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Summary of Significant Accounting Policies (Details 3) (AIC) | Dec. 31, 2014 item
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AIC |
Equity method investments |
Number of other companies which are shareholders of equity method investee | 6 snh_NumberOfOtherCompaniesWhichAreShareholdersOfRelatedParty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = snh_AffiliatesInsuranceCompanyMember
Equity Method Investment, Ownership Percentage | 14.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = snh_AffiliatesInsuranceCompanyMember
The entity owns less than this percentage of an equity method investment | 20.00%snh_EquityMethodInvestmentOwnershipPercentageHeld / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = snh_AffiliatesInsuranceCompanyMember

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- Definition The entity owns less than this percentage of an equity method investment. + References No definition available. + Details
Name: | snh_EquityMethodInvestmentOwnershipPercentageHeld
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of other companies which are shareholders of related party of the entity. + References No definition available. + Details
Name: | snh_NumberOfOtherCompaniesWhichAreShareholdersOfRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration