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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Aug. 31, 2009 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2012 | Dec. 31, 2014 | Jul. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | May 31, 2014
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized | $ 8,039 snh_DeferredDebtIssuanceCosts |  | $ 3,326 snh_DeferredDebtIssuanceCosts | $ 12,608 snh_DeferredDebtIssuanceCosts |  | $ 8,039 snh_DeferredDebtIssuanceCosts |  |  |  |
Principal amount of debt | 1,750,000 us-gaap_DebtInstrumentFaceAmount |  | 1,100,000 us-gaap_DebtInstrumentFaceAmount |  |  | 1,750,000 us-gaap_DebtInstrumentFaceAmount |  |  |  |
Unamortized gross balance of deferred financing fees | 50,479 us-gaap_DeferredFinanceCostsGross |  | 19,930 us-gaap_DeferredFinanceCostsGross |  |  | 50,479 us-gaap_DeferredFinanceCostsGross |  |  |  |
Accumulated amortization related to deferred financing fees | 42,797 us-gaap_AccumulatedAmortizationDeferredFinanceCosts |  | 14,822 us-gaap_AccumulatedAmortizationDeferredFinanceCosts |  |  | 42,797 us-gaap_AccumulatedAmortizationDeferredFinanceCosts |  |  |  |
Weighted average amortization period of deferred financing fees | 12 years 8 months 12 days |  |  |  |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  |  |
Amortization expense in 2015 | 5,469 snh_DeferredFinanceCostsFutureAmortizationExpenseYearOne |  |  |  |  |  |  |  |  |
Amortization expense in 2016 | 4,803 snh_DeferredFinanceCostsFutureAmortizationExpenseYearTwo |  |  |  |  |  |  |  |  |
Amortization expense in 2017 | 4,523 snh_DeferredFinanceCostsFutureAmortizationExpenseYearThree |  |  |  |  |  |  |  |  |
Amortization expense in 2018 | 3,127 snh_DeferredFinanceCostsFutureAmortizationExpenseYearFour |  |  |  |  |  |  |  |  |
Amortization expense in 2019 | 2,389 snh_DeferredFinanceCostsFutureAmortizationExpenseYearFive |  |  |  |  |  |  |  |  |
Amortization expense thereafter | 10,238 snh_DeferredFinanceCostsFutureAmortizationExpenseAfterYearFive |  |  |  |  |  |  |  |  |
Senior unsecured notes 6.75% |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  |  |  |  |  | 11,439 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember | 44 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember |  |
Principal amount of debt | 200,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember |  | 200,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember |  |  | 200,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember | 350,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember | 300,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotes6.75PercentMember |  |
Mortgage financing closed in August 2009 |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | 512,934 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = snh_MortgagesClosedIn2009Member |  |  |  |  |  |  |  |
Early repayment of debt variable portion |  | 199,197 snh_EarlyRepaymentOfSeniorSecuredDebtVariablePortion / us-gaap_DebtInstrumentAxis = snh_MortgagesClosedIn2009Member |  |  |  |  |  |  |  |
Previous unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Deferred financing fees and unamortized discounts written off | 357 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = snh_PriorLineOfCreditMember |  | 538 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = snh_PriorLineOfCreditMember | 3,897 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = snh_PriorLineOfCreditMember |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  |  |  |  |  |  |  | 3,078 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |
Mortgages |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  | 248 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember | 1,125 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember |  |  |  |  |  | 199 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember
Early repayment of debt variable portion |  |  |  |  | 199,197 snh_EarlyRepaymentOfSeniorSecuredDebtVariablePortion / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember | 23,234 snh_EarlyRepaymentOfSeniorSecuredDebtVariablePortion / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember |  |  |  |
Senior notes issued in April 2014 |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized | 5,021 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotesDue2019AndDue2024Member |  |  |  |  | 5,021 snh_DeferredDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotesDue2019AndDue2024Member |  |  |  |
Number of senior notes issued | 2 snh_NumberOfSeniorNotesIssued / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotesDue2019AndDue2024Member |  |  |  |  | 2 snh_NumberOfSeniorNotesIssued / us-gaap_DebtInstrumentAxis = snh_SeniorUnsecuredNotesDue2019AndDue2024Member |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  |  |  |  |  |  |  |  | 2,819 snh_DeferredDebtIssuanceCosts / 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

X
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- Definition Represents the amount of amortization expense pertaining to deferred financing costs expected to be recognized during year five of the five succeeding fiscal years. + References No definition available. + Details
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