MORTGAGE NOTES RECEIVABLE (Narrative) (Detail)	12 Months Ended
	Dec. 31, 2019 state facility property entity	Dec. 31, 2018 facility	Mar. 31, 2018 facility
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties	987
Number of states | state	40
Skilled Nursing Facilities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties	784	12
Skilled Nursing Facilities | Pennsylvania
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties		3	1
Skilled Nursing Facilities | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties		1
Assisted Living Facilities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties	114
Mortgage Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of fixed rate mortgage | property	9
Number of states | state	8
Number of independent healthcare operating companies operating under mortgage notes receivable | entity	7
Mortgage Receivable [Member] | Facilities Considered Long Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties | property	53