CONCENTRATION OF CREDIT RISK - Narrative (Details)	9 Months Ended
Sep. 30, 2023 state property province
Concentration Risk
Number of real estate properties	1,400
Kindred
Concentration Risk
Number of real estate properties	29
Consolidated Seniors Housing Communities
Concentration Risk
Number of real estate properties	583
Triple-Net Leased Properties \| LTAC \| Kindred
Concentration Risk
Number of real estate properties	29
Triple-Net Leased Properties \| LTAC \| Kindred \| Group 2
Concentration Risk
Number of real estate properties	23
Triple-Net Leased Properties \| LTAC \| Kindred \| Group 1
Concentration Risk
Number of real estate properties	6
Atria \| Senior Housing Communities
Concentration Risk
Number of Independent Third Party Managed Properties	221
Sunrise \| Senior Housing Communities
Concentration Risk
Number of Independent Third Party Managed Properties	92
Atria and Sunrise \| Consolidated Seniors Housing Communities
Concentration Risk
Number of real estate properties	313
Holiday Retirement \| Senior Living Communities, Operations Transitioned
Concentration Risk
Number of Independent Third Party Managed Properties	70
Customer Concentration Risk \| Total Gross Book Value of Properties \| Outpatient Medical Buildings and Other
Concentration Risk
Concentration percentage	34.40%
Customer Concentration Risk \| Total Gross Book Value of Properties \| Triple-Net Leased Properties \| Senior Housing Communities
Concentration Risk
Concentration percentage	10.60%
Customer Concentration Risk \| Total Gross Book Value of Properties \| SHOP \| Senior Housing Communities
Concentration Risk
Concentration percentage	55.00%
Customer Concentration Risk \| Total Gross Book Value of Properties \| Atria
Concentration Risk
Concentration percentage	23.60%
Customer Concentration Risk \| Total Gross Book Value of Properties \| Sunrise
Concentration Risk
Concentration percentage	9.30%
Customer Concentration Risk \| Total Gross Book Value of Properties \| Brookdale Senior Living
Concentration Risk
Concentration percentage	7.60%
Customer Concentration Risk \| Total Gross Book Value of Properties \| Ardent
Concentration Risk
Concentration percentage	5.10%
Customer Concentration Risk \| Total Gross Book Value of Properties \| Kindred
Concentration Risk
Concentration percentage	0.80%
Geographic Concentration Risk
Concentration Risk
Number of states in which entity operates \| state	47
Number of states accounting for more than 10% of total revenues and net operating income \| state	1
Continuing revenues and NOI threshold	10.00%
Geographic Concentration Risk \| CANADA
Concentration Risk
Number of Canadian provinces in which entity operates \| province	7

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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-Topic 954
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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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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Continuing Revenues And NOI Threshold

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

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Number Of States Accounting For More than Ten Percent Of Revenues And Net Operating Income

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The number of properties that are managed by the third party.

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