIBOR) [Member]
Schedule of Investments [Line Items]
Financing receivable, face amount		$ 48,000,000		$ 48,000,000
Other investments			$ 54,400,000
Loans Receivable Fixed Rate				14.00%
Loans Receivable Interest Paid-In-Kind				9.00%
Investment Maturity Date		Jul. 29, 2020
LIBOR with floor rate		1.00%
Basis Spread on Variable Rate		13.00%
Debt Instrument, Redemption, Period One [Member] \| Other Investment Note Due 2020 [Member] \| Secured Term Loan [Member] \| Genesis HealthCare \| London Interbank Offered Rate (LIBOR) [Member]
Schedule of Investments [Line Items]
Notes Receivable Principal Payment		$ 250,000.00
Debt Instrument, Redemption, Period Two [Member] \| Other Investment Note Due 2020 [Member] \| Secured Term Loan [Member] \| Genesis HealthCare \| London Interbank Offered Rate (LIBOR) [Member]
Schedule of Investments [Line Items]
Principal payments		$ 500,000