XML 28 R32.htm IDEA: XBRL DOCUMENT
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Related Person Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
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Feb. 28, 2015 property | Apr. 30, 2014 | Mar. 31, 2015 property item | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 community item | Apr. 30, 2015 | May 01, 2015 | Jan. 31, 2015 property sqft | May 31, 2015 community | Dec. 31, 2014 community item
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Issuance of shares (in shares) | 31,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 15,525,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  | 31,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |
Number of states in which properties are located |  |  | 39 us-gaap_NumberOfStatesInWhichEntityOperates |  |  |  |  |  |  |  |
Income (loss) recognized arising from equity investments |  |  | $ 72 us-gaap_IncomeLossFromEquityMethodInvestments |  | $ (97)us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |  |  |
Number of properties agreed to be offered for sale |  |  | 4 snh_NumberOfRealEstatePropertiesHeldForSale |  |  |  |  |  |  |  |
Number of properties sold or agreed to be sold | 1 snh_NumberOfPropertiesSold |  |  |  |  |  |  |  |  |  |
Interest and other income |  |  | 75 us-gaap_InterestAndOtherIncome |  | 105 us-gaap_InterestAndOtherIncome |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties Collateralized |  |  | 46 snh_NumberOfRealEstatePropertiesCollateralized / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember |  |  |  |  |  |  |  |
Senior living communities |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  | 192 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember |  |  | 395 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember |  |  |  |  | 395 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember
Number Of Communities |  |  |  |  |  | 5 snh_NumberOfCommunities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember |  |  |  |  |
Number of properties agreed to be offered for sale |  |  | 3 snh_NumberOfRealEstatePropertiesHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember |  |  |  |  |  |  |  |
Senior living communities | Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold | 250 snh_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_StatementGeographicalAxis = country_PA |  |  |  |  |  |  |  |  |  |
MOBs |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold |  |  |  |  |  |  | 1,500 snh_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember |  |  |  |
Number of properties agreed to be offered for sale |  |  | 1 snh_NumberOfRealEstatePropertiesHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember |  | 4 snh_NumberOfRealEstatePropertiesHeldForSale / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Total rental income recognized |  |  | 7,046 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  | 23 snh_NumberOfPropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  | 2 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |
Acquisition | Senior living communities | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  |  |  | 3,379 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Purchase price |  |  |  |  |  |  |  | 762,611 snh_RealEstateAggregatePurchasePrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Acquisition | MOBs |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  | 539,000 snh_RealEstateAggregatePurchasePriceIncludingOtherSettlementAdjustments / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  | 539,000 snh_RealEstateAggregatePurchasePriceIncludingOtherSettlementAdjustments / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Number of properties acquired or agreed to be acquired |  |  | 23 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  | 2 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  | 23 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Purchase price |  |  |  |  |  |  |  |  | 539,000 snh_RealEstateAggregatePurchasePrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Area of real estate properties (in square feet) |  |  | 2,170,000 us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  | 2,170,000 us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Agreement to acquire | Senior living communities |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  | 3,466 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember |  |  |  |  | 3,466 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember
Number Of Communities |  |  |  |  |  |  |  |  |  | 37 snh_NumberOfCommunities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember | 38 snh_NumberOfCommunities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember
Number of properties acquired or agreed to be acquired |  |  |  |  |  | 38 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember |  |  |  |  |
Purchase price |  |  |  |  |  | 790,000 snh_RealEstateAggregatePurchasePrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember |  |  |  |  |
Agreement to acquire | Senior living communities | GA |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  |  | 40 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember / us-gaap_StatementGeographicalAxis = stpr_GA |  |  |  |
Number Of Communities |  |  |  |  |  |  | 1 snh_NumberOfCommunities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember / us-gaap_StatementGeographicalAxis = stpr_GA |  |  |  |
Purchase price |  |  |  |  |  |  | 9,750 snh_RealEstateAggregatePurchasePrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_AgreementToAcquireMember / us-gaap_StatementGeographicalAxis = stpr_GA |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  | 191,007 snh_OperatingLeasesAnnualRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |  |  |
Total rental income recognized |  |  | 47,691 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 47,506 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |
Rents receivable |  |  | 15,893 snh_RentsReceivable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  | 17,310 snh_RentsReceivable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  | 17,310 snh_RentsReceivable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember
Deferred estimated percentage rent |  |  | 1,456 snh_DeferredEstimatedPercentageRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 1,416 snh_DeferredEstimatedPercentageRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |
Real estate improvements purchased |  |  | 4,550 snh_RealEstateImprovementsByLesseePurchased / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 8,614 snh_RealEstateImprovementsByLesseePurchased / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  | 367 snh_IncreaseDecreaseOperatingLeasesAnnualRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 689 snh_IncreaseDecreaseOperatingLeasesAnnualRent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |
Sublease rental |  |  | 752 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 730 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |
Five Star | Senior living communities |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  | 180 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  | 881 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  | 881 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember
Number of properties acquired, referred to as managed properties |  |  | 46 snh_NumberOfPropertiesAcquiredManagedProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |  |  |
Property management agreement expense |  |  | 2,523 snh_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 2,425 snh_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |  |
Number Of Communities |  |  |  |  |  | 14 snh_NumberOfCommunities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  |  |  |
Five Star | Senior living communities | GA |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  |  | 40 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_StatementGeographicalAxis = stpr_GA |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  | 9,750 snh_RealEstateAggregatePurchasePriceIncludingOtherSettlementAdjustments / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_StatementGeographicalAxis = stpr_GA |  |  |  |
Five Star | Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  |  |  |  |  | 881 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Number Of Communities |  |  |  |  |  |  |  |  |  | 14 snh_NumberOfCommunities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Five Star | Sale | Senior living communities | Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable | 23 snh_IncreaseDecreaseOperatingLeasesAnnualRent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember / us-gaap_StatementGeographicalAxis = country_PA |  |  |  |  |  |  |  |  |  |
Number of living units | 120 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember / us-gaap_StatementGeographicalAxis = country_PA |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold | 250 snh_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = snh_SaleOfAssetsMember / us-gaap_StatementGeographicalAxis = country_PA |  |  |  |  |  |  |  |  |  |
RMR |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Property management agreement expense |  |  | 2,438 snh_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  | 1,638 snh_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  |  |  |  |  |
Business management agreement expense |  |  | 8,869 snh_RelatedPartyTransactionExpensesFromBusinessManagementAgreementTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  | 6,682 snh_RelatedPartyTransactionExpensesFromBusinessManagementAgreementTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  |  |  |  |  |
Issuance of shares (in shares) |  |  | 39,467 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_ReitManagementAndResearchLLCMember |  |  |  |  |  |  |  |
SIR |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Debt disposed of from properties sold |  |  |  |  |  |  |  |  | 29,955 snh_RealEstateDebtDisposedOfInSaleOfPropertyTransactions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_SelectIncomeReitMember |  |
Amount from SIR related to working capital activity |  |  | 8,993 snh_AmountOwedFromSir / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_SelectIncomeReitMember |  |  |  |  |  |  |  |
SIR | Acquisition | MOBs |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  | 23 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_SelectIncomeReitMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Purchase price |  |  |  |  |  |  |  |  | 539,000 snh_RealEstateAggregatePurchasePrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_SelectIncomeReitMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Area of real estate properties (in square feet) |  |  |  |  |  |  |  |  | 2,170,000 us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_SelectIncomeReitMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |
Number of states in which properties are located |  |  | 12 us-gaap_NumberOfStatesInWhichEntityOperates / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_MedicalOfficeBuildingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_SelectIncomeReitMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |  |  |  |  |  |  |  |
AIC |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |
Equity method investments, carrying value |  |  | 6,944 us-gaap_EquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_AffiliatesInsuranceCompanyMember |  |  |  |  |  |  |  |
Income (loss) recognized arising from equity investments |  |  | $ 72 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_AffiliatesInsuranceCompanyMember |  | $ (97)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_AffiliatesInsuranceCompanyMember |  |  |  |  |  |

X
- Definition Represent the amounts due from related person, owed to us from SIR related to working capital activity for MOBs. + References No definition available. + Details
Name: | snh_AmountOwedFromSir
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the deferred percentage rent estimated during the period. + References No definition available. + Details
Name: | snh_DeferredEstimatedPercentageRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_IncreaseDecreaseOperatingLeasesAnnualRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 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 Represents the number of properties acquired or agreed to be acquired by the entity during the period, which are referred by the entity as managed properties. + References No definition available. + Details
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Balance Type: | na
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- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The number of real estate properties serving as collateral for debt as of the balance sheet date. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- 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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- Definition Represents the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
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- Definition This element represents the aggregate purchase price excluding closing costs, of real estate properties acquired by the entity during the period. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate purchase price of real estate properties acquired by the entity during the period. This amount includes cash paid plus debt assumed, if any, and other settlement adjustments but excludes closing costs. + References No definition available. + Details
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- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | snh_
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Balance Type: | credit
Period Type: | duration

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- Definition Represents the debt disposed of in sale of property transactions. + References No definition available. + Details
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- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + References No definition available. + Details
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- Definition Expenses recognized during the period resulting from business management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
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- Definition Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
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- Definition Represents rents receivable at the balance sheet date. + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 + Details
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- Definition The number of units (items of property) under operating lease arrangements. + References No definition available. + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Details
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- Details
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- Details
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