XML 63 R46.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2016 community pooling_agreement agreement | Jun. 30, 2018 living_unit | Nov. 30, 2017 community property pooling_agreement renewal_option | Dec. 31, 2016 USD ($) community living_unit | Dec. 31, 2016 USD ($) community living_unit | Jun. 30, 2016 pooling_agreement lease_agreement | Dec. 31, 2018 USD ($) community living_unit | Dec. 31, 2018 USD ($) community living_unit | Dec. 31, 2018 USD ($) community living_unit | Dec. 31, 2018 USD ($) community living_unit lease_agreement | Dec. 31, 2018 USD ($) community living_unit management_agreement | Dec. 31, 2017 USD ($) community | Dec. 31, 2016 USD ($) community living_unit | Nov. 30, 2018 living_unit | Nov. 09, 2017 | Jun. 30, 2017 community | Dec. 31, 2015
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  | 185 | 185 |  | 184 | 184 | 184 | 184 | 184 | 185 | 185 |  |  |  |
Total rental income recognized | $ |  |  |  |  |  |  |  | $ 212,622 |  |  |  | $ 210,539 | $ 203,581 |  |  |  |
Rents receivable | $ |  |  |  | $ 18,320 | $ 18,320 |  | $ 18,697 | $ 18,697 | $ 18,697 | $ 18,697 | $ 18,697 | 18,539 | 18,320 |  |  |  |
Number of units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  | 238 |  |  |
Number of units that may be re-assigned to an existing or to a new long term lease |  |  |  |  |  |  | 1 | 1 | 1 | 1 | 1 |  |  |  |  |  |
Real estate improvements by lessee purchased | $ |  |  |  |  |  |  |  | $ 17,956 |  |  |  | 39,800 | 21,438 |  |  |  |
Increase in annual lease rent payable | $ |  |  |  |  |  |  |  | 1,433 |  |  |  | 3,193 | 1,719 |  |  |  |
Number of communities included in expansion and development project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Percentage in addition to rate applicable on outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Expenses from property management agreement transactions with related party | $ |  |  |  |  |  |  |  | 14,426 |  |  |  | $ 14,080 | $ 11,918 |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |
Property management agreement renewal period |  |  | 3 years |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Number of communities managed |  |  |  |  |  |  |  |  | 76 |  |  | 70 | 68 |  |  |  |
Number of pre-existing management agreements terminated | pooling_agreement | 3 |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements | 4 |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Number of management agreements | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement, number of communities subject to reset of annual minimum return | agreement | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements with related party to provide management services to entity | lease_agreement |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Expenses from property management agreement transactions with related party | $ |  |  |  |  |  |  |  | $ 6,442 |  |  |  | $ 7,525 | $ 7,707 |  |  |  |
A L Pooling Agreements | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement | renewal_option |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement renewal period |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | living_unit |  | 98 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of borrowings per annum |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage in addition to rate applicable on outstanding borrowings |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Management fees as a percentage of gross revenues |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee as a percentage of annual net operating income after realization of specified percentage of annual return |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement, annual return as a percentage of invested capital | 7.00% | 7.00% | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement, payment of capital expenditure as percentage of the funded amount |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  | 7.00%
Number of communities owned and managed by related party acquired during the period | property |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement renewal period |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Minimum | A L Pooling Agreements | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees as a percentage of gross revenues | 3.00% |  |  |  |  |  | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  |  |  |
Incentive fee as a percentage of annual net operating income after realization of specified percentage of annual return | 20.00% |  |  |  |  |  | 20.00% | 20.00% | 20.00% | 20.00% | 20.00% |  |  |  |  |  |
Property management agreement, annual return as a percentage of invested capital |  |  |  |  |  |  | 7.00% | 7.00% | 7.00% | 7.00% | 7.00% |  |  |  |  |  |
Maximum | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement renewal period |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Maximum | A L Pooling Agreements | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees as a percentage of gross revenues | 5.00% |  |  |  |  |  | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |  |  |  |  |  |
Incentive fee as a percentage of annual net operating income after realization of specified percentage of annual return | 35.00% |  |  |  |  |  | 35.00% | 35.00% | 35.00% | 35.00% | 35.00% |  |  |  |  |  |
Property management agreement, annual return as a percentage of invested capital |  |  |  |  |  |  | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% |  |  |  |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities not included in pooling agreement |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Georgia | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Georgia | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities associated with leases in default |  |  |  | 395 | 5 |  |  |  |  |  |  |  |  |  |  |  |
New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees as a percentage of gross revenues |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |  |  |  |  |  |
Number of communities owned and managed by related party | living_unit |  |  |  |  |  |  | 310 | 310 | 310 | 310 | 310 |  |  |  |  |  |
Incentive fee payable | $ |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities leased by the company |  |  |  | 185 | 185 |  |  |  |  |  |  | 185 | 185 |  |  |  |
Number of leases with related party | lease_agreement |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Annual rent as a percentage of gross revenues, percent |  |  |  |  |  |  | 4.00% | 4.00% | 4.00% | 4.00% | 4.00% |  |  |  |  |  |
Annual rent as a percentage of gross revenues, amount | $ |  |  |  |  |  |  |  | $ 5,525 |  |  |  | $ 5,533 | $ 5,686 |  |  |  |
Related party transaction, annual rents due | $ |  |  |  |  |  |  |  | $ 207,664 |  |  |  |  |  |  |  |  |
Five Star | Lease No. 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  | 82 |  |  |  |  |  |  |  |
Five Star | Lease No. 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  | 47 |  |  |  |  |  |  |  |
Five Star | Lease No. 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |
Five Star | Lease No. 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  | 29 |  |  |  |  |  |  |  |
Five Star | Lease No. 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |
Acquisitions | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units | living_unit |  |  |  | 709 | 709 |  | 366 | 366 | 366 | 366 | 366 |  | 709 |  |  |  |
Acquisitions | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities managed |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of management agreements | pooling_agreement |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities owned and managed by related party acquired during the period | property |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions | Alabama and Indiana | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities owned and managed by related party acquired during the period | property |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions | Tennessee | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities owned and managed by related party acquired during the period | property |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions | Arizona | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities owned and managed by related party acquired during the period | property |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights |  |  |  |  |  |  | 9.80% | 9.80% | 9.80% | 9.80% | 9.80% |  |  |  |  |  |

X
- Definition Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_IncreaseDecreaseOperatingLeasesAnnualRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the minimum percentage of common stock held in the investee above which the entity would have the option to cancel all its rights. + References No definition available. + Details
Name: | snh_MinimumInvestmentOwnershipPercentageEligibleForOptionToCancelRightsOfLessee
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of agreements with a related party that is to provide management services to the entity. + References No definition available. + Details
Name: | snh_NumberOfAgreementsWithRelatedPartyToProvideManagementServicesToEntity
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Definition Represents the number of pre-existing management agreements. + References No definition available. + Details
Name: | snh_NumberOfPreExistingManagementAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Pre-Existing Management Agreements Terminated + References No definition available. + Details
Name: | snh_NumberOfPreExistingManagementAgreementsTerminated
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Units That May Be Re-Assigned To An Existing Or New Long Term Lease + References No definition available. + Details
Name: | snh_NumberOfUnitsThatMayBeReAssignedToAnExistingOrToANewLongTermLease
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Communities Associated With Leases in Default + References No definition available. + Details
Name: | snh_NumberofCommunitiesAssociatedWithLeasesinDefault
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Communities Included in Expansion and Development Project + References No definition available. + Details
Name: | snh_NumberofCommunitiesIncludedinExpansionandDevelopmentProject
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Communities Leased by the Company + References No definition available. + Details
Name: | snh_NumberofCommunitiesLeasedbytheCompany
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Communities Owned and Managed by Related Party + References No definition available. + Details
Name: | snh_NumberofCommunitiesOwnedandManagedbyRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Communities Owned and Managed by Related Party, Acquired During the Period + References No definition available. + Details
Name: | snh_NumberofCommunitiesOwnedandManagedbyRelatedPartyAcquiredDuringthePeriod
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Communities not Included in Pooling Agreement + References No definition available. + Details
Name: | snh_NumberofCommunitiesnotIncludedinPoolingAgreement
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Leases With Related Party + References No definition available. + Details
Name: | snh_NumberofLeasesWithRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Management Agreements + References No definition available. + Details
Name: | snh_NumberofManagementAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + References No definition available. + Details
Name: | snh_RealEstateImprovementsByLesseePurchased
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Related Party Transaction, Annual Rent Increase Percentage in Addition to Rate Applicable on Outstanding Borrowings + References No definition available. + Details
Name: | snh_RelatedPartyTransactionAnnualRentIncreasePercentageInAdditiontoRateApplicableonOutstandingBorrowings
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related Party Transaction, Annual Rents Due + References No definition available. + Details
Name: | snh_RelatedPartyTransactionAnnualRentsDue
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty
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 Related Party Transaction, Percentage Of Borrowings Per Annum Under Revolving Credit Facility + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPercentageOfBorrowingsPerAnnumUnderRevolvingCreditFacility
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the annual return as a percentage of the entity's invested surplus used to determine the incentive fee payable to related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementAnnualReturnAsPercentageOfInvestedCapital
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the incentive fee payable to related parties under property management agreement expressed as a percentage of the annual net operating income after the entity realizes an annual return equal to specified percentage of its invested capital. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementIncentiveFeeAsPercentageOfAnnualNetOperatingIncomeAfterRealizationOfSpecifiedPercentageOfAnnualReturn
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the management fees payable to related parties under property management agreement expressed as a percentage of gross revenues. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementManagementFeesAsPercentageOfGrossRevenues
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 Related Party Transaction, Property Management Agreement, Number of Communities Subject to Reset of Annual Minimum Return + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementNumberofCommunitiesSubjecttoResetofAnnualMinimumReturn
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the payment of management capital expenditure as a percentage of amount funded by the company. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementPaymentofCapitalExpenditureasPercentageoftheFundedAmount
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of years for which the entity has the option to renew the agreement. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementRenewalPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the annual rent as a percentage of the entity's gross revenues. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionTransactionAgreementAnnualRentasaPercentageofGrossRevenues
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related Party Transaction, Transaction Agreement Annual Rent as a Percentage of Gross Revenues, Amount + References No definition available. + Details
Name: | snh_RelatedPartyTransactionTransactionAgreementAnnualRentasaPercentageofGrossRevenuesAmount
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents rents receivable at the balance sheet date. + References No definition available. + Details
Name: | snh_RentsReceivable
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of units (items of property) under operating lease arrangements. + References No definition available. + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_GA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_NY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=snh_FiveStarQualityCareIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=snh_LeaseNo.1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=snh_LeaseNo.2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=snh_LeaseNo.3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=snh_LeaseNo.4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=snh_LeaseNo.5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=snh_AlabamaAndIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_TN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_AZ
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=snh_FiveStarQualityCareIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |