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Business and Property Management Agreements with RMR LLC - (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) employee management_agreement property	Mar. 31, 2016 USD ($)
Related person transactions
Number of employees | employee	0
Property management and construction supervision fees	$ 2,590	$ 2,546
Property management and construction supervision fees paid	2,379	2,128
Professional Fees	67
RMR LLC
Related person transactions
Business management fees incurred		$ 8,347
Related Party Transaction Amortization Of Liability	62
Related Party Transaction Business Management Fees Related to Subsidiary Level Management	12,781
Related Party Transaction Business Management Agreement Incentive Fee Paid	$ 3,266
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

X

- Definition

Represents the number of communities managed by a related party.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

Represents the amount of amortization of the liability recorded during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Related Party Transaction Business Management Agreement Incentive Fee Paid

+ References

No definition available.

+ Details

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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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Namespace Prefix:	snh_
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- Definition

Related Party Transaction Business Management Fees Related to Subsidiary Level Management

+ References

No definition available.

+ Details

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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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Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
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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.

+ Details

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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- Details

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- Details

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- Details

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