Gross investment in facilities net of impairments and reserve for uncollectible loans.

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The number of third party tenants, mortgages and their affiliates who manage and/or operate the entity's properties.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The number of real estate properties owned as of the balance sheet date.

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The number of states the entity operates in as of the balance sheet date.

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Amount of investments classified as other.

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CONCENTRATION OF RISK (Narrative) (Detail) $ in Thousands	12 Months Ended
CONCENTRATION OF RISK (Narrative) (Detail) $ in Thousands	Dec. 31, 2019 USD ($) facility state item contract	Dec. 31, 2018 USD ($) facility contract	Dec. 31, 2017	Jun. 30, 2018 facility
Concentration Risk [Line Items]
Number of real estate properties	987
Number of operators that met or exceeded ten percent threshold for revenues \| contract	1	1
Number of states \| state	40
Number of operators \| item	71
Gross investment in facilities, net of impairments and reserves for uncollectible loans \| $	$ 9,800,000
Other investments \| $	419,228	$ 504,626
Investment in unconsolidated joint venture \| $	$ 199,884	$ 31,045
Geographic Concentration Risk [Member] \| Florida
Concentration Risk [Line Items]
Concentration percentage	15.00%
Geographic Concentration Risk [Member] \| Texas
Concentration Risk [Line Items]
Concentration percentage	10.00%
Geographic Concentration Risk [Member] \| Michigan
Concentration Risk [Line Items]
Concentration percentage	7.00%
Product Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	98.00%
Skilled Nursing Facilities
Concentration Risk [Line Items]
Number of real estate properties	784	12
Skilled Nursing Facilities \| Texas
Concentration Risk [Line Items]
Number of real estate properties				5
Assisted Living Facilities
Concentration Risk [Line Items]
Number of real estate properties	114
Specialty
Concentration Risk [Line Items]
Number of real estate properties	28
Medical Office Building
Concentration Risk [Line Items]
Number of real estate properties	2
Ciena Healthcare \| Revenue Benchmark [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage	10.00%	11.00%	10.00%
Facilities Under Fixed Rate Mortgage Loans [Member] \| Skilled Nursing Facilities
Concentration Risk [Line Items]
Number of real estate properties	47
Facilities Under Fixed Rate Mortgage Loans [Member] \| Assisted Living Facilities
Concentration Risk [Line Items]
Number of real estate properties	2
Facilities Under Fixed Rate Mortgage Loans [Member] \| Specialty
Concentration Risk [Line Items]
Number of real estate properties	4
Facilities Held for Sale or Closed [Member]
Concentration Risk [Line Items]
Number of real estate properties	6