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Real Estate Properties - MOB Acquisitions Narrative (Details) $ in Thousands			1 Months Ended								12 Months Ended
	Jul. 12, 2017 USD ($) ft² building	Jan. 17, 2017 USD ($) ft² building property	Jan. 31, 2018 USD ($) ft² living_unit building	Dec. 31, 2017 USD ($) ft² building property	Nov. 30, 2017 USD ($) ft² building property	Oct. 31, 2017 USD ($) ft² building property	Oct. 31, 2016 USD ($) ft² building property	May 31, 2016 USD ($) ft² building property	Feb. 29, 2016 USD ($) ft² building property	Jan. 31, 2015 USD ($) ft² living_unit building	Dec. 31, 2017 USD ($) ft² property	Dec. 31, 2016 USD ($) ft² property	Dec. 31, 2015 USD ($) ft² property
Real Estate [Line Items]
Assumption of mortgage notes payable											$ 0	$ 0	$ 181,433
Minnesota | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property									1
Number of buildings acquired | building									3
Area of real estate properties (in square feet) | ft²									128,000
Acquired lease amortization period									6 years 4 months 24 days
Below market, acquired lease amortization period									7 years 3 months 18 days
Purchase price excluding closing costs and working capital adjustments									$ 22,700
Florida | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property								1
Number of buildings acquired | building								1
Area of real estate properties (in square feet) | ft²								166,000
Cash paid plus assumed debt								$ 45,000
Ohio | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property							1
Number of buildings acquired | building							1
Area of real estate properties (in square feet) | ft²							96,000
Acquired lease amortization period							14 years 1 month 6 days
Purchase price excluding closing costs and working capital adjustments							$ 18,500
Acquisitions | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired										23	6	3	23
Number of buildings acquired | building										23
Area of real estate properties (in square feet) | ft²				630,000						2,170,000	630,000	390,000	2,170,000
Purchase price excluding closing costs and working capital adjustments										$ 539,000
Cash paid plus assumed debt											$ 113,168	$ 86,432	$ 531,623
Assumption of mortgage notes payable										$ 29,955	$ 0	$ 0	$ 29,955
Weighted average interest rate on debt (as a percent)										4.73%
Net closing adjustments										$ 7,377
Acquisitions | MOBs | Weighted Average
Real Estate [Line Items]
Below market, acquired lease amortization period										11 years 2 months 12 days
Acquisitions | Kansas | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property		1									1
Number of buildings acquired | building		1
Area of real estate properties (in square feet) | ft²		117,000		117,000							117,000
Purchase price, including closing costs		$ 15,106
Acquisition costs incurred		$ 35
Acquired lease amortization period		10 years 3 months 18 days
Cash paid plus assumed debt											$ 15,106
Assumption of mortgage notes payable											$ 0
Acquisitions | Maryland | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property					1						1
Number of buildings acquired | building	1
Area of real estate properties (in square feet) | ft²	59,000			59,000							59,000
Purchase price, including closing costs	$ 16,601
Acquisition costs incurred	$ 383
Acquired lease amortization period	3 years 9 months 18 days
Cash paid plus assumed debt											$ 16,601
Assumption of mortgage notes payable											$ 0
Acquisitions | Minnesota and North Carolina | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property						2
Number of buildings acquired | building						2
Area of real estate properties (in square feet) | ft²						255,000
Purchase price, including closing costs						$ 38,794
Acquisition costs incurred						$ 283
Acquired lease amortization period						2 years 7 months 6 days
Acquisitions | California | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property					1						1
Number of buildings acquired | building					1
Area of real estate properties (in square feet) | ft²				63,000	63,000						63,000
Purchase price, including closing costs					$ 26,823
Acquisition costs incurred					$ 323
Acquired lease amortization period					8 years 8 months 18 days
Cash paid plus assumed debt											$ 26,823
Assumption of mortgage notes payable											$ 0
Acquisitions | Virginia | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property				1							1
Number of buildings acquired | building				1
Area of real estate properties (in square feet) | ft²				136,000							136,000
Purchase price, including closing costs				$ 15,844
Acquisition costs incurred				$ 275
Below market, acquired lease amortization period				6 years 9 months 18 days
Cash paid plus assumed debt											$ 15,844
Assumption of mortgage notes payable											$ 0
Acquisitions | Minnesota | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property												1
Area of real estate properties (in square feet) | ft²												128,000
Cash paid plus assumed debt												$ 22,700
Assumption of mortgage notes payable												$ 0
Acquisitions | Florida | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property												1
Area of real estate properties (in square feet) | ft²												166,000
Cash paid plus assumed debt												$ 45,232
Assumption of mortgage notes payable												$ 0
Acquisitions | Ohio | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | property												1
Area of real estate properties (in square feet) | ft²												96,000
Cash paid plus assumed debt												$ 18,500
Assumption of mortgage notes payable												$ 0
Above market leases | Acquisitions | MOBs | Weighted Average
Real Estate [Line Items]
Acquired lease amortization period										9 years 6 months
Above market leases | Acquisitions | Virginia | MOBs
Real Estate [Line Items]
Acquired lease amortization period				6 years 1 month 6 days
Original value lease | Acquisitions | MOBs | Weighted Average
Real Estate [Line Items]
Acquired lease amortization period										9 years 8 months 12 days
Original value lease | Acquisitions | Virginia | MOBs
Real Estate [Line Items]
Acquired lease amortization period				7 years 2 months 12 days
Subsequent Event | Acquisitions | Kansas, Missouri and California | MOBs
Real Estate [Line Items]
Number of properties acquired or agreed to be acquired | living_unit			3
Number of buildings acquired | building			3
Area of real estate properties (in square feet) | ft²			400,000
Purchase price excluding closing costs and working capital adjustments			$ 91,154

X

- Definition

Amortization period for leases with a finite life acquired as part of a real property acquisition at below market lease rate.

+ References

No definition available.

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- Definition

Represents the acquired lease amortization period.

+ References

No definition available.

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- Definition

Acquisition Costs Incurred

+ References

No definition available.

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X

- Definition

Cash Paid plus Assumed Debt, including closing costs plus other settlement adjustments

+ References

No definition available.

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X

- Definition

Represents the number of buildings acquired or agreed to be acquired by the entity.

+ References

No definition available.

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X

- Definition

Represents the number of properties acquired or agreed to be acquired by the entity.

+ References

No definition available.

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X

- Definition

Represents the aggregate purchase price excluding acquisition costs of real estate properties acquired or agreed to be acquired by the entity.

+ References

No definition available.

+ Details

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X

- Definition

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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X

- Definition

This element represents the net closing adjustments of real estate properties acquired by the entity during the period. This amount excludes closing costs.

+ References

No definition available.

+ Details

Name:	snh_RealEstateOtherClosingAdjustments
Namespace Prefix:	snh_
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Balance Type:	debit
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X

- Definition

Area of a real estate property.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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