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Business and Property Management Agreements with RMR LLC (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) employee	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) property employee management_agreement	Sep. 30, 2017 USD ($)
Related person transactions
Number of employees | employee		0		0
Related party transaction business management agreement incentive fee paid	$ 55,740
Property management and construction supervision fees		$ 3,025	$ 2,736	$ 8,829	$ 8,034
Property management and construction supervision fees paid		3,440	2,353	9,391	7,116
Professional fees		35	72	173	206
RMR LLC
Related person transactions
Business management fees incurred		28,306	17,744	78,119	50,956
Related party transaction business management fees related to subsidiary level management		725	725	2,175	1,512
Related party transaction business management agreement, annual incentive fee estimate included in management fees		$ 18,751	$ 8,022	$ 50,708	$ 22,048
Related party transaction, incentive fee payable assessment period				3 years
Senior Living Communities | RMR Inc
Related person transactions
Number of consecutive renewal terms of agreement | management_agreement				2
Number of communities managed by related party | property				1

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Represents the number of communities managed by a related party.

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Represents the number of persons employed by a related party of the entity.

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Related Party Transaction, Business Management Agreement Annual Incentive Fee Estimate Included in Management Fees

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- Definition

Represents the business management fees incurred pursuant to business management agreement with related parties.

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Related Party Transaction Business Management Fees Related to Subsidiary Level Management

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- Definition

Represents the number of consecutive renewal terms of agreement that the entity has the option to renew.

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- Definition

Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties.

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Represents the property management and construction supervision fees paid to related parties.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section 45
-Paragraph 3
-Subparagraph (k)
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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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