Represents the former ownership percentage of a previously held subsidiary.

No definition available.

Name:	snh_FormerOwnershipPercentageOfSubsidiary
Namespace Prefix:	snh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the number of shares held as a percentage of the total shares outstanding at the end of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Represents the minimum percentage of common stock held in the investee above which the entity would have the option to cancel all its rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of private pay independent living units within communities acquired.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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Represents the number of agreements with a related party that is to provide management services to the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
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Represents the number of communities.

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No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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Represents the number of communities that are excluded from pooling agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
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Represents the number of communities managed by a related party.

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No definition available.

+ Details

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- Definition

Represents the number of communities sold.

+ References

No definition available.

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- Definition

Represents the number of entities to which related party provides management services.

+ References

No definition available.

+ Details

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Number of Managing Trustees of the entity also serving as managing trustee of a related party.

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No definition available.

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Represents the number of pooling agreement.

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- Definition

Number of Pre-Existing Management Agreements Terminated

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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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Data Type:	xbrli:integerItemType
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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.

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No definition available.

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Represents the number of separate management agreements entered for communities acquired, upon termination of a pre-existing combined management agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the number of units within the community that was sold during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	snh_
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- Definition

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

+ References

No definition available.

+ Details

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

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

+ References

No definition available.

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
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Represents the number of persons employed by a related party of the entity.

+ References

No definition available.

+ Details

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

- Definition

Represents the incentive fee payable to related parties under the business management agreement.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the annual return as a percentage of the entity's invested surplus used to determine the incentive fee payable to related parties.

+ References

No definition available.

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- Definition

Represents the incentive fee payable to related parties under property management agreement expressed as a percentage of the annual net operating income after the entity realizes an annual return equal to specified percentage of its invested capital.

+ References

No definition available.

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- Definition

Represents the management fees payable to related parties under property management agreement expressed as a percentage of gross revenues.

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No definition available.

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Represents the number of consecutive renewal terms of agreement that the entity has the option to renew.

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No definition available.

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Represents the number of years for which the entity has the option to renew the agreement.

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No definition available.

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- Definition

Represents the number of consecutive period during which the entity must not receive the minimum return for the property management agreement to be subject to the pooling agreement.

+ References

No definition available.

+ Details

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Represents rents receivable at the balance sheet date.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the maximum percentage of the equity shares of the entity which any single person or group can acquire without obtaining approval.

+ References

No definition available.

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Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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- Definition

Balance held at close of period in number of shares.

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

+ References

No definition available.

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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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The amount of revenue recognized for the period under subleasing arrangements.

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The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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

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No definition available.

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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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Related Person Transactions - Five Star (Details) $ in Thousands	1 Months Ended																12 Months Ended			55 Months Ended
	Dec. 31, 2015 USD ($) employee community property trustee agreement shares	Aug. 31, 2015 USD ($) item	Jul. 31, 2015 USD ($) item	May. 31, 2015 USD ($) community item	Feb. 28, 2015 USD ($) item	Dec. 31, 2014 USD ($) community	Oct. 31, 2014 USD ($) community item	Jul. 31, 2014 community	Jun. 30, 2014 USD ($) community item	Jan. 31, 2014 USD ($) item	Dec. 31, 2013 USD ($) item	Nov. 30, 2013 community	Aug. 31, 2013 USD ($) item	Oct. 31, 2012 community	Aug. 31, 2012 community	May. 31, 2011 community	Dec. 31, 2015 USD ($) employee community property period trustee agreement item shares	Dec. 31, 2014 USD ($) community	Dec. 31, 2013 USD ($) community	Dec. 31, 2015 USD ($) employee community property trustee agreement shares
Related person transactions
Payment for land parcel adjacent to a senior living community leased to Five Star					$ 490
Management fees as a percentage of gross revenues	3.00%																3.00%			3.00%
Incentive fee payable	$ 0																$ 0			$ 0
Number of employees \| employee	0																0			0
Number of agreements with RMR to provide management services \| agreement																	2
Number of Managing Trustees also serving as officer of related party \| trustee	1																1			1
Number of entities to which RMR provides management services \| item																	3
Senior Living Communities
Related person transactions
Number of communities \| community				1													19
Number of communities excluded from pooling agreements \| community				14													1
Number of properties acquired or agreed to be acquired \| community				37
Number of pre-existing management agreements terminated \| community				14
Number of living units \| item				838
Senior Living Communities \| Wisconsin
Related person transactions
Purchase price						$ 47,430
Number of properties acquired or agreed to be acquired \| community						2
Senior Living Communities \| New York
Related person transactions
Number of living units \| community	310																310			310
Senior Living Communities \| TRS \| Georgia
Related person transactions
Purchase price				$ 9,750
Number of properties acquired or agreed to be acquired \| community				1
Number of private pay independent living units \| item				40
Five Star
Related person transactions
Percentage of ownership in former subsidiary																	100.00%
Investment in common shares \| shares	4,235,000																4,235,000			4,235,000
Percentage of total shares outstanding	8.60%																8.60%			8.60%
Maximum percentage of any class of equity shares that can be acquired without approval	9.80%																9.80%			9.80%
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights	9.80%																9.80%			9.80%
Number of real estate properties leased \| community	177																177			177
Minimum annual rent receivable from Five Star	$ 191,927																$ 191,927			$ 191,927
Total rental income recognized																	196,919	$ 196,269	$ 203,724
Rents receivable	17,466					$ 17,310											17,466	17,310		17,466
Real estate improvements purchased																	21,444	25,804	27,208
Increase or decrease in annual lease rent payable	$ 1,734				39	$ 2,066					$ 2,177						$ 1,734	2,066	2,177	$ 1,734
Number of communities sold \| community																	11
Management fees as a percentage of gross revenues	3.00%																3.00%			3.00%
Number of consecutive period during which the entity must not receive the minimum return for the property management agreement to be subject to the pooling agreement																	3 years
Property management agreement expense																	$ 10,728	$ 9,765	$ 9,229
Number of properties acquired, referred to as managed properties \| community																	60
Five Star \| Skilled Nursing Facilities \| Missouri
Related person transactions
Increase or decrease in annual lease rent payable													$ (255)
Number of units within the community that was sold \| item													112
Sale price of properties under agreement to be sold													$ 2,550
Five Star \| Senior Living Communities
Related person transactions
Number of real estate properties leased \| property	10																10			10
Increase or decrease in annual lease rent payable	$ (2)																$ (2)			$ (2)
Sale price of properties under agreement to be sold	$ 21
Number of communities managed \| community																	60	46	44
Management fees as a percentage of gross revenues	3.00%																3.00%			3.00%
Incentive fee as percentage of the annual net operating income after the entity realizes an annual return equal to 8% of invested capital	35.00%																35.00%			35.00%
Annual return as a percentage of invested surplus specified as a base for determining incentive fee	8.00%																8.00%			8.00%
Number of consecutive renewal terms of agreement \| period																	2
Renewal period																	15 years
Number of combination or pooling agreements \| agreement	4																4			4
Number of properties acquired or agreed to be acquired \| property																				55
Number of separate management agreements entered for communities acquired \| agreement																	14
Number of properties acquired, referred to as managed properties \| property																	65
Five Star \| Senior Living Communities \| Texas
Related person transactions
Increase or decrease in annual lease rent payable										$ (210)
Number of units within the community that was sold \| item										36
Sale price of properties under agreement to be sold										$ 2,400
Five Star \| Senior Living Communities \| Wisconsin
Related person transactions
Increase or decrease in annual lease rent payable		$ (85)							$ (452)
Number of communities sold \| community									2
Number of units within the community that was sold \| item		63							156
Sale price of properties under agreement to be sold		$ 850							$ 4,500
Five Star \| Senior Living Communities \| Virginia
Related person transactions
Increase or decrease in annual lease rent payable							$ (285)
Number of units within the community that was sold \| item							70
Sale price of properties under agreement to be sold							$ 2,850
Five Star \| Senior Living Communities \| Arizona
Related person transactions
Increase or decrease in annual lease rent payable							$ (590)
Number of communities sold \| community							2
Number of units within the community that was sold \| item							177
Sale price of properties under agreement to be sold							$ 5,900
Five Star \| Senior Living Communities \| Pennsylvania
Related person transactions
Increase or decrease in annual lease rent payable					$ (23)
Number of units within the community that was sold \| item					120
Sale price of properties under agreement to be sold					$ 250
Five Star \| Senior Living Communities \| Iowa
Related person transactions
Increase or decrease in annual lease rent payable			$ (16)
Number of units within the community that was sold \| item			12
Sale price of properties under agreement to be sold			$ 155
Five Star \| Senior Living Communities \| New York
Related person transactions
Management fees as a percentage of gross revenues	5.00%																5.00%			5.00%
Incentive fee payable	$ 0																$ 0			$ 0
Five Star \| Rehabilitation Hospitals
Related person transactions
Increase or decrease in annual lease rent payable											$ (9,500)								$ (9,500)
Number of communities sold \| item											2
Sale price of properties under agreement to be sold											$ 90,000
D&R Yonkers LLC \| Senior Living Communities \| New York
Related person transactions
Number of consecutive renewal terms of agreement \| period																	9
Renewal period																	5 years
Minimum annual rent payable to entity																	$ 3,098
Sublease rent revenue																	$ 3,038	$ 2,949	$ 2,863
First AL Pooling Agreement \| Five Star \| Senior Living Communities
Related person transactions
Number of communities \| community																20
Second AL Pooling Agreement \| Five Star
Related person transactions
Number of communities \| community								19
Second AL Pooling Agreement \| Five Star \| Senior Living Communities
Related person transactions
Number of communities \| community														19
Third AL Pooling Agreement \| Five Star \| Senior Living Communities
Related person transactions
Number of communities \| community												3
IL Pooling Agreement \| Five Star \| Senior Living Communities
Related person transactions
Number of communities \| community															2