XML 47 R53.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Pro Forma Information (unaudited) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 10 Months Ended | 1 Months Ended | 5 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended
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Feb. 28, 2015 | Apr. 30, 2014 | Jan. 31, 2013 | Jul. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2014 property | Dec. 31, 2013 property | Jan. 31, 2015 property | Dec. 31, 2013 property | Sep. 30, 2014 property building | May 30, 2014 | May 31, 2014
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of properties |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,325 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment | $ 92,550 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment | $ 1,041 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  |  | 5,453 us-gaap_GainLossOnSaleOfProperties | 37,392 us-gaap_GainLossOnSaleOfProperties | (101)us-gaap_GainLossOnSaleOfProperties |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  | 15,630 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | 12,266 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | 121,793 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  | 6.28%us-gaap_DebtWeightedAverageInterestRate |  |  |  | 6.25%us-gaap_DebtWeightedAverageInterestRate |  |  |  | 6.28%us-gaap_DebtWeightedAverageInterestRate | 6.25%us-gaap_DebtWeightedAverageInterestRate |  |  | 6.25%us-gaap_DebtWeightedAverageInterestRate |  | 6.25%us-gaap_DebtWeightedAverageInterestRate |  |  |
Common shares issued in public offering | 31,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 15,525,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 11,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 13,800,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common shares issued in public offering | 660,014 us-gaap_ProceedsFromIssuanceOfCommonStock | 322,807 us-gaap_ProceedsFromIssuanceOfCommonStock | 261,813 us-gaap_ProceedsFromIssuanceOfCommonStock | 287,052 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |  | 322,807 us-gaap_ProceedsFromIssuanceOfCommonStock | 261,813 us-gaap_ProceedsFromIssuanceOfCommonStock | 287,052 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  | 1,750,000 us-gaap_DebtInstrumentFaceAmount |  |  |  | 1,100,000 us-gaap_DebtInstrumentFaceAmount |  |  |  | 1,750,000 us-gaap_DebtInstrumentFaceAmount | 1,100,000 us-gaap_DebtInstrumentFaceAmount |  |  | 1,100,000 us-gaap_DebtInstrumentFaceAmount |  | 1,100,000 us-gaap_DebtInstrumentFaceAmount |  |  |
Net proceeds after underwriting discounts from sale of senior unsecured notes |  | 644,889 us-gaap_ProceedsFromDebtNetOfIssuanceCosts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma results of operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 925,091 snh_SignificantAcquisitionsAndDisposalsProFormaRevenue | 827,801 snh_SignificantAcquisitionsAndDisposalsProFormaRevenue |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 173,622 snh_SignificantAcquisitionsAndDisposalsNetIncomeLoss | 137,369 snh_SignificantAcquisitionsAndDisposalsNetIncomeLoss |  |  |  |  |  |  |  |
Per common share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income per share(in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.85 snh_SignificantAcquisitionsAndDisposalsProFormaEarningsPerShareBasic | $ 0.68 snh_SignificantAcquisitionsAndDisposalsProFormaEarningsPerShareBasic |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 229,809 us-gaap_Revenues | 216,873 us-gaap_Revenues | 206,708 us-gaap_Revenues | 191,497 us-gaap_Revenues | 200,336 us-gaap_Revenues | 187,265 us-gaap_Revenues | 186,928 us-gaap_Revenues | 186,909 us-gaap_Revenues | 844,887 us-gaap_Revenues | 761,438 us-gaap_Revenues | 634,800 us-gaap_Revenues |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 135,114 us-gaap_InterestExpense | 117,819 us-gaap_InterestExpense | 117,240 us-gaap_InterestExpense |  |  |  |  |  |  |
MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price properties, excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  | 1,204,393 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember | 202,824 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember |  |  |  |  |  |  |  |
Skilled nursing facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SkilledNursingFacilityMember |  |  |  |  |  |
Assisted living facility member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_AssistedLivingFacilityMember |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per common share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 68,181 us-gaap_Revenues / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 12,306 us-gaap_Revenues / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 14,826 us-gaap_OperatingExpenses / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 4,057 us-gaap_OperatingExpenses / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 631 us-gaap_InterestExpense / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 368 us-gaap_InterestExpense / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  | 2 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 6 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Acquisition | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  | 2 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 6 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Number of properties acquired newly constructed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 snh_NumberOfPropertiesAcquiredNewlyConstructed / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |
Number of buildings acquired |  |  |  |  |  |  |  |  |  |  |  |  | 3 snh_NumberOfBuildingsAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 7 snh_NumberOfBuildingsAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  | 15,630 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |  |
Acquisition | MOBs | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  | 23 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  | 23 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Mortgage debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 snh_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  | 3 snh_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,452 us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  | 37,392 us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  |
Sale | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  |  |  |  |  |  |  | 6 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  |  |  |  |  |  |  |
Sale | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  |  |  |  |  |  |  | 3 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  |  |  |  |  | 3 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |
Number of Buildings Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 snh_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |
Sale | Skilled nursing facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 snh_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SkilledNursingFacilityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember |  |  |
Senior unsecured notes 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes3.25PercentMember |  |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes3.25PercentMember |  |  |  |  |  |  |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes3.25PercentMember |  |  |  |  |  |  |  |  |
Principal amount of debt |  | 400,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes3.25PercentMember |  |  | 400,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes3.25PercentMember |  |  |  |  |  |  |  | 400,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes3.25PercentMember |  |  |  |  |  |  |  |  |
Senior unsecured notes 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes4.75PercentMember |  |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes4.75PercentMember |  |  |  |  |  |  |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes4.75PercentMember |  |  |  |  |  |  |  |  |
Principal amount of debt |  | 250,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes4.75PercentMember |  |  | 250,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes4.75PercentMember |  |  |  |  |  |  |  | 250,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes4.75PercentMember |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 1.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  | 1.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  | 1.60%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  | 1.60%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  | $ 350,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  | $ 350,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember |  |  |  |  |  |  |  |  | $ 350,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember
Interest rate, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |
Interest rate added to the base rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember | 1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_UnsecuredDebtMember
Unsecured Debt | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR

X
- Definition This element represents the number of buildings acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
Name: | snh_NumberOfBuildingsAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of buildings sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfBuildingsSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties acquired or agreed to be acquired by the entity during the period that were newly constructed. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquiredNewlyConstructed
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfPropertiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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