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

No definition available.

Name:	svc_InvestmentOwnedPercentageOfTotalSharesOutstanding
Namespace Prefix:	svc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the service agreements entered into by the entity for availing services from other entities.

+ References

No definition available.

+ Details

Name:	svc_NumberOfServiceAgreements
Namespace Prefix:	svc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column B))
-URI http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

+ Details

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

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- 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

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

- Details

Name:	srt_OwnershipAxis=svc_SonestaInternationalHotelsCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=svc_ReitManagementAndResearchLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=svc_TravelCentersOfAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=svc_NetLeasePropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=svc_TravelCentersOfAmericaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=svc_TravelCentersOfAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=svc_ReitManagementAndResearchLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TransactionTypeAxis=svc_AmendedAndRestateBusinessManagementAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=svc_SonestaInternationalHotelsCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_HotelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Person Transactions (Details)	Mar. 31, 2022 property agreement hotel travelCenter shares	Jan. 01, 2022 hotel	Dec. 31, 2021 shares
Sonesta Int'l Hotels Corp
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage	34.00%
RMR LLC \| Travel Centers of America
Related Party Transaction [Line Items]
Shares included in investment securities (in shares)	658,505
Noncontrolling interest, ownership percentage	4.40%
Net Lease
Related Party Transaction [Line Items]
Number of properties owned \| property	786
Net Lease \| TravelCenters of America Inc.
Related Party Transaction [Line Items]
Number of properties owned \| travelCenter	179
Travel Centers of America
Related Party Transaction [Line Items]
Percentage of total shares outstanding	8.00%
Shares included in investment securities (in shares)	1,184,797		1,184,797
RMR LLC \| Amended And Restate Business Management Agreement
Related Party Transaction [Line Items]
Number of management service agreements \| agreement	2
Sonesta Int'l Hotels Corp \| Hotels
Related Party Transaction [Line Items]
Number of properties owned \| hotel	256	261