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Business and Property Management Agreements with RMR (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) employee	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) employee jointVenture_arrangement agreement	Jun. 30, 2023 USD ($)
Related person transactions
Number of employees | employee	0		0
Property management and construction supervision fees	$ 1,720,000	$ 2,202,000	$ 3,624,000	$ 4,194,000
Property management and construction supervision fees paid	3,713,000	3,561,000	7,441,000	7,094,000
RMR
Related person transactions
Business management fees incurred	3,128,000	3,321,000	8,006,000	6,591,000
Reversal of estimated incentive fees	(849,000)		$ 0
Period of actual amount of incentive fees			3 years
Property management and construction supervision fees	1,446,000	1,400,000	$ 2,984,000	2,863,000
Party transaction property management and construction supervision fees capitalized	$ 274,000	$ 802,000	$ 640,000	$ 1,331,000
Number joint venture arrangements | jointVenture_arrangement			2
Senior Living Communities | RMR
Related person transactions
Number of consecutive renewal terms of agreement | agreement			2

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
-Paragraph 1
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-Publisher FASB
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