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Senior Living Community Management Agreements - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) community property	Sep. 30, 2022 USD ($) community	Dec. 31, 2021 unit community
Number of Properties | property	376		376
Property operating expenses	$ 298,432	$ 289,096	$ 870,740	$ 823,904
Disposal Group, Held-for-Sale, Not Discontinued Operations
Number of Properties | property	6		6
Five Star
Property management agreement expense	$ 10,058	9,477	$ 29,962	27,380
Related party transaction capitalized amount	601	876	2,053	2,363
Five Star | Rehabilitation Services
Property operating expenses	0	1,590	1,213	5,242
Five Star | Operating Expense
Property management agreement expense	9,457	8,601	$ 27,909	25,017
Senior Living Communities | Five Star | Disposal Group, Held-for-Sale, Not Discontinued Operations
Number of Properties | community					108
Senior Living Communities | Five Star | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations
Number of properties transitioned | community					107
Number of property units (units) | unit					7,340
Amounts of transaction		220		$ 1,665
Senior Living Communities | Affiliated Entity | Five Star
Number of communities managed | community			119	120
Senior Living Communities | Affiliated Entity | Third Party Managers
Number of communities managed | community			111	107
Property management agreement expense	$ 5,635	$ 5,108	$ 16,230	$ 15,434

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- Definition

Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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- Definition

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

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The number of units in a real estate property owned as of the balance sheet date.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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Amount of transactions with related party during the financial reporting period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-3

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