Real Estate Properties - Schedule of Major Class of Assets and Liabilities by Investments Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets of properties held for sale:
Total assets of properties held for sale	$ 75,482	$ 94,366
Liabilities of properties held for sale:
Total liabilities of properties held for sale	2,804	$ 5,329
Real Estate Dispositions
Assets of properties held for sale:
Real estate properties, net	71,143
Other assets, net	4,339
Total assets of properties held for sale	75,482
Assets Held for Sale \| Real Estate Dispositions
Liabilities of properties held for sale:
Accounts payable and other liabilities	2,804
Total liabilities of properties held for sale	2,804
Hotel
Liabilities of properties held for sale:
Working capital included in other assets, net	1,151
Hotel \| Real Estate Dispositions
Assets of properties held for sale:
Real estate properties, net	57,944
Other assets, net	4,275
Total assets of properties held for sale	62,219
Hotel \| Assets Held for Sale \| Real Estate Dispositions
Liabilities of properties held for sale:
Accounts payable and other liabilities	2,770
Total liabilities of properties held for sale	2,770
Net Lease \| Real Estate Dispositions
Assets of properties held for sale:
Real estate properties, net	13,199
Other assets, net	64
Total assets of properties held for sale	13,263
Net Lease \| Assets Held for Sale \| Real Estate Dispositions
Liabilities of properties held for sale:
Accounts payable and other liabilities	34
Total liabilities of properties held for sale	$ 34

Asset, Held-For-Sale, Not Part Of Disposal Group, Other, Working Capital

No definition available.

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

- Definition

Asset, Held-for-Sale, Not Part of Disposal Group, Real Estate Properties, Net

+ References

No definition available.

+ Details

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

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482309/360-10-15-4

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of other assets held-for-sale that are not part of a disposal group.

+ References

+ Details

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

- Definition

Amount classified as accounts payable and accrued liabilities attributable to disposal group held for sale or disposed of.

+ References

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount classified as liabilities attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 10
-SubTopic 20
-Topic 205
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-10

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5C
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5C

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483475/205-20-45-11

+ Details

Name:	us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=svc_RealEstateDispositionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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