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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2015 property item building | Dec. 31, 2014
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Assets and liabilities measured at fair value |  |
Number of properties classified as held for sale | 4 snh_NumberOfRealEstatePropertiesHeldForSale |
Number of buildings classified as held for sale | 7 snh_NumberOfBuildingsHeldForSale |
Cumulative impairments of properties held for sale | $ 11,365 snh_CumulativeImpairmentOfLongLivedAssetsToBeDisposed |
Number of public issues of unsecured senior notes | 6 snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes |
Senior notes | 1,743,983 us-gaap_SeniorNotes | 1,743,628 us-gaap_SeniorNotes
Excess of fair value over aggregate book value | 107,931 snh_SeniorNotesFairValueInExcessOfBookValue |
Secured Debt | 609,032 us-gaap_SecuredDebt |
Excess of fair value over aggregate book value | 66,837 snh_SecuredDebtFairValueInExcessOfBookValue |
CommonWealth REIT (EQC) |  |
Assets and liabilities measured at fair value |  |
Investment in common shares | 250,000 us-gaap_InvestmentOwnedBalanceShares / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = snh_CommonWealthREITMember |
Five Star |  |
Assets and liabilities measured at fair value |  |
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 | 3,145 us-gaap_RealEstateHeldforsale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |
Investments in available for sale securities | 25,441 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 | 25,441 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |
Recurring and Nonrecurring | Significant Unobservable Inputs (Level 3) |  |
Assets and liabilities measured at fair value |  |
Assets held for sale | $ 3,145 us-gaap_RealEstateHeldforsale / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = snh_FairValueMeasurementsRecurringAndNonrecurringMember |

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- Definition The cumulative amount of write-downs for impairments recognized during the period for long-lived assets held for sale. + References No definition available. + Details
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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 Represents the number of public issues of unsecured senior notes. + References No definition available. + Details
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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 The amount by which the fair value of secured debt exceeds the book value. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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