Represents the additional consideration related to allocated debt issuance costs.

No definition available.

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Weighted average interest rate on debt during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	num:percentItemType
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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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Namespace Prefix:	snh_
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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.

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No definition available.

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Represents the number of buildings owned as of the balance sheet date.

+ References

No definition available.

+ Details

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This element represents the number of buildings acquired or agreed to be acquired by the entity during the period.

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No definition available.

+ Details

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- 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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- Definition

This element represents the number of buildings sold by the entity.

+ References

No definition available.

+ Details

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- Definition

Represents the number of communities.

+ References

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Represents the number of additional properties delayed closing.

+ References

No definition available.

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Represents the number of operators or property managers.

+ References

No definition available.

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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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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

This element represents the number of properties sold or agreed to be sold by the entity.

+ References

No definition available.

+ Details

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- 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.

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- Definition

Represents the number of states in which the comapnies property is located.

+ References

No definition available.

+ Details

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- Definition

The number of units in a real estate property owned with an agreement for delayed closing as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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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

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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

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Data Type:	xbrli:monetaryItemType
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- 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
Period Type:	duration

- 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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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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
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Period Type:	instant

- Definition

Represents the intangible lease liabilities 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
Period Type:	instant

- Definition

Represents the other liabilities recorded related to real estate property acquisitions.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- 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

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Period Type:	duration

- 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.

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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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- Definition

The amount of early contract termination fees included in liabilities subject to compromise.

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-SubTopic 10

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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.

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- Definition

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

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No definition available.

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- Definition

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

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The number of units in a real estate property owned as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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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(3))

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 7

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Real Estate Properties (Details) ft² in Thousands, $ in Thousands	1 Months Ended							3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2015 USD ($) property	Jul. 31, 2015 USD ($) property item	May. 31, 2015 USD ($) state property community item	Apr. 30, 2015 USD ($) building	Feb. 28, 2015 USD ($) property	Jan. 31, 2015 USD ($) ft² state property building	Dec. 31, 2014 USD ($) community	Jun. 30, 2015 USD ($) ft² property community building item	Jun. 30, 2014 USD ($) property community building	Jun. 30, 2015 USD ($) ft² property community building item	Jun. 30, 2014 USD ($) property building	Dec. 31, 2014 USD ($) property building
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
Real estate properties, at cost							$ 6,238,611	$ 7,392,221		$ 7,392,221		$ 6,238,611
Accumulated depreciation							$ 983,850	$ 1,066,686		1,066,686		$ 983,850
Assumption of mortgage notes payable										$ 169,136	$ 15,630
Number of properties classified as held for sale \| property								3		3
Number of properties to be sold \| property					1
Gain on the sale of property									$ 2,396		$ 2,552
Triple Net Leased Net Senior Living Communities
Real Estate Properties
Number of communities \| community			18
Managed Senior Living Communities
Real Estate Properties
Number of communities \| community			5
Number of living units \| item			395
Managed Senior Living Communities \| Five Star
Real Estate Properties
Number of communities \| community			14
Number of living units \| item			838
Fees paid to terminate the agreement			$ 975
MOBs
Real Estate Properties
Number of properties classified as held for sale \| property								1	4	1	4
Number of buildings classified as held for sale \| building								4	7	4	7
Number of buildings sold \| building				4
Sale price of property sold and agreed to be sold				$ 1,500
Senior living communities
Real Estate Properties
Number of communities \| community										19
Number of living units \| item								192		192
Number of properties classified as held for sale \| property	3							3		3
Number of properties to be sold \| property		1
Real estate properties, held for sale								$ 1,280		$ 1,280
Senior living communities \| Five Star
Real Estate Properties
Number of properties acquired, referred to as managed properties			37					60	44	60
Real estate improvements purchased										$ 9,392	$ 17,423
Increase or decrease in annual lease rent payable										$ 757	$ 1,394
Senior living communities \| Five Star \| TRS
Real Estate Properties
Cash Paid plus Assumed Debt, excluding closing costs plus other settlement adjustments			$ 9,750
Acquisition
Real Estate Properties
Number of properties acquired or agreed to be acquired \| property										23
Assumption of mortgage notes payable						$ 29,955
Weighted average amortization period			11 years 9 months 18 days
Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Number of properties acquired or agreed to be acquired \| property			18
Number of living units \| item			2,119
Number of communities with delayed closing \| community			1
Number of living units with delayed closing \| item			87
Number of states in which property is located \| state			11
Cash Paid plus Assumed Debt, excluding closing costs			$ 454,026
Assumption of mortgage notes payable			$ (44,395)
Weighted average interest rate on debt (as a percent)			5.07%
Premium on Assumed Debt			$ (1,125)
Intangible lease assets recorded			53,513
Other liabilities recorded			$ (18,091)
Acquisition \| Triple Net Leased Net Senior Living Communities \| Leasing Member
Real Estate Properties
Number of operators \| item			7
Acquisition \| Managed Senior Living Communities
Real Estate Properties
Number of properties acquired or agreed to be acquired			1
Number of living units \| item			1,273
Number of states in which property is located \| state						5
Cash Paid plus Assumed Debt, excluding closing costs			$ 318,726
Assumption of mortgage notes payable			$ (94,786)
Weighted average interest rate on debt (as a percent)			4.12%
Premium on Assumed Debt			$ 832
Intangible lease assets recorded			73,044
Other liabilities recorded			$ (1,000)
Acquisition \| MOBs
Real Estate Properties
Number of properties acquired or agreed to be acquired \| property						23				23		2
Number of buildings acquired \| building						23						3
Number of states in which property is located \| state						12
Cash Paid plus Assumed Debt, excluding closing costs						$ 539,000
Additional consideration excluded from purchase price						7,377
Assumption of mortgage notes payable						$ (29,955)				$ (29,955)		$ 15,630
Weighted average interest rate on debt (as a percent)						4.73%
Area of real estate properties (in square feet) \| ft²						2,170		2,170		2,170
Cash Paid plus Assumed Debt, excluding closing costs plus other settlement adjustments						$ 531,623				$ 531,623
Premium on Assumed Debt						(1,074)				(1,074)
Intangible lease assets recorded						85,496		$ 85,496		85,496
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
Acquisition \| Senior living communities
Real Estate Properties
Number of properties acquired or agreed to be acquired			37									2
Number of living units \| item			3,352
Cash Paid plus Assumed Debt, excluding closing costs			$ 762,611
Additional consideration excluded from purchase price			1,391
Assumption of mortgage notes payable			$ 139,181
Acquisition \| Senior living communities \| Five Star
Real Estate Properties
Number of living units \| item			838
Agreement to acquire \| Managed Senior Living Communities \| TRS \| Non Leasing Member
Real Estate Properties
Number of communities \| community			19
Agreement to acquire \| Senior living communities
Real Estate Properties
Number of properties acquired or agreed to be acquired \| property		1
Number of communities \| community			37				38
Number of living units \| item		84
Cash Paid plus Assumed Debt, excluding closing costs		$ 18,250
Assumption of mortgage notes payable			$ 139,181
Weighted average interest rate on debt (as a percent)			4.43%
Sale \| Senior living communities \| Five Star
Real Estate Properties
Sale price of property sold and agreed to be sold	$ 850	155			$ 250
Increase or decrease in annual lease rent payable		$ (16)
Land \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			$ 29,395
Land \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			13,110
Land \| Acquisition \| MOBs
Real Estate Properties
Property plant and equipment recorded						$ 58,294				58,294
Buildings and improvements \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			369,445
Buildings and improvements \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			220,531
Buildings and improvements \| Acquisition \| MOBs
Real Estate Properties
Property plant and equipment recorded						$ 392,205				$ 392,205
Furniture, fixtures and equipment \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			20,889
Furniture, fixtures and equipment \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			$ 12,209
Georgia \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Number of living units \| item			40
Cash Paid plus Assumed Debt, excluding closing costs			$ 8,750
Other liabilities recorded			(1,000)
Georgia \| Land \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			975
Georgia \| Buildings and improvements \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			$ 8,775
Pennsylvania \| Senior living communities
Real Estate Properties
Sale price of property sold and agreed to be sold					$ 250
11 States \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Number of properties acquired or agreed to be acquired \| property			18
Number of living units \| item			2,119
Cash Paid plus Assumed Debt, excluding closing costs			$ 454,026
Assumption of mortgage notes payable			(44,395)
Premium on Assumed Debt			(1,125)
Intangible lease assets recorded			53,513
Other liabilities recorded			(18,091)
11 States \| Land \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			29,395
11 States \| Buildings and improvements \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			369,445
11 States \| Furniture, fixtures and equipment \| Acquisition \| Triple Net Leased Net Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			$ 20,889
5 States \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Number of properties acquired or agreed to be acquired \| property			19
Number of living units \| item			1,233
Cash Paid plus Assumed Debt, excluding closing costs			$ 309,976
Assumption of mortgage notes payable			(94,786)
Premium on Assumed Debt			832
Intangible lease assets recorded			73,044
5 States \| Land \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			12,135
5 States \| Buildings and improvements \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			211,756
5 States \| Furniture, fixtures and equipment \| Acquisition \| Managed Senior Living Communities
Real Estate Properties
Property plant and equipment recorded			$ 12,209
IOWA \| Senior living communities
Real Estate Properties
Number of properties classified as held for sale \| property		3
Sale price of property sold and agreed to be sold		$ 155
Wisconsin \| Senior living communities
Real Estate Properties
Sale price of property sold and agreed to be sold	$ 850