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Real Estate Properties - Schedule of Real Estate Properties (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) building | May 31, 2019 USD ($) building | Mar. 31, 2019 USD ($) building | Feb. 28, 2019 USD ($) building | Jun. 30, 2019 USD ($) building
Real Estate [Line Items] |  |  |  |  |
Number of Properties | building | 13 |  |  |  | 13
Gross Sales Price |  |  |  |  | $ 35,107
Gain (loss) on Sale |  |  |  |  | 17,710
MOBs |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 13,607
MOBs | Florida |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of Properties | building |  |  |  | 1 |
Gross Sales Price |  |  |  | $ 2,900 |
Gain (loss) on Sale |  |  |  | $ (64) |
MOBs | Massachusetts |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of Properties | building | 7 |  | 1 |  | 7
Gross Sales Price | $ 8,042 |  | $ 75 |  |
Gain (loss) on Sale | $ 1,590 |  | $ (58) |  |
MOBs | Colorado |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of Properties | building |  | 1 |  |  |
Gross Sales Price |  | $ 2,590 |  |  |
Gain (loss) on Sale |  | 1,035 |  |  |
SNF |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Gross Sales Price |  | $ 21,500 |  |  |
SNF | California |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of Properties | building |  | 3 |  |  |
Gross Sales Price |  | $ 21,500 |  |  |
Gain (loss) on Sale |  | $ 15,207 |  |  |

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- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity. + References No definition available. + Details
Name: | snh_RealEstateAggregateSalesPrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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
Name: | us-gaap_RealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=snh_MedicalOfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | srt_StatementGeographicalAxis=stpr_FL
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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