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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended
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Nov. 09, 2017 property | Jun. 29, 2016 USD ($) community pooling_agreement lease_agreement agreement | Nov. 30, 2017 pooling_agreement renewal_option | Dec. 31, 2016 USD ($) living_unit community | Dec. 31, 2016 USD ($) community | Jun. 30, 2016 pooling_agreement lease_agreement | Sep. 30, 2015 community | May 31, 2015 community | Feb. 28, 2015 USD ($) | Dec. 31, 2017 USD ($) living_unit community lease_agreement | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) community | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) community | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2015 community | Dec. 31, 2017 USD ($) living_unit community lease_agreement | Dec. 31, 2017 USD ($) living_unit community lease_agreement | Dec. 31, 2017 USD ($) living_unit community lease_agreement | Dec. 31, 2017 USD ($) living_unit community lease_agreement | Dec. 31, 2017 USD ($) living_unit community lease_agreement management_agreement | Dec. 31, 2016 USD ($) community | Dec. 31, 2015 USD ($) community
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 305 |  |  |  |
Revenues | $ |  |  |  |  |  |  |  |  |  | $ 278,566 | $ 266,679 | $ 265,013 | $ 264,561 | $ 274,296 | $ 263,983 | $ 261,367 | $ 258,375 |  |  | $ 1,074,819 |  |  |  | $ 1,058,022 | $ 998,773
Real estate improvements by lessee purchased | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,952 |  |  |  | 30,328 |
Increase (decrease) in annual lease rent payable | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,870 |  |  |  | 2,393 |
Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |
Related Party Transaction, Number Of Subleases | lease_agreement |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  | 1 | 1 | 1 | 1 | 1 |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Communities Included in Expansion and Development Project |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Annual Rent Increase Percentage In Addition to Rate Applicable on Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,539 |  |  |  |  |
Total rental income recognized | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 203,581 | 196,919
Rents receivable | $ |  |  |  | $ 18,320 | $ 18,320 |  |  |  |  | $ 18,539 |  |  |  | $ 18,320 |  |  |  |  | $ 18,539 | $ 18,539 | $ 18,539 | $ 18,539 | $ 18,539 | 18,320 |
Number of units that may be re-assigned to an existing or to a new long term lease |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  | 1 | 1 | 1 | 1 | 1 |  |
Real estate improvements by lessee purchased | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,800 |  |  |  | 21,438 | 21,444
Increase (decrease) in annual lease rent payable | $ |  |  |  |  |  |  |  |  | $ 39 |  |  |  |  |  |  |  |  |  |  | $ 3,193 |  |  |  | 1,719 | 1,734
Number of communities associated with leases in default |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements | lease_agreement |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements terminated | pooling_agreement |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% | 9.80% |  |
Expenses from property management agreement transactions with related party | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,080 |  |  |  | $ 11,918 | $ 10,728
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |
Property management agreement renewal period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Number of communities managed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |  | 68 | 60
Number of pre-existing management agreements | pooling_agreement |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of management agreements |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements terminated | pooling_agreement |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of separate management agreements entered for communities acquired | pooling_agreement |  |  |  |  |  | 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 | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,525 |  |  |  | $ 7,707 | $ 7,737
A L Pooling Agreements | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Annual Rent Increase Percentage In Addition to Rate Applicable on Outstanding Borrowings | 2.00% |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement |  | 8 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement renewal period |  | 5 years | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement, payment of capital expenditure as percentage of the funded amount | 3.00% | 3.00% |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  | 7.00% | 7.00% | 7.00% | 7.00% | 7.00% |  |
Incentive fee payable | $ |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% | 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% | 20.00% |  |
Property management agreement, annual return as a percentage of invested capital |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  | 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% | 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% | 35.00% |  |
Property management agreement, annual return as a percentage of invested capital |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% |  |
Georgia | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities associated with leases in default |  |  |  | 395 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities not included in pooling agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
NEW YORK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities owned and managed by related party | living_unit |  |  |  |  |  |  |  |  |  | 310 |  |  |  |  |  |  |  |  | 310 | 310 | 310 | 310 | 310 |  |
Management fees as a percentage of gross revenues |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |  |
Incentive fee payable | $ |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities leased by the company |  |  |  | 185 | 185 |  |  |  |  | 185 |  |  |  | 185 |  |  |  |  | 185 | 185 | 185 | 185 | 185 | 185 | 177
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% | 4.00% |  |
Annual rent as a percentage of gross revenues, amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,533 |  |  |  | $ 5,686 | $ 5,666
Related party transaction, annual rents due | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 206,329 |  |  |  |  |
Five Star | Lease No. 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83 |  |  |  |
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 communities |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities managed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Number of communities owned and managed by related party acquired during the period | property | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of management agreements | pooling_agreement |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rents from significant lessee | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,074,819 |  |  |  | 1,058,022 |
Rents from significant lessee | Five Star | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,539 |  |  |  | $ 203,581 |

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

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- 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 Represents the number of separate management agreements entered for communities acquired, upon termination of a pre-existing combined management agreement. + References No definition available. + Details
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