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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2014
Basis of Presentation |
Ownership interest in subsidiaries (as a percent) | 100.00%snh_OwnershipPercentageHeldInSubsidiary
Buildings and improvements | Real Estate Investment [Member] |
Real Estate Properties |
Estimated useful lives | 40 years
Furniture and Fixtures [Member] | Real Estate Investment [Member] | Minimum |
Real Estate Properties |
Estimated useful lives | 7 years
Furniture and Fixtures [Member] | Real Estate Investment [Member] | Maximum |
Real Estate Properties |
Estimated useful lives | 12 years

X
- Definition Represents the percentage of ownership held in the subsidiary either directly or indirectly. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |