Represent the amounts due from related person, owed to us from SIR related to working capital activity for MOBs.

No definition available.

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

- Definition

Number of shares delivered of equity interests owned of a related party to acquire an entity.

+ References

No definition available.

+ Details

Name:	snh_BusinessAcquisitionEquityInterestsDelivered
Namespace Prefix:	snh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortization of the difference between the carrying amount of the cost method investment and its fair value for the period.

+ References

No definition available.

+ Details

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

- Definition

Preliminary original amount of cost-method investments at the acquisition date.

+ References

No definition available.

+ Details

Name:	snh_CostMethodInvestmentsPreliminaryOriginalCost
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The precentage of interest acquired by acquiring common stock accounted under the cost method of accounting.

+ References

No definition available.

+ Details

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

- Definition

Represents the number shares acquired which have been accounted under cost method of accounting.

+ References

No definition available.

+ Details

Name:	snh_CostMethodOfInvestmentSharesAcquired
Namespace Prefix:	snh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the deferred estimated percentage rent payments received during the period.

+ References

No definition available.

+ Details

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

- Definition

Represents the percentage of direct and indirect economic interest held in RMR LLC.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount accrued for related party employee equity compensation award share grants.

+ References

No definition available.

+ Details

Name:	snh_EmployeeEquityCompensationPlanAccrual
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The ratio upon conversion of RMR Inc. class B-1 common stock into RMR Inc. class A common stock.

+ References

No definition available.

+ Details

Name:	snh_EquityInstrumentConvertibleConversionRatio
Namespace Prefix:	snh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The ratio upon conversion of RMR LLC class A membership units owned by RMR Trust into RMR Inc. class A common stock.

+ References

No definition available.

+ Details

Name:	snh_EquityInstrumentConvertibleConversionRatio1
Namespace Prefix:	snh_
Data Type:	xbrli:pureItemType
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

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

- Definition

Represents the percentage of indirect economic interest held in RMR LLC.

+ References

No definition available.

+ Details

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

- Definition

The initial other liabilities recorded which is the difference of the total consideration paid and the fair market value of the investment.

+ References

No definition available.

+ Details

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

- Definition

Represents the carrying value of a cost method investment including transaction costs.

+ References

No definition available.

+ Details

Name:	snh_InvestmentAtCarryingValueIncludingTransactionCosts
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

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

- Definition

Represents the number of the company's common shares under a lock up and registration rights agreement that are not authorized to be transfered for a specified period of time.

+ References

No definition available.

+ Details

Name:	snh_LockUpAgreementTransferOfCommonShares
Namespace Prefix:	snh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period over which the company's common shares remain under a lock up and registration rights agreement and not authorized to be transfered.

+ References

No definition available.

+ Details

Name:	snh_LockUpAgreementTransferOfCommonSharesPeriod
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	snh_NumberOfAcquiredPrivatePayIndependentLivingUnits
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of communities.

+ References

No definition available.

+ Details

Name:	snh_NumberOfCommunities
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of management agreements the company would need to terminate for convenience before a termination fee is incurred.

+ References

No definition available.

+ Details

Name:	snh_NumberOfManagementAgreemtentsTerminatedBeforeTerminationFeeIncurred
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

presents the number of management agreements RMR LLC would need to terminate for good cause before a termination fee is incurred.

+ References

No definition available.

+ Details

Name:	snh_NumberOfManagementAgreemtentsTerminatedGoodCauseBeforeTerminationFeeIncurred
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of management agreements the company would need to terminate for a performance reason before a termination fee is incurred.

+ References

No definition available.

+ Details

Name:	snh_NumberOfManagementAgreemtentsTerminatedPerformanceBeforeTerminationFeeIncurred
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	snh_NumberOfPropertiesAcquired
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

Name:	snh_NumberOfPropertiesAcquiredManagedProperties
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	snh_NumberOfPropertiesSold
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

Name:	snh_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

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

Name:	snh_NumberOfSeparateManagementAgreements
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of votes per equity interest.

+ References

No definition available.

+ Details

Name:	snh_NumberOfVotesPerEquityInterest
Namespace Prefix:	snh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- 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

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

- 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

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

- 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

Name:	snh_RealEstateAggregateSalesPrice
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the debt disposed of in sale of property transactions.

+ References

No definition available.

+ Details

Name:	snh_RealEstateDebtDisposedOfInSaleOfPropertyTransactions
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

- Definition

Represents the cash purchase price paid to acquire common shares of beneficial interest of related party pursuant to the stock purchase agreement.

+ References

No definition available.

+ Details

Name:	snh_RelatedPartyTransactionCashPurchasePrice
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

+ Details

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

- Definition

Represents the window or numbers of business days after any calendar year to provide notice for termination of property management agreement by the related party for performance reasons.

+ References

No definition available.

+ Details

Name:	snh_RelatedPartyTransactionNumberOfBusinessDayWindowAfterEndOfAnyCalendarYearPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForPerformanceByRelatedParty
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of business days notice for termination of property management agreement by the related party for convenience.

+ References

No definition available.

+ Details

Name:	snh_RelatedPartyTransactionNumberOfBusinessDaysPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForConvenienceByRelatedParty
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of business days notice for termination of property management agreement by the related party for performance, provided within a given window or numbers of days after any calendar year.

+ References

No definition available.

+ Details

Name:	snh_RelatedPartyTransactionNumberOfBusinessDaysPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForPerformanceByRelatedParty
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of base business management fees payable in cash.

+ References

No definition available.

+ Details

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

- Definition

Represents the insurance coverage of the property insurance purchased from related parties.

+ References

No definition available.

+ Details

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

- Definition

Represents the insurance coverage of the property insurance on a large property purchased from related parties.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

Name:	snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFeesPaid
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents insurance coverage for terrorism of the property insurance purchased from related parties.

+ References

No definition available.

+ Details

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

- Definition

Represents the window after a change in control to provide notice for termination of property management agreement by the related party.

+ References

No definition available.

+ Details

Name:	snh_RelatedPartyTransactionWindowAfterChangeOfControlPriorWrittenNoticeForTerminationOfPropertyManagementAgreementByRelatedParty
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents rents receivable at the balance sheet date.

+ References

No definition available.

+ Details

Name:	snh_RentsReceivable
Namespace Prefix:	snh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the period over which the discount on shares acquired is amortized in years.

+ References

No definition available.

+ Details

Name:	snh_StaightLineDiscountAmortizationPeriod
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

epresents the remaining term assumption in years used to calculate the fee for termination of one or both of the company's amended management agreements for a performance reason.

+ References

No definition available.

+ Details

Name:	snh_TerminationFeeRemainingTermAssumption
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of voting power controlled by a given entity with outstanding capital stock in RMR Inc.

+ References

No definition available.

+ Details

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

- Definition

Represents the period prior to acquisition over which weighted average trading prices are calculated.

+ References

No definition available.

+ Details

Name:	snh_WeightedAverageTradingPricePeriod
Namespace Prefix:	snh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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

- Definition

Original amount of cost-method investments at the acquisition date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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-Section S99

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-Publisher SEC

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 7

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

- Definition

The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

+ References

No definition available.

+ Details

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

- Definition

Balance held at close of period in number of shares.

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-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

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-Name Accounting Standards Codification

-Topic 946

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-Section S99

-Paragraph 1

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-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column B

-Article 12

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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

- Definition

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

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-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 55

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

+ References

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-Name Accounting Standards Codification

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Related Person Transactions (Details) $ in Thousands			1 Months Ended									3 Months Ended			6 Months Ended		12 Months Ended
Related Person Transactions (Details) $ in Thousands	Jun. 05, 2015 USD ($) agreement shares	Jan. 29, 2015 USD ($) ft² state property	Aug. 31, 2015 USD ($) property	Jul. 31, 2015 USD ($) property item	Jun. 30, 2015 USD ($) ft² property item shares	May. 31, 2015 USD ($) property agreement community item	Apr. 30, 2015 USD ($)	Feb. 28, 2015 USD ($) property shares	Jan. 31, 2015 USD ($) ft² property	Dec. 31, 2014 USD ($) community	Apr. 30, 2014 shares	Jun. 30, 2015 USD ($) ft² property Vote community item shares	Mar. 31, 2015 USD ($)	Jun. 30, 2014 USD ($) property community	Jun. 30, 2015 USD ($) ft² property community item shares	Jun. 30, 2014 USD ($) property shares	Dec. 31, 2014 USD ($) property	Dec. 31, 2001
Related person transactions
Property management and construction supervision fees paid												$ 1,494		$ 1,497	$ 3,235	$ 2,915
Related party employee equity compensation plan accrual												$ 507		359	$ 908	834
Issuance of shares (in shares) \| shares								31,050,000			15,525,000
Number of states in which properties are located \| item					43							43			43
Income (loss) recognized arising from equity investments												$ 23		118	$ 95	21
Change in net unrealized gain(loss) on investments												$ 1,387		640	$ 2,835	(1,280)
Number of properties agreed to be offered for sale \| property					3							3			3
Number of properties sold or agreed to be sold \| property								1
Interest and other income												$ 142		154	$ 217	258
RMR Trust
Related person transactions
Property management and construction supervision fees												2,532		2,079	4,969	3,718
RMR LLC
Related person transactions
Business management fees												$ 9,144		$ 7,733	$ 18,014	$ 14,415
Base business management fee payable in cash (as a percent)					100.00%							100.00%			100.00%
Rental revenue from related party													$ 51		$ 102
Senior living communities
Related person transactions
Number of living units \| item					192							192			192
Number Of Communities \| community															19
Number of properties agreed to be offered for sale \| property			3		3							3			3
Number of properties sold or agreed to be sold \| property				1
Senior living communities \| Pennsylvania
Related person transactions
Sale price of properties under agreement to be sold								$ 250
Senior living communities \| Wisconsin
Related person transactions
Sale price of properties under agreement to be sold			$ 850
MOBs
Related person transactions
Sale price of properties under agreement to be sold							$ 1,500
Number of properties agreed to be offered for sale \| property					1							1		4	1	4
Acquisition
Related person transactions
Total rental income recognized															$ 17,208
Number of properties acquired or agreed to be acquired \| property															23
Acquisition \| Senior living communities
Related person transactions
Number of living units \| item						3,352
Number of properties acquired or agreed to be acquired						37											2
Purchase price						$ 762,611
Acquisition \| MOBs
Related person transactions
Purchase price excluding closing costs and working capital adjustments									$ 531,623						$ 531,623
Number of properties acquired or agreed to be acquired \| property									23						23		2
Purchase price									$ 539,000
Area of real estate properties (in square feet) \| ft²					2,170,000				2,170,000			2,170,000			2,170,000
Acquisition \| MOBs \| SIR
Related person transactions
Amount from SIR related to working capital activity							$ 8,993
Agreement to acquire \| Senior living communities
Related person transactions
Number of living units \| item				84
Number Of Communities \| community						37				38
Number of properties acquired or agreed to be acquired \| property				1
Purchase price				$ 18,250
Five Star
Related person transactions
Percentage of total shares outstanding					8.60%							8.60%			8.60%			100.00%
Investment in common shares \| shares					4,235,000							4,235,000			4,235,000
Five Star \| Senior living communities
Related person transactions
Number of real estate properties leased \| property					180							180			180
Total rental income recognized												$ 47,753		$ 47,618	$ 95,443	$ 95,124
Deferred estimated percentage rent payments received															2,824	2,819
Real estate improvements purchased															9,392	17,423
Rents receivable					$ 15,918					$ 17,310		$ 15,918			15,918		$ 17,310
Increase or decrease in annual lease rent payable															$ 757	1,394
Number of properties acquired, referred to as managed properties						37						60		44	60
Property management agreement expense												$ 2,699		$ 2,433	$ 5,222	4,857
Number of separate management agreements entered for communities acquired \| agreement						14
Five Star \| Senior living communities \| TRS
Related person transactions
Purchase price excluding closing costs and working capital adjustments						$ 9,750
Number of private pay independent living units \| item						40
Five Star \| Acquisition \| Senior living communities
Related person transactions
Number of living units \| item						838
Five Star \| Sale \| Senior living communities
Related person transactions
Sale price of properties under agreement to be sold			850	155				250
Increase or decrease in annual lease rent payable				$ (16)
Five Star \| Sale \| Senior living communities \| Pennsylvania
Related person transactions
Minimum annual rent payable to entity								$ 23
Five Star \| Sale \| Senior living communities \| Wisconsin
Related person transactions
Minimum annual rent payable to entity			$ 85
D&R Yonkers LLC \| TRS
Related person transactions
Sublease rental												752		730	$ 1,504	1,460
RMR LLC
Related person transactions
Shares issued in connection with acquisition \| shares															81,557
SIR
Related person transactions
Debt disposed of from properties sold		$ 29,955
SIR \| Acquisition \| MOBs
Related person transactions
Purchase price excluding closing costs and working capital adjustments		$ 539,000
Number of properties acquired or agreed to be acquired \| property		23
Area of real estate properties (in square feet) \| ft²		2,170,000
Number of states in which properties are located \| state		12
AIC
Related person transactions
Equity method investments, carrying value					6,903							6,903			$ 6,903
Income (loss) recognized arising from equity investments												23		118	95	21
Change in net unrealized gain(loss) on investments												$ (64)		$ 22	$ (19)	$ 41
Coverage of purchased property insurance					500,000
Coverage of purchased property insurance for large property					1,000,000
Coverage of purchased property terror insurance					200,000
Property insurance premium					$ 4,222
Up C Transaction
Related person transactions
Indirect economic interest in RMR LLC (as a percent)	17.00%
Up C Transaction \| RMR Trust
Related person transactions
Direct and indirect economic interest in RMR LLC (as a percent)	51.60%
Voting power of outstanding capital stock of RMR Inc. (as a percent)	91.40%
Up C Transaction \| RMR LLC \| Amended Agreement
Related person transactions
Number of business days notice for termination of property management agreement for convenience by the related party	60 days
Number of business days notice for termination of property management agreement for performance by the related party	60 days
Window for providing notice of termination of property management agreement for performance by the related party	60 days
Window for providing notice of termination of property management agreement for change of control by the related party	12 months
Number of terminated management agreements for convenience before termination fee is incurred \| agreement	1
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred \| agreement	1
Number of terminated management agreements for a performance reason before termination fee is incurred \| agreement	1
Termination fee remaining term assumption	10 years
Up C Transaction \| GOV
Related person transactions
Indirect economic interest in RMR LLC (as a percent)	5.00%
Up C Transaction \| HPT
Related person transactions
Indirect economic interest in RMR LLC (as a percent)	16.20%
Up C Transaction \| SIR
Related person transactions
Indirect economic interest in RMR LLC (as a percent)	10.20%
Up C Transaction \| Managing Trustees Barry And Adam Portnoy \| RMR Trust
Related person transactions
Number of shares under lock up and registration agreement \| shares												2,345,000
Period over which shares remain under lock up and registration agreement												10 years
RMR Inc \| Up C Transaction
Related person transactions
Cash purchase price	$ 13,967
Equity conversion ratio of RMR Inc class B-1 common stock												1
Equity conversion ratio of RMR LLC class A membership units												1
Preliminary amount of investment acquired	60,739
Amount of investment acquired	$ 58,428
Percentage of interest acquired	33.00%
Fair value of investment	$ 136,278
Initial other liabilities	77,850
Investment at carrying value, including transaction costs	$ 138,839
Number of shares acquired \| shares	5,272,787
RMR Inc \| Up C Transaction \| RMR Trust
Related person transactions
Cash purchase price	$ 11,520
RMR Inc \| Up C Transaction \| RMR LLC
Related person transactions
Straight line discount amortization period	20 years
RMR Inc \| Up C Transaction \| RMR LLC \| General and administrative expense
Related person transactions
Amortization of other liabilities to reduce business and property management fees												$ 191
RMR Inc \| Up C Transaction \| RMR LLC \| Operating expense
Related person transactions
Amortization of other liabilities to reduce business and property management fees												$ 51
RMR Inc \| Up C Transaction \| GOV
Related person transactions
Cash purchase price	$ 3,917
RMR Inc \| Up C Transaction \| HPT
Related person transactions
Cash purchase price	12,622
RMR Inc \| Up C Transaction \| SIR
Related person transactions
Cash purchase price	$ 15,880
Common Shares \| RMR LLC
Related person transactions
Common shares issued as payment for base business management fee \| shares															68,983	62,060
Common Shares \| RMR Inc \| Up C Transaction
Related person transactions
Shares issued in connection with acquisition \| shares	2,345,000
Period prior to acquisition over which weighted average trading prices are calculated	20 days
Common Shares \| RMR Inc \| Up C Transaction \| GOV
Related person transactions
Shares issued in connection with acquisition \| shares	700,000
Common Shares \| RMR Inc \| Up C Transaction \| HPT
Related person transactions
Shares issued in connection with acquisition \| shares	1,490,000
Common Shares \| RMR Inc \| Up C Transaction \| SIR
Related person transactions
Shares issued in connection with acquisition \| shares	880,000
Class A common shares \| Up C Transaction \| RMR Inc
Related person transactions
Shares issued in connection with acquisition \| shares	5,272,787
Class A common shares \| Up C Transaction \| GOV \| RMR Inc
Related person transactions
Shares issued in connection with acquisition \| shares	1,541,201
Class A common shares \| Up C Transaction \| HPT \| RMR Inc
Related person transactions
Shares issued in connection with acquisition \| shares	5,019,121
Class A common shares \| Up C Transaction \| SIR \| RMR Inc
Related person transactions
Shares issued in connection with acquisition \| shares	3,166,891
Class A common shares \| RMR Inc \| Up C Transaction
Related person transactions
Number of votes per equity interest \| Vote												1
Class B1 common shares \| Up C Transaction \| RMR Inc
Related person transactions
Shares issued in connection with acquisition \| shares	1,000,000
Class B1 common shares \| RMR Inc \| RMR Trust
Related person transactions
Investment in common shares \| shares	1,000,000
Class B1 common shares \| RMR Inc \| Up C Transaction
Related person transactions
Number of votes per equity interest \| Vote												10
Class B2 common shares \| Up C Transaction \| RMR Inc
Related person transactions
Shares issued in connection with acquisition \| shares	15,000,000
Class B2 common shares \| RMR Inc \| RMR Trust
Related person transactions
Investment in common shares \| shares	15,000,000
Class B2 common shares \| RMR Inc \| Up C Transaction
Related person transactions
Number of votes per equity interest \| Vote												10
Class A member units \| RMR LLC \| RMR Trust
Related person transactions
Investment in common shares \| shares	15,000,000
Class A member units \| RMR Inc \| Up C Transaction \| RMR LLC \| RMR Trust
Related person transactions
Investment in common shares \| shares	30,000,000
Business acquisition related party equity interests delivered \| shares	15,000,000
Class B member units \| RMR Inc \| Up C Transaction \| RMR LLC
Related person transactions
Shares issued in connection with acquisition \| shares	1,000,000