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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 09, 2021 USD ($) unit community	Jan. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) community unit property trustee shares	Sep. 30, 2020 USD ($) community	Sep. 30, 2021 USD ($) community unit property trustee shares	Sep. 30, 2020 USD ($) community	Nov. 02, 2021 unit community	Dec. 31, 2020 shares	Dec. 31, 2019 shares
Common shares of beneficial interest, shares issued (in shares) | shares			238,995,435		238,995,435			238,268,478
Gain on lease termination			$ 0	$ 0	$ 0	$ 22,896
Number of properties (property) | property			392		392
Rental income			$ 399	$ 393	$ 1,194	1,175
Five Star
Total rental income recognized						75,000
Gain on lease termination						$ 22,896
Five Star | Minimum
Percentage target EBITDA of new management agreement not earned					70.00%
Management fees as a percentage of gross revenues			5.00%		5.00%
Percentage of annual incentive fee			15.00%		15.00%
Five Star | Maximum
Percentage target EBITDA of new management agreement not earned					80.00%
Management fees as a percentage of gross revenues			6.00%		6.00%
Percentage of annual incentive fee			25.00%		25.00%
Five Star
Payments made in exchange for customary release		$ 5,763
Five Star | Senior Living Communities
Number of properties (property) | community			159	239	159	239
Number of real estate properties inadequate documentation | trustee			1		1
Revenue reserve, management fees payable reduction					$ 115
Five Star
Common shares of beneficial interest, shares issued (in shares) | shares									10,268,158
Aggregate Shares Issued | shares									16,118,849
Third Party Investor | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Scenario, Plan | Subsequent Event
Number of properties transitioned | community							8
Third Party Investor | Five Star | Minimum
Construction supervision fee (percent)			3.00%		3.00%
Third Party Investor | Five Star | Maximum
Construction supervision fee (percent)			5.00%		5.00%
Five Star
Investment owned, percentage of total shares outstanding			33.70%		33.70%
Property management agreement expense			$ 11,220	$ 15,182	$ 37,997	$ 47,937
Related party transaction capitalized amount			702	573	2,251	1,479
Five Star | Operating Expense
Property management agreement expense			$ 10,518	14,609	$ 35,746	46,458
Five Star | Senior Living Communities
Number of properties (property) | community	120		108		108
Number of property units (units) | unit	18,000
Related party transactions, termination percentage	10.00%
Percentage target EBITDA of new management agreement not earned	80.00%
Number of properties transitioned | community			107		107
Five Star | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations
Total rental income recognized	$ 682,000		$ 3,123		$ 15,037
Number of property units (units) | unit	7,500		4,755		4,755
Number of properties transitioned | community			69		69
Five Star | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Scenario, Plan
Number of properties (property) | community	108
Five Star | Senior Living Communities | Closed
Number of property units (units) | unit	1,500
Five Star | Rehabilitation Services
Expenses from transactions with related party			$ 1,508	$ 5,972	$ 9,579	$ 19,843
Five Star | Third Party Investor | Senior Living Communities | Subsequent Event
Number of properties (property) | community							9
Five Star | Third Party Investor | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Subsequent Event
Number of property units (units) | unit							1,845
Number of properties transitioned | community							30
Five Star | Third Party Investor | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Scenario, Plan | Subsequent Event
Number of property units (units) | unit							819

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