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v3.19.1

Business and Property Management Agreements with RMR LLC (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) employee management_agreement property | Mar. 31, 2018 USD ($)
Related person transactions |  |  |
Number of employees | employee |  | 0 |
Related party transaction business management agreement incentive fee paid | $ 40,642,000 |  |
Property management and construction supervision fees |  | $ 3,064,000 | $ 2,821,000
Property management and construction supervision fees paid |  | 3,374,000 | 2,779,000
RMR LLC |  |  |
Related person transactions |  |  |
Business management fees incurred |  | 7,719,000 | 23,323,000
Related party transaction business management fees related to subsidiary level management |  | 725,000 | 725,000
Related party transaction business management agreement, annual incentive fee estimate included in management fees |  | $ 0 | $ 14,347,000
Senior Living Communities | RMR Inc |  |  |
Related person transactions |  |  |
Number of consecutive renewal terms of agreement | management_agreement |  | 2 |
Number of communities managed by related party | property |  | 1 |

X
- Definition Represents the number of communities managed by a related party. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of persons employed by a related party of the entity. + References No definition available. + Details
Name: | snh_RelatedPartyEmployeesNumber
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related Party Transaction, Business Management Agreement Annual Incentive Fee Estimate Included in Management Fees + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related Party Transaction Business Management Agreement Incentive Fee Paid + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid
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

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- Definition Related Party Transaction Business Management Fees Related to Subsidiary Level Management + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- 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
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=snh_ReitManagementAndResearchLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=snh_SeniorLivingCommunityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=snh_ReitManagementAndResearchIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |