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Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 building property | Mar. 31, 2014
Real estate properties |  |
Number of properties that met the criteria for discontinued operations | 4 snh_NumberOfRealEstatePropertiesHeldForSale |
Number of buildings that met the criteria for discontinued operations | 7 snh_NumberOfBuildingsHeldForSale |
(Loss) income from discontinued operations | $ (241)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | $ 1,300 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
MOBs |  |
Real estate properties |  |
Number of properties that met the criteria for discontinued operations | 1 snh_NumberOfRealEstatePropertiesHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | 4 snh_NumberOfRealEstatePropertiesHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember
Number of buildings that met the criteria for discontinued operations | 4 snh_NumberOfBuildingsHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | 7 snh_NumberOfBuildingsHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember
Rental income | 32 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | 2,294 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember
Property operating expenses | (273)snh_DisposalGroupIncludingDiscontinuedOperationDirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | (994)snh_DisposalGroupIncludingDiscontinuedOperationDirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember
(Loss) income from discontinued operations | $ (241)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | $ 1,300 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember

X
- Definition Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment that part of disposal group. + References No definition available. + Details
Name: | snh_DisposalGroupIncludingDiscontinuedOperationDirectCostsOfLeasedAndRentedPropertyOrEquipment
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of buildings owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfBuildingsHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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