XML 46 R34.htm IDEA: XBRL DOCUMENT
v3.19.1

Real Estate Properties - Schedule of Real Estate Properties (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) building | Feb. 28, 2019 USD ($) building | Mar. 31, 2019 USD ($) building
Real Estate [Line Items] |  |  |
Number of Properties | building | 2 |  | 2
Gross Sales Price |  |  | $ 2,975
MOBs |  |  |
Real Estate [Line Items] |  |  |
Gross Sales Price |  |  | $ 2,975
MOBs | Florida |  |  |
Real Estate [Line Items] |  |  |
Number of Properties | building |  | 1 |
Gross Sales Price |  | $ 2,900 |
MOBs | Massachusetts |  |  |
Real Estate [Line Items] |  |  |
Number of Properties | building | 1 |  | 1
Gross Sales Price | $ 75 |  |

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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 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
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_MA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |