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Real Estate Properties - Leases (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) community	Jan. 31, 2018 tenant
Real Estate [Line Items]
Straight line rent	$ 2,993	$ 3,429
Senior Living Communities
Real Estate [Line Items]
Number of communities leased by the Company | community			8
Pacifica Senior Living, LLC. | Senior Living Communities
Real Estate [Line Items]
Lease deposit			$ 3,277
Number of tenants | tenant				1
Proceeds from rents received			2,049
Straight line rent			105
Security deposit liability			$ 583
Period of guaranteed rent			1 year
Rental income, security deposit applied	$ 528

X

- Definition

Lessee, Operating Lease, Period Of Guaranteed Rent

+ References

No definition available.

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Namespace Prefix:	snh_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Tenants Associated With Leases In Default

+ References

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+ Details

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X

- Definition

Number of Communities Leased by the Company

+ References

No definition available.

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Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Rental Income, Security Deposit Applied

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of liability for lease payments received, including variable lease payments, when collectability is not probable at commencement date for sales-type lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 25
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82918700&loc=SL77919106-209958

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Balance Type:	credit
Period Type:	instant

X

- Definition

Cash received for rents during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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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.

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No definition available.

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- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Balance Type:	credit
Period Type:	duration

X

- Details

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Period Type:

X

- Details

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