Name:	svc_ManagementAgreementsAndLeasesLineItems
Namespace Prefix:	svc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the minimum returns and rents payable to the entity.

No definition available.

Name:	svc_OperatingAgreementAnnualRentAndReturn
Namespace Prefix:	svc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Operating Agreement, Increase (Decrease) In Annual Rent And Return

No definition available.

Name:	svc_OperatingAgreementIncreaseDecreaseInAnnualRentAndReturn
Namespace Prefix:	svc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Operating Agreement, Limited Guarantee

No definition available.

Name:	svc_OperatingAgreementLimitedGuarantee
Namespace Prefix:	svc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Operating Agreement, Limited Guarantee, Percentage Of Annual Minimum Returns

No definition available.

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

Property Agreement Guarantee Payment To Cover Shortfall

No definition available.

Name:	svc_PropertyAgreementGuaranteePaymentToCoverShortfall
Namespace Prefix:	svc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the amount of guarantee of performance, by a third party, under the terms of an operating agreement.

No definition available.

Name:	svc_PropertyAgreementGuaranteeReceivedByEntityAmount
Namespace Prefix:	svc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-2

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

The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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

Name:	svc_ManagementAgreementContractNameAxis=svc_RadissonAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

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