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Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 building property | Dec. 31, 2013 | Dec. 31, 2012
Real estate properties |  |  |
Number of properties that met the criteria for discontinued operations | 5 snh_NumberOfRealEstatePropertiesHeldForSale |  |
Number of buildings that met the criteria for discontinued operations | 8 snh_NumberOfBuildingsHeldForSale |  |
Income from discontinued operations | $ 1,362 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | $ 5,043 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | $ 4,061 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
MOBs |  |  |
Real estate properties |  |  |
Number of properties that met the criteria for discontinued operations | 4 snh_NumberOfRealEstatePropertiesHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember |
Number of buildings that met the criteria for discontinued operations | 7 snh_NumberOfBuildingsHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | 7 snh_NumberOfBuildingsHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember |
Discontinued operations, properties sold or held for sale |  |  |
Real estate properties |  |  |
Rental income | 3,949 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | 9,451 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | 10,042 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember
Property operating expenses | (2,587)snh_DisposalGroupIncludingDiscontinuedOperationDirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | (3,609)snh_DisposalGroupIncludingDiscontinuedOperationDirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | (3,567)snh_DisposalGroupIncludingDiscontinuedOperationDirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember
Depreciation and amortization |  | (799)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | (2,414)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember
Income from discontinued operations | $ 1,362 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | $ 5,043 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember | $ 4,061 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_SegmentDiscontinuedOperationsMember

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- 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

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- 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
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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
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Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
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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
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- Definition Amount of depreciation and amortization attributable to disposal group. + 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
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- 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
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- Details
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- Details
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