XML 50 R33.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Organization (Details) ft² in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 ft² state building Center community property
Real Estate Properties [Line Items] |
Number of properties owned | property | 443
Number of buildings | building | 469
Number of states in which properties are located | state | 42
Area of real estate properties (in square feet) | ft² | 812
Number of wellness centers | Center | 10
MOBs |
Real Estate Properties [Line Items] |
Number of properties owned | property | 129
Number of buildings | building | 155
Area of real estate properties (in square feet) | ft² | 12,600
SNFs |
Real Estate Properties [Line Items] |
Number of communities | community | 304

X
- Definition The number of buildings owned as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfBuildings
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of communities. + References No definition available. + Details
Name: | snh_NumberOfCommunities
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Wellness Centers + References No definition available. + Details
Name: | snh_NumberOfWellnessCenters
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=snh_MedicalOfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=snh_SkilledNursingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |