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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 building property item | Dec. 31, 2013
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Assets and liabilities measured at fair value |  |
Investments in available for sale securities | $ 23,993 us-gaap_AvailableForSaleSecurities | $ 29,078 us-gaap_AvailableForSaleSecurities
Number of properties classified as held for sale | 5 snh_NumberOfRealEstatePropertiesHeldForSale |
Number of Buildings Held For Sale | 8 snh_NumberOfBuildingsHeldForSale |
Cumulative impairments of properties held for sale | 17,753 snh_CumulativeImpairmentOfLongLivedAssetsToBeDisposed |
Number of public issues of unsecured senior notes | 6 snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes |
Senior notes | 1,743,628 us-gaap_SeniorNotes | 1,093,337 us-gaap_SeniorNotes
Excess of fair value over aggregate book value | 97,332 snh_SeniorNotesFairValueInExcessOfBookValue |
Secured Debt | 611,369 us-gaap_SecuredDebt |
Excess of fair value over aggregate book value | 67,138 snh_SecuredDebtFairValueInExcessOfBookValue |
CommonWealth REIT (EQC) |  |
Assets and liabilities measured at fair value |  |
Investments in available for sale securities | 6,418 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_CommonWealthREITMember | 5,828 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_CommonWealthREITMember
Investment in common shares | 250,000 us-gaap_InvestmentOwnedBalanceShares / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_CommonWealthREITMember |
Five Star |  |
Assets and liabilities measured at fair value |  |
Investments in available for sale securities | 17,575 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_FiveStarQualityCareIncMember | 23,250 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_FiveStarQualityCareIncMember
Investment in common shares | 4,235,000 us-gaap_InvestmentOwnedBalanceShares / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_FiveStarQualityCareIncMember |
Recurring and Nonrecurring | Total |  |
Assets and liabilities measured at fair value |  |
Assets held for sale | 3,395 us-gaap_RealEstateHeldforsale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |
Investments in available for sale securities | 23,993 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |
Recurring and Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets and liabilities measured at fair value |  |
Investments in available for sale securities | 23,993 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |
Recurring and Nonrecurring | Significant Other Observable Inputs (Level 2) |  |
Assets and liabilities measured at fair value |  |
Assets held for sale | $ 3,395 us-gaap_RealEstateHeldforsale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |

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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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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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