XML 51 R32.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Organization (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 ft² state building community property
Real Estate Properties [Line Items] |
Number of properties owned | 440
Number of buildings | building | 466
Number of states in which properties are located | state | 42
Number of communities | community | 305
MOBs |
Real Estate Properties [Line Items] |
Number of properties owned | 125
Number of buildings | building | 151
Wellness centers | MOBs |
Real Estate Properties [Line Items] |
Number of properties owned | 10
Area of real estate properties (in square feet) | ft² | 812,000

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 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_PropertyPlantAndEquipmentByTypeAxis=snh_WellnessCentersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |