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Related Person Transactions (Details 2) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 2 Months Ended |  |  | 12 Months Ended | 1 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 3 Months Ended | 1 Months Ended | 2 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Nov. 30, 2009 Property | Jun. 30, 2011 Property | Dec. 31, 2011 state | Dec. 31, 2011 TRS | May 31, 2011 TRS | Dec. 31, 2011 Five Star Property | Dec. 31, 2010 Five Star | Dec. 31, 2009 Five Star | Feb. 29, 2012 Five Star Senior living communities Property unit | Dec. 31, 2011 Five Star Senior living communities Property unit | Dec. 31, 2011 Five Star Rehabilitation hospitals Property | Dec. 31, 2011 Acquisition Senior living communities Property | May 31, 2011 Acquisition Senior living communities Illinois Property unit | Aug. 31, 2011 Acquisition Senior living communities Five States, Southeast Property | Jul. 31, 2011 Acquisition Senior living communities Five States, Southeast Property | Jun. 30, 2011 Acquisition Senior living communities Five States, Southeast Property | Dec. 31, 2011 Acquisition Senior living communities Six states Property | Dec. 31, 2011 Acquisition Senior living communities Six states TRS Property | Dec. 31, 2011 Acquisition Five Star Senior living communities Five States, Southeast Property | May 31, 2011 Acquisition Five Star Five Star Lease No. 1 Senior living communities Illinois | Dec. 31, 2011 Sale | Dec. 31, 2011 Sale Skilled nursing facilities Property | Dec. 31, 2010 Sale Skilled nursing facilities Property | Dec. 31, 2011 Sale Assisted living community Property | Jun. 30, 2011 Sale Assisted living community Pennsylvania Property | May 31, 2011 Sale Five Star | Jun. 30, 2011 Sale Five Star | Feb. 29, 2012 Agreement to acquire | Mar. 31, 2011 Agreement to acquire Senior living communities Five States, Southeast Property state | Jul. 31, 2011 Agreement to acquire Senior living communities Six states Property state unit | May 31, 2011 Agreement to acquire Five Star Senior living communities Five States, Southeast Property | Dec. 31, 2011 Agreement to acquire Five Star Senior living communities Five States, Southeast Property | May 31, 2011 Agreement to acquire Five Star Senior living communities Five States, Southeast TRS Property | Jan. 31, 2011 Agreement to acquire Five Star Assisted living community Pennsylvania Property unit | Nov. 30, 2010 Agreement to sell Senior living communities Georgia unit | Nov. 30, 2010 Agreement to sell Skilled nursing facilities Georgia Property | Aug. 31, 2011 Agreement to sell Five Star Assisted living community Pennsylvania Property unit
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  |  |  |  |  |  |  | 188 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  |  |  |  | $ 195,228 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 608 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rent recognized |  |  |  |  |  | 195,400 | 189,682 | 178,909 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties mortgaged |  |  |  |  |  | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  | 33,269 | 31,894 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  | 2,665 | 2,555 |  |  |  |  |  |  |  |  |  |  |  | 6,923 |  |  |  |  |  |  | (72) | (1,792) |  |  |  |  |  |  |  |  |  |
Number of properties sold or agreed to be sold | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 | 1 | 1 |  |  |  |  |  |  |  |  | 1 |  | 3 | 1
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  | 1 | 1 |  | 28 | 1 | 1 | 3 | 14 | 8 |  | 18 |  |  |  |  |  |  |  |  |  | 20 | 9 |  |  |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  | 92 | 57 |  |  | 73 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,226 |  |  |  | 70 | 329 |  | 103
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,460 |  | 1,450 |  |  |  |  |  |  |  |  |  |  | 800 | 18,000 |  |
Number of states in which properties are located |  |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 6 |  |  |  |  |  |  |
Aggregate purchase price of properties acquired, excluding closing costs |  |  |  |  |  |  |  |  | $ 11,300 | $ 11,300 |  |  | $ 7,500 | $ 17,158 | $ 44,671 | $ 196,594 | $ 379,000 |  |  |  |  |  |  |  |  |  |  | $ 144,750 | $ 304,000 | $ 478,000 |  |  |  |  |  |  |
Number of properties acquired, or agreed to be acquired, referred to as managed properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |
Investment ownership (as a percent) |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired, or agreed to be acquired, referred as leased properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 5 |  |  |  |  |  |  |  |  |  |  |  | 5 | 2 |  |  |  |  |
Increase or decrease in annual lease rent payable (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00%

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 percentage of increase or decrease in the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_IncreaseDecreaseOperatingLeasesAnnualRentPercentage
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of common stock held in the investee. + References No definition available. + Details
Name: | snh_InvestmentOwnershipPercentage
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 Represents the number of properties acquired or agreed to be acquired by the entity under purchase agreements, which are referred by the entity as leased properties. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquiredLeasedProperties
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | snh_NumberOfPropertiesAcquiredManagedProperties
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 serving as collateral for debt as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesCollateralized
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 19 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6453417&loc=d3e39896-112707 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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