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Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 item building property state | Mar. 31, 2013 | Mar. 31, 2014 MOB item sqft building property | Dec. 31, 2013 MOB property building sqft | Mar. 31, 2014 Senior living communities item | Dec. 31, 2013 Senior living communities item | Aug. 31, 2013 Senior living communities Five Star property item | Mar. 31, 2014 Senior living communities Five Star item | Apr. 30, 2014 Sale MOB Subsequent event property building | Jan. 31, 2014 Sale Senior living communities Five Star property item | Aug. 31, 2013 Sale Senior living communities Five Star item | Apr. 30, 2014 Acquisition MOB Subsequent event building property sqft | Feb. 28, 2014 MA Agreement to acquire MOB property building sqft | Jan. 31, 2014 Texas Sale Senior living communities Five Star item
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned | 374 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings owned | 400 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which properties are located | 40 |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |
Number of buildings acquired |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 |
Number of living units |  |  |  |  | 708 | 744 |  |  |  | 36 | 112 |  |  |
Cash Paid plus Assumed Debt, excluding closing costs |  |  |  |  |  |  |  |  |  |  |  | $ 32,658 | $ 1,125,420 |
Mortgage debt assumed in connection with real estate acquisitions |  | 12,266 |  |  |  |  |  |  |  |  |  | 15,630 |  |
Area of real estate properties acquired (in square feet) |  |  |  |  |  |  |  |  |  |  |  | 125,240 | 1,651,037 |
Impairment of asset charges recorded |  | 1,304 | 721 |  | 721 |  |  |  |  |  |  |  |  |
Number of properties classified as held for sale | 13 |  | 4 | 4 | 9 | 10 | 10 | 9 |  |  |  |  |  |
Number of buildings classified as held for sale |  |  | 7 | 7 |  |  |  |  |  |  |  |  |  |
Property held for sale (in square feet) |  |  | 831,499 | 831,499 |  |  |  |  |  |  |  |  |  |
Number of properties impaired | 1 |  | 2 |  | 2 |  |  |  |  |  |  |  |  |
Real estate properties, held for sale |  |  |  |  | 25,644 | 27,888 |  |  |  |  |  |  |  |
Number of properties to be sold |  |  |  |  |  |  | 1 |  | 1 | 1 |  |  |  | 36
Sale price of property sold and agreed to be sold |  |  |  |  |  |  |  |  | 5,000 | 2,400 | 2,550 |  |  | 2,400
Gain on the sale of property | $ 156 |  |  |  |  |  |  |  |  |  |  |  |  | $ 156
Number of buildings sold |  |  |  |  |  |  |  |  | 1 |  |  |  |  |

X
- Definition Represents the area of a real estate property, held for sale. + References No definition available. + Details
Name: | snh_AreaOfRealEstatePropertyHeldForSale
Namespace Prefix: | snh_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of buildings owned as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfBuildings
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | snh_NumberOfBuildingsAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of buildings owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfBuildingsHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the number of buildings sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfBuildingsSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | snh_NumberOfPropertiesAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfPropertiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- 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
Period Type: | duration

X
- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity during the period. + References No definition available. + Details
Name: | snh_RealEstateAggregateSalesPrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_RealEstateHeldforsale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant