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Real Estate Properties (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) ft² property community building item | May. 31, 2015 USD ($) state property item | May. 31, 2015 USD ($) state community item | May. 31, 2015 USD ($) state item | May. 31, 2015 USD ($) state item | Jan. 31, 2015 USD ($) ft² state property building | Dec. 31, 2014 USD ($) community item | Sep. 30, 2015 USD ($) ft² property community building item | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) property community building item
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties owned | property | 428 |  |  |  |  |  |  | 428 |  |
Number of buildings owned | building | 452 |  |  |  |  |  |  | 452 |  |
Number of states in which properties are located | item | 43 |  |  |  |  |  |  | 43 |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  | $ 181,432 | $ 15,630 |
Senior living communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  | 19 |  |
Senior living communities | Five Star | TRS |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  | $ 9,750 |  |  |  |  |
Triple Net Leased Net Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  | 20 |  |  |  |  |  |  |
Managed Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  | 5
Number of living units | item |  |  |  |  |  |  | 395 |  |  | 395
Managed Senior Living Communities | Five Star |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  | 14
Fees paid to terminate the agreement |  |  |  |  |  |  | $ 975 |  |  | $ 975
Number of living units | item |  |  |  |  |  |  | 838 |  |  | 838
Acquisition |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  | 23 |  |
Assumption of mortgage notes payable |  |  |  |  |  | $ 29,955 |  |  |  |
Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community | 1 |  | 37 |  |  |  |  |  |  |
Weighted average interest rate on debt (as a percent) | 4.57% |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | 39 | 1 | 39 |  |  |  |  |  |  | 2
Number of living units | item | 3,563 | 40 | 40 | 40 | 40 |  |  | 3,563 |  |
Cash Paid plus Assumed Debt, excluding closing costs | $ 817,076 |  |  |  | $ 9,750 |  |  |  |  |
Intangible lease assets recorded | 130,305 |  |  |  |  |  |  | $ 130,305 |  |
Other liabilities recorded | (19,091) | $ 1,000 | $ 1,000 | $ 1,000 | 1,000 |  |  | $ (19,091) |  |
Assumption of mortgage notes payable | (151,477) |  |  |  | $ 151,477 |  |  |  |  |
Premium on Assumed Debt | $ (858) |  |  |  |  |  |  |  |  |
Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property | 1 |  |  |  |  |  |  |  |  |
Number of living units | item | 87 |  |  |  |  |  |  | 87 |  |
Cash Paid plus Assumed Debt, excluding closing costs | $ 17,548 |  |  |  |  |  |  |  |  |
Intangible lease assets recorded | 2,208 |  |  |  |  |  |  | $ 2,208 |  |
Assumption of mortgage notes payable | (12,297) |  |  |  |  |  |  |  |  |
Premium on Assumed Debt | $ (565) |  |  |  |  |  |  |  |  |
Acquisition | Senior living communities | Five Star |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of living units | item |  | 838 | 838 | 838 | 838 |  |  |  |  |
Acquisition | Senior living community subtotal |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property | 38 |  |  |  |  |  |  |  |  |
Number of living units | item | 3,439 |  |  |  |  |  |  | 3,439 |  |
Cash Paid plus Assumed Debt, excluding closing costs | $ 790,076 |  |  |  |  |  |  |  |  |
Intangible lease assets recorded | 130,145 |  |  |  |  |  |  | $ 130,145 |  |
Other liabilities recorded | (18,091) |  |  |  |  |  |  | $ (18,091) |  |
Assumption of mortgage notes payable | (151,477) |  |  |  |  |  |  |  |  |
Premium on Assumed Debt | $ (858) |  |  |  |  |  |  |  |  |
Acquisition | Triple Net Leased Net Senior Living Communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  | 19
Weighted average amortization period |  |  |  |  |  |  |  |  |  | 11 years 6 months
Number of states in which property is located | state |  | 11 | 11 | 11 | 11 |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  | 1 |  |
Number of living units | item | 84 |  |  |  |  |  | 2,206 | 84 |  | 2,206
Cash Paid plus Assumed Debt, excluding closing costs |  |  |  |  |  |  |  | $ 18,250 |  |
Acquisition | Triple Net Leased Net Senior Living Communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of operators | item |  |  |  |  |  |  |  |  |  | 7
Acquisition | Managed Senior Living Communities | TRS |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  |  |  |  | 19
Number of living units | item |  |  |  |  |  |  | 1,233 |  |  | 1,233
Acquisition | MOBs |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  | $ 531,623 |  | $ 531,623 |  |
Weighted average interest rate on debt (as a percent) |  |  |  |  |  | 4.73% |  |  |  |
Number of states in which property is located | state |  |  |  |  |  | 12 |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  | 23 |  | 23 |  | 2
Cash Paid plus Assumed Debt, excluding closing costs |  |  |  |  |  | $ 539,000 |  |  |  |
Intangible lease assets recorded | $ 85,496 |  |  |  |  | 85,496 |  | $ 85,496 |  |
Assumption of mortgage notes payable |  |  |  |  |  | (29,955) |  | (29,955) |  | $ 15,630
Premium on Assumed Debt |  |  |  |  |  | $ (1,074) |  | $ (1,074) |  |
Number of buildings acquired | building |  |  |  |  |  | 23 |  |  |  | 3
Additional consideration excluded from purchase price |  |  |  |  |  | $ 7,377 |  |  |  |
Area of real estate properties (in square feet) | ft² | 2,170 |  |  |  |  | 2,170 |  | 2,170 |  |
Intangible lease liabilities recorded | $ (3,298) |  |  |  |  | $ (3,298) |  | $ (3,298) |  |
Acquisition | MOBs | Above market lease |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 9 years 9 months 18 days |  |  |  |
Acquisition | MOBs | In-place lease intangibles |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 9 years 6 months |  |  |  |
Acquisition | MOBs | Below market lease |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 11 years 1 month 6 days |  |  |  |
Agreement to acquire | Senior living communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of communities | community |  |  |  |  |  |  | 38 |  |  | 38
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  |  |  |  |  | $ 790,000
Net closing adjustments |  |  |  |  |  |  |  |  |  | $ 76
Weighted average interest rate on debt (as a percent) |  |  |  | 4.57% |  |  |  |  |  |
Number of living units | item |  |  |  |  |  |  | 3,439 |  |  | 3,439
Assumption of mortgage notes payable |  |  |  |  | $ 151,477 |  |  |  |  |
Land | Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 45,935 |  |  |  |  |  |  |  |  |
Land | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 1,134 |  |  |  |  |  |  |  |  |
Land | Acquisition | Senior living community subtotal |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 43,117 |  |  |  |  |  |  |  |  |
Land | Acquisition | MOBs |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  |  | $ 58,294 |  | 58,294 |  |
Buildings and improvements | Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 625,878 |  |  |  |  |  |  |  |  |
Buildings and improvements | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 13,749 |  |  |  |  |  |  |  |  |
Buildings and improvements | Acquisition | Senior living community subtotal |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 601,284 |  |  |  |  |  |  |  |  |
Buildings and improvements | Acquisition | MOBs |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  |  | $ 392,205 |  | $ 392,205 |  |
Furniture, fixtures and equipment | Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 34,907 |  |  |  |  |  |  |  |  |
Furniture, fixtures and equipment | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 1,022 |  |  |  |  |  |  |  |  |
Furniture, fixtures and equipment | Acquisition | Senior living community subtotal |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | $ 34,481 |  |  |  |  |  |  |  |  |
11 States | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  | 18 |  |  |  |  |  |  |  |
Number of living units | item |  | 2,119 | 2,119 | 2,119 | 2,119 |  |  |  |  |
Cash Paid plus Assumed Debt, excluding closing costs |  |  |  |  | $ 459,183 |  |  |  |  |
Intangible lease assets recorded |  | $ 54,096 | $ 54,096 | $ 54,096 | 54,096 |  |  |  |  |
Other liabilities recorded |  | $ (18,091) | $ (18,091) | $ (18,091) | (18,091) |  |  |  |  |
Assumption of mortgage notes payable |  |  |  |  | (44,395) |  |  |  |  |
Premium on Assumed Debt |  |  |  |  | (1,125) |  |  |  |  |
11 States | Land | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | 29,715 |  |  |  |  |
11 States | Buildings and improvements | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | 373,471 |  |  |  |  |
11 States | Furniture, fixtures and equipment | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | $ 21,117 |  |  |  |  |
5 States | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  | 19 |  |  |  |  |  |  |  |
Number of living units | item |  | 1,233 | 1,233 | 1,233 | 1,233 |  |  |  |  |
Cash Paid plus Assumed Debt, excluding closing costs |  |  |  |  | $ 313,345 |  |  |  |  |
Intangible lease assets recorded |  | $ 73,840 | $ 73,840 | $ 73,840 | 73,840 |  |  |  |  |
Assumption of mortgage notes payable |  |  |  |  | (94,786) |  |  |  |  |
Premium on Assumed Debt |  |  |  |  | 832 |  |  |  |  |
5 States | Land | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | 12,267 |  |  |  |  |
5 States | Buildings and improvements | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | 214,064 |  |  |  |  |
5 States | Furniture, fixtures and equipment | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | $ 12,342 |  |  |  |  |
Georgia | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property | 1 |  |  |  |  |  |  |  |  |
Number of living units | item | 84 |  |  |  |  |  |  | 84 |  |
Cash Paid plus Assumed Debt, excluding closing costs | $ 18,250 |  |  |  |  |  |  |  |  |
Georgia | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Number of living units | item |  | 40 | 40 | 40 | 40 |  |  |  |  |
Cash Paid plus Assumed Debt, excluding closing costs |  |  |  |  | $ 8,750 |  |  |  |  |
Intangible lease assets recorded |  | $ 161 | $ 161 | $ 161 | 161 |  |  |  |  |
Other liabilities recorded |  | $ (1,000) | $ (1,000) | $ (1,000) | (1,000) |  |  |  |  |
Georgia | Land | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | 1,825 |  |  |  |  |  |  |  |  |
Georgia | Land | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | 993 |  |  |  |  |
Georgia | Buildings and improvements | Acquisition | Senior living communities | Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded | $ 16,425 |  |  |  |  |  |  |  |  |
Georgia | Buildings and improvements | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | 8,169 |  |  |  |  |
Georgia | Furniture, fixtures and equipment | Acquisition | Senior living communities | Non Leasing Member |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |
Property plant and equipment recorded |  |  |  |  | $ 427 |  |  |  |  |

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- Definition Weighted average interest rate on debt during the period. + References No definition available. + Details
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- Definition The amount of premium on assumed debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. + References No definition available. + Details
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- Definition Represents the number of buildings owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the number of buildings acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Represents the number of communities. + 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 operators or property managers. + References No definition available. + Details
Name: | snh_NumberOfOperators
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the number of properties acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Represents the number of states in which the comapnies property is located. + References No definition available. + Details
Name: | snh_NumberOfStatesInWhichProertyIsLocated
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the aggregate purchase price excluding closing costs, of real estate properties acquired by the entity during the period. + References No definition available. + Details
Name: | snh_RealEstateAggregatePurchasePrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
Namespace Prefix: | snh_
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- Definition This element represents the net closing adjustments of real estate properties acquired by the entity during the period. This amount excludes closing costs. + References No definition available. + Details
Name: | snh_RealEstateOtherClosingAdjustments
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + References No definition available. + Details
Name: | snh_RealEstatePropertiesAcquiredIntangibleLeaseAssets
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the intangible lease liabilities recorded as part of the real estate acquisition. + References No definition available. + Details
Name: | snh_RealEstatePropertiesAcquiredIntangibleLeaseLiabilities
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the other liabilities recorded related to real estate property acquisitions. + References No definition available. + Details
Name: | snh_RealEstatePropertiesAcquiredOtherLiabilities
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the property plant and equipment assets recorded as part of the real estate acquisition. + References No definition available. + Details
Name: | snh_RealEstatePropertiesAcquiredPropertyPlantAndEquipment
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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