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Related Person Transactions - Five Star (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
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Oct. 31, 2016 living_unit | Oct. 31, 2016 community | Sep. 30, 2016 USD ($) community shares | Jun. 29, 2016 USD ($) community lease_agreement pooling_agreement management_agreement | Sep. 30, 2016 USD ($) community living_unit shares | May 31, 2016 USD ($) | Dec. 31, 2016 USD ($) living_unit community | Sep. 30, 2016 USD ($) community shares | Mar. 31, 2016 community | Sep. 30, 2015 USD ($) community | Sep. 30, 2016 USD ($) community shares | Sep. 30, 2015 USD ($) community | Apr. 30, 2016 living_unit | Dec. 31, 2015 USD ($) | May 31, 2015 | Dec. 31, 2001
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Units That May Be Re-Assigned To An Existing Or To A New Long Term Lease | community |  |  | 1 |  | 1 |  |  | 1 |  |  | 1 |  |  |  |  |
Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  | 8.60% |  | 8.60% |  |  | 8.60% |  |  | 8.60% |  |  |  |  | 100.00%
Investment in common shares (in shares) | shares |  |  | 4,235,000 |  | 4,235,000 |  |  | 4,235,000 |  |  | 4,235,000 |  |  |  |  |
Number of pre-existing agreements | lease_agreement |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Number of management agreements used by one pooling agreement | management_agreement |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Number of management agreements used by nine pooling agreements | management_agreement |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased | community |  |  | 183 |  | 183 |  |  | 183 |  | 178 | 183 | 178 |  |  |  |
Total rental income recognized |  |  |  |  |  |  |  | $ 50,417,000 |  | $ 47,828,000 | $ 146,758,000 | $ 143,271,000 |  |  |  |
Estimated percentage rent payments received |  |  |  |  |  |  |  | 1,367,000 |  | 1,371,000 | 4,228,000 | 4,194,000 |  |  |  |
Rents receivable |  |  | $ 16,831,000 |  | $ 16,831,000 |  |  | 16,831,000 |  |  | 16,831,000 |  |  | $ 17,466,000 |  |
Payment of capital expenditure |  |  |  |  |  |  |  | 266,000 |  |  | 266,000 |  |  |  |  |
Five Star | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business management fees incurred |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  | $ 112,350,000 |  |  |  |  |  |  |  |  |  |  |  |
Initial annual rent |  |  |  | $ 8,426,000 |  |  |  |  |  |  |  |  |  |  |  |
Annual rent percentage (as a percent) |  |  |  | 0.04 |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement | lease_agreement |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Renewal period |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-existing management agreements terminated | pooling_agreement |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Number of new management agreements entered | pooling_agreement |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  |  |  | 3,470,000 |  | 7,523,000 | 15,306,000 | 16,425,000 |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  | 279,000 |  | 604,000 | 1,228,000 | $ 1,322,000 |  |  |  |
Number of properties acquired, referred to as managed properties | community |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |  |
Property management agreement expense |  |  |  |  |  |  |  | 3,070,000 |  | $ 2,717,000 | $ 8,689,000 | $ 7,939,000 |  |  |  |
Five Star | Senior Living Communities | Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |  |  |  |  |
Five Star | Senior Living Communities | North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  | 288 |  |  |
Five Star | Living Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired living units | living_unit |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Five Star | Living Unit | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  | $ 130,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Five Star | New Pooling Agreements Which Combine Six AL Management Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of combination or pooling agreements | pooling_agreement |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |
Five Star | New Pooling Agreement Which Combine Five AL Management Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of combination or pooling agreements | pooling_agreement |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Five Star | First AL Pooling Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees as a percentage of gross revenues |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  | 3.00% |
Incentive fee as percentage of the annual net operating income after the entity realizes an annual return equal to 8% of invested capital |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  | 35.00% |
Payment of capital expenditure as a percentage of the amount funded by entity |  |  |  | 0.03 |  |  |  |  |  |  |  |  |  | 0.07 |  |
Number of consecutive period during which the entity must not receive the minimum return for the property management agreement to be subject to the pooling agreement |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual rent from Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,610,000 |  |
Five Star | First AL Pooling Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual return as a percentage of invested surplus specified as a base for determining incentive fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |
Five Star | First AL Pooling Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual return as a percentage of invested surplus specified as a base for determining incentive fee |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Five Star | First AL Pooling Agreement | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual return as a percentage of invested surplus specified as a base for determining incentive fee |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |
Discontinued Operations, Disposed of by Sale | Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  | $ 248,000 |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Five Star | Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold and agreed to be sold |  |  |  |  | $ 248,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Five Star | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties managed by significant tenant | 350 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties managed by significant tenant | community |  |  |  |  |  |  |  |  |  |  | 63 |  |  |  |  |
Scenario, Forecast | Triple Net Leased Senior Living Communities | Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | community |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of acquired living units | living_unit |  |  |  |  |  |  | 126 |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  |  | $ 18,600,000 |  |  |  |  |  |  |  |  |

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- Definition Represents the deferred estimated percentage rent payments received during the period. + References No definition available. + Details
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- 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
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- Definition Represents the number of private pay independent living units within communities acquired. + References No definition available. + Details
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- Definition Represents the number of pooling agreement. + References No definition available. + Details
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Period Type: | instant

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- Definition Represents the number of pre-existing management agreements. + References No definition available. + Details
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- Definition Number of Pre-Existing Management Agreements Terminated + References No definition available. + Details
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- Definition Represents the number of properties acquired or agreed to be acquired by the entity. + References No definition available. + Details
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- Definition Represents the number of properties acquired or agreed to be acquired by the entity during the period, which are referred by the entity as managed properties. + References No definition available. + Details
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- 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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- Definition Number Of Separate Management Agreements Used by Nine Pooling Agreements + References No definition available. + Details
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- Definition Number Of Separate Management Agreements Used by One Pooling Agreement + References No definition available. + Details
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- Definition Number Of Units That May Be Re-Assigned To An Existing Or New LOng Term Lease + References No definition available. + Details
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- Definition Number of Properties Managed By Significant Tenant + References No definition available. + Details
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- Definition Represents the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
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- Definition This element represents the aggregate purchase price of real estate properties acquired by the entity during the period. This amount includes cash paid plus debt assumed, if any, and other settlement adjustments but excludes closing costs. + References No definition available. + Details
Name: | snh_RealEstateAggregatePurchasePriceIncludingOtherSettlementAdjustments
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- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity. + References No definition available. + Details
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- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + References No definition available. + Details
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- Definition Represents the business management fees incurred pursuant to business management agreement with related parties. + References No definition available. + Details
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- 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
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- 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
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- 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
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- 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
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- Definition Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. + References No definition available. + Details
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- Definition Represents the payment of management capital expenditure as a percentage of amount funded by the company. + References No definition available. + Details
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- Definition Related Party Transaction Property Management Agreement, Payment of Capital Expenditure + References No definition available. + Details
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- Definition Represents the number of years for which the entity has the option to renew the agreement. + References No definition available. + Details
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- Definition Represents the number of consecutive period during which the entity must not receive the minimum return for the property management agreement to be subject to the pooling agreement. + References No definition available. + Details
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- Definition Represents the annual rent as a percentage of the entity's gross revenues. + References No definition available. + Details
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- Definition Represents rents receivable at the balance sheet date. + References No definition available. + Details
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- Definition Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.11) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Balance held at close of period in number of shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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