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Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended						1 Months Ended		0 Months Ended	1 Months Ended		6 Months Ended		1 Months Ended			6 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended
	Jun. 30, 2014 property state building	Jun. 30, 2013	Jun. 30, 2014 property state building	Jun. 30, 2013	Jun. 30, 2014 MOB item property sqft building	Dec. 31, 2013 MOB sqft building property	Jun. 30, 2014 Senior living communities item	Dec. 31, 2013 Senior living communities item	Aug. 31, 2013 Senior living communities Five Star property	Jun. 30, 2014 Senior living communities Five Star item	Apr. 30, 2014 Sale MOB sqft	Jun. 30, 2014 Sale MOB property building sqft	Apr. 30, 2014 Sale MOB building property sqft	Jun. 30, 2014 Sale MOB property sqft	Jun. 30, 2014 Sale Senior living communities property	Jun. 30, 2014 Sale Senior living communities Five Star property item	Jan. 31, 2014 Sale Senior living communities Five Star property item	Aug. 31, 2013 Sale Senior living communities Five Star item	Jun. 30, 2014 Acquisition MOB property sqft	Jul. 31, 2014 Acquisition Senior living communities Subsequent event property item	Jun. 30, 2014 Land Acquisition MOB	Jun. 30, 2014 Buildings and improvements Acquisition MOB	May 31, 2014 MA Acquisition MOB building property sqft	May 31, 2014 MA Land Acquisition MOB	May 31, 2014 MA Buildings and improvements Acquisition MOB	Jan. 31, 2014 Texas Sale Senior living communities Five Star item	Apr. 30, 2014 Texas Acquisition MOB building property sqft	Apr. 30, 2014 Texas Land Acquisition MOB	Apr. 30, 2014 Texas Buildings and improvements Acquisition MOB
Real Estate Properties
Number of properties owned	372		372
Number of buildings owned	399		399
Number of states in which properties are located	39		39
Real Estate Properties
Number of properties acquired or agreed to be acquired			2																2	1			1				1
Number of buildings acquired																							2				1
Number of living units							552	744								156	36	112		52
Cash Paid plus Assumed Debt, excluding closing costs																			$ 1,156,963	$ 7,000			$ 1,124,031				$ 32,932
Mortgage debt assumed in connection with real estate acquisitions			15,630	12,266															15,630								15,630
Area of real estate properties acquired (in square feet)											210,879	235,079	210,879	235,079					1,776,000				1,651,037				125,240
Impairment of asset charges recorded		4,371		5,675	334
Number of properties classified as held for sale	9		9		2	4	7	10		7
Number of buildings classified as held for sale					5	7
Property held for sale (in square feet)					385,541	831,499
Number of properties impaired					3
Real estate properties, held for sale							13,249	27,888
Number of properties to be sold									1			1	1	2	3	2	1									36
Sale price of property sold and agreed to be sold											5,000	6,000				4,500	2,400	2,550								2,400
Gain on the sale of property	2,396		2,552									0	0			2,396	156
Number of buildings sold												1	1
Premium on Assumed Debt																			1,013								1,013
Intangible lease assets recorded																			249,904				245,511				4,393
Intangible lease liabilities recorded																			118,495				118,485				10
Property plant and equipment recorded																					$ 55,784	$ 970,783		$ 52,643	$ 944,362			$ 3,141	$ 26,421

X

- Definition

Represents the area of a real estate property, held for sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
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Balance Type:	na
Period Type:	instant

X

- 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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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- 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

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

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Namespace Prefix:	snh_
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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.

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Balance Type:	na
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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

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Data Type:	xbrli:integerItemType
Balance Type:	na
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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

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Namespace Prefix:	snh_
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- 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

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the intangible lease assets recorded as part of the real estate acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Represents the intangible lease liabilities recorded as part of the real estate acquisition.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Area of a real estate property.

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No definition available.

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- 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)

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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Balance Type:	debit
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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

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Balance Type:	credit
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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

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-Publisher FASB

-Name Accounting Standards Codification

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-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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_RealEstateAbstract
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Balance Type:	na
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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

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Balance Type:	debit
Period Type:	instant