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Related Person Transactions - Management Fees and Reimbursements (Details) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | May 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Related person transactions |  |  |  |  |
Property management and construction supervision fees | $ 2,686 | $ 2,532 |  | $ 5,232 | $ 4,969
Property management and construction supervision fees paid | 2,171 | 1,494 |  | 4,299 | 3,235
RMR LLC |  |  |  |  |
Related person transactions |  |  |  |  |
Business management fees incurred | 9,243 | 9,144 |  | 17,590 | 18,014
Incentive fees payable | 0 | 0 |  | 0 | 0
Common shares issued as payment for base business management fee |  |  | 68,983 |  |
Accrual for RMR LLC employee share grants and internal audit costs | $ 589 | $ 316 |  | $ 1,174 | $ 777

X
- Definition Represents the expense amount accrued for employee share grants and internal audit costs to RMR LLC employees. + References No definition available. + Details
Name: | snh_AccrualForEmployeeShareGrants
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the business management fees incurred pursuant to business management agreement with related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementFees
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the incentive fee payable in a related party transaction. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionIncentiveFeePayable
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the property management and construction supervision fees paid to related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFeesPaid
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=snh_ReitManagementAndResearchLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |