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Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended	1 Months Ended			6 Months Ended	1 Months Ended		6 Months Ended	2 Months Ended	1 Months Ended	2 Months Ended	3 Months Ended		2 Months Ended	3 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended				6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jul. 31, 2011 Acquisition sqft	Jul. 31, 2011 Acquisition Five States in the Southeast United States Senior living communities	Jun. 30, 2011 Acquisition Five States in the Southeast United States Senior living communities	Mar. 31, 2011 Acquisition Five States in the Southeast United States Senior living communities	Jun. 30, 2011 Acquisition Five States in the Southeast United States Senior living communities	May 31, 2011 Acquisition Five States in the Southeast United States Senior living communities Five Star	May 31, 2011 Acquisition Rockford, Illinois Senior living communities	Jun. 30, 2011 Acquisition Rockford, Illinois Senior living communities Five Star	Jun. 30, 2011 Acquisition Shoreview, Minnesota MOB	Jul. 31, 2011 Acquisition Alachua, Florida MOB sqft	Jun. 30, 2011 Acquisition Alachua, Florida MOB	Jul. 31, 2011 Acquisition Senior living communities	Jun. 30, 2011 Acquisition Senior living communities Five Star	Jun. 30, 2011 Acquisition MOB sqft	Jul. 31, 2011 Acquisition MOB	Jul. 31, 2011 Acquisition Living units	Jun. 30, 2011 Sale	Jun. 30, 2011 Sale	Jun. 30, 2011 Sale MOB	Jun. 30, 2011 Sale Five Star	Jun. 30, 2011 Sale Assisted living community	Jun. 30, 2011 Five Star	Jun. 30, 2011 Five Star
Real estate properties
Number of properties owned	339		339
Number of states in which properties are located	37		37					5								6			1
Number of properties agreed to be acquired								20	3							1			2
Aggregate purchase price of properties acquired, excluding closing costs					$ 22,725	$ 44,671	$ 196,594	$ 304,000			$ 7,500			$ 5,200				$ 21,750
Number of properties acquired						3	14			15	1		1	1	3			4
Mortgage loans assumed in real estate acquisition	(48,062)		(48,062)	(2,458)		12,757								3,700
Mortgage loans expected to be assumed in real estate acquisition					9,700
Number of acquisition agreements					2
Number of properties agreed to be acquired, referred as managed properties									15
Number of properties agreed to be acquired, referred as leased properties							5		5
Number of properties acquired, referred as managed properties						2	10							1
Number of real estate properties leased																	4
Number of units											73									57
Initial lease rent												608															192,915
Area of real estate properties acquired (in square feet)					45,578									32,476				174,408
Intangible lease assets recorded																		2,003
Intangible lease liabilities recorded																		251
Number of properties sold																					7		2		1
Aggregate sale price																					39,460			18,800
Gain on sale of properties	21,315		21,315																		21,315
Number of properties agreed to be sold																						0
Impairment of assets charges recorded		1,095	166	1,095
Number of properties impaired		5	2	5
Real estate improvements purchased																										4,485	15,322
Increase or decrease in annual lease rent payable																								$ (1,864)		$ 359	$ 1,228

X

- Definition

Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease.

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- Definition

The amount of debt the entity expects to assume in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition.

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Represents the number of agreements entered into by the entity to acquire senior living communities and MOBs.

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- Definition

Represents the units acquired by the borrower, funded through the mortgage loan.

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- Definition

Represents the number of properties acquired by the entity during the period, which are referred by the entity as managed properties.

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- Definition

Represents the number of properties agreed to be acquired by the entity under purchase and sales agreements during the period.

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Represents the number of properties agreed to be acquired by the entity under purchase agreements, which are referred by the entity as leased properties.

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- Definition

Represents the number of properties agreed to be acquired by the entity under purchase agreements, which are referred by the entity as managed properties.

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- Definition

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

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Namespace Prefix:	snh
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Balance Type:	na
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This element represents the number of properties sold by the entity during the period.

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- Definition

Represents the number of real estate properties impaired.

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- Definition

Represents the annual rent the lessee is obligated to pay on an operating lease.

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Namespace Prefix:	snh
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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.

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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.

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- Definition

Represents the amount of improvements to real estate properties made by lessees and purchased by the entity.

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- Definition

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

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- Definition

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

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- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- 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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-Publisher FASB
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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.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

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

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Balance Type:	na
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- Definition

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

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- Definition

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

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- Definition

The number of units (items of property) under operating lease arrangements.

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- Definition

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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Data Type:	xbrli:stringItemType
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- Definition

The amount of square footage related to a real estate property.

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration