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Related Person Transactions - Management Fees and Reimbursements (Details) - USD ($) $ in Thousands	3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	May 31, 2016	Jun. 30, 2016	Jun. 30, 2015
Related person transactions
Property management and construction supervision fees	$ 2,686	$ 2,532		$ 5,232	$ 4,969
Property management and construction supervision fees paid	2,171	1,494		4,299	3,235
RMR LLC
Related person transactions
Business management fees incurred	9,243	9,144		17,590	18,014
Incentive fees payable	0	0		0	0
Common shares issued as payment for base business management fee			68,983
Accrual for RMR LLC employee share grants and internal audit costs	$ 589	$ 316		$ 1,174	$ 777

X

- Definition

Represents the expense amount accrued for employee share grants and internal audit costs to RMR LLC employees.

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No definition available.

+ Details

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

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- Definition

Represents the business management fees incurred pursuant to business management agreement with related parties.

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No definition available.

+ Details

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Namespace Prefix:	snh_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the incentive fee payable in a related party transaction.

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No definition available.

+ Details

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

X

- Definition

Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties.

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No definition available.

+ Details

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

X

- Definition

Represents the property management and construction supervision fees paid to related parties.

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No definition available.

+ Details

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Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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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No definition available.

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- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Details

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