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Business and Property Management Agreements with RMR LLC (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) management_agreement employee property	Mar. 31, 2017 USD ($)
Related person transactions
Number of employees | employee		0
Related party transaction business management agreement incentive fee paid	$ 55,740
Property management and construction supervision fees		$ 2,821	$ 2,590
Property management and construction supervision fees paid		2,779	2,379
Professional fees		69	67
RMR LLC
Related person transactions
Business management fees incurred		23,323	12,781
Related party transaction business management fees related to subsidiary level management		725	62
Related party transaction business management agreement, annual incentive fee estimate included in management fees		$ 14,347	$ 3,266
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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- Definition

Represents the number of communities managed by a related party.

+ References

No definition available.

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- Definition

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

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- Definition

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

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- Definition

Related Party Transaction Business Management Agreement Incentive Fee Paid

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Related Party Transaction Business Management Fees Related to Subsidiary Level Management

+ References

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- Definition

Related Party Transaction, Incentive Fee Payable Assessment Period

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section 45
-Paragraph 3
-Subparagraph (k)
-URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849

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- Definition

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.

+ References

No definition available.

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