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Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended | 43 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 property item | May 31, 2011 property | Dec. 31, 2014 property item
DEFERRED LEASING COSTS |  |  |  |  |  |
Unamortized gross balance of deferred leasing costs | $ 14,844 us-gaap_DeferredCostsLeasingGross | $ 3,722 us-gaap_DeferredCostsLeasingGross |  | 14,844 us-gaap_DeferredCostsLeasingGross |  | 14,844 us-gaap_DeferredCostsLeasingGross
Accumulated amortization | 10,542 us-gaap_DeferredCostsLeasingAccumulatedAmortization | 2,687 us-gaap_DeferredCostsLeasingAccumulatedAmortization |  | 10,542 us-gaap_DeferredCostsLeasingAccumulatedAmortization |  | 10,542 us-gaap_DeferredCostsLeasingAccumulatedAmortization
Weighted average amortization period for deferred leasing cost | 7 years 6 months |  |  |  |  |
Expected amortization expense for the five years |  |  |  |  |  |
Expected amortization expense, 2015 | 1,945 snh_DeferredCostsLeasingExpectedFutureAmortizationYearOne |  |  | 1,945 snh_DeferredCostsLeasingExpectedFutureAmortizationYearOne |  | 1,945 snh_DeferredCostsLeasingExpectedFutureAmortizationYearOne
Expected amortization expense, 2016 | 1,789 snh_DeferredCostsLeasingExpectedFutureAmortizationYearTwo |  |  | 1,789 snh_DeferredCostsLeasingExpectedFutureAmortizationYearTwo |  | 1,789 snh_DeferredCostsLeasingExpectedFutureAmortizationYearTwo
Expected amortization expense, 2017 | 1,527 snh_DeferredCostsLeasingExpectedFutureAmortizationYearThree |  |  | 1,527 snh_DeferredCostsLeasingExpectedFutureAmortizationYearThree |  | 1,527 snh_DeferredCostsLeasingExpectedFutureAmortizationYearThree
Expected amortization expense, 2018 | 1,358 snh_DeferredCostsLeasingExpectedFutureAmortizationYearFour |  |  | 1,358 snh_DeferredCostsLeasingExpectedFutureAmortizationYearFour |  | 1,358 snh_DeferredCostsLeasingExpectedFutureAmortizationYearFour
Expected amortization expense, 2019 | 1,180 snh_DeferredCostsLeasingExpectedFutureAmortizationYearFive |  |  | 1,180 snh_DeferredCostsLeasingExpectedFutureAmortizationYearFive |  | 1,180 snh_DeferredCostsLeasingExpectedFutureAmortizationYearFive
Expected amortization expense, thereafter | 3,183 snh_DeferredCostsLeasingExpectedFutureAmortizationYearAfterYearFive |  |  | 3,183 snh_DeferredCostsLeasingExpectedFutureAmortizationYearAfterYearFive |  | 3,183 snh_DeferredCostsLeasingExpectedFutureAmortizationYearAfterYearFive
Revenue Recognition |  |  |  |  |  |
Percentage rents earned | $ 10,155 us-gaap_PercentageRent | $ 9,226 us-gaap_PercentageRent | $ 10,859 us-gaap_PercentageRent |  |  |
Segment Reporting |  |  |  |  |  |
Number of Operating Segments | 4 us-gaap_NumberOfOperatingSegments |  |  |  |  |
Number of Reportable Segments | 3 us-gaap_NumberOfReportableSegments |  |  |  |  |
Senior living communities | Five Star |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | 46 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  | 2 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember | 6 snh_NumberOfPropertiesAcquired / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember | 36 snh_NumberOfPropertiesAcquired / 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 |  |  |  |  |
Number of real estate properties leased | 10 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  |  | 10 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember |  | 10 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = snh_SeniorLivingCommunityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = snh_FiveStarQualityCareIncMember

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- Definition Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for deferred leasing costs. + References No definition available. + Details
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- Definition Represents the weighted average amortization period for deferred leasing costs. + References No definition available. + Details
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- 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
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- 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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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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- Definition For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition This element represents the rental revenue earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Such rental revenue is generally stipulated in the lease agreement, usually will provide for a fixed percentage of revenue to be paid as additional (or possibly only) rent due the lessor, and may be based on gross revenues, net revenues, or multiple variations thereof. Percentage rent is often required under leases with retail outlets located on premises owned by hoteliers, cruise lines, others in the hospitality industry, and shopping mall operators, among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + 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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