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

No definition available.

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

- Definition

Represents the maximum percentage of equity shares of the entity, which any single person or a group can acquire without obtaining approval.

+ References

No definition available.

+ Details

Name:	svc_ShareOwnershipRestrictionsMaximumPercentageOfEquitySharesThatCanBeAcquiredWithoutApproval
Namespace Prefix:	svc_
Data Type:	dtr-types:percentItemType
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

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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

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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

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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_OwnershipAxis=svc_TravelCentersOfAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=svc_PublicStockOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- 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
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Related Person Transactions - TA Transaction Agreement (Details)	Dec. 31, 2021 property travelCenter shares	Jul. 31, 2020 $ / shares shares
Related Party Transaction [Line Items]
Number of properties \| property	1,091
TravelCenters of America LLC \| RMR LLC
Related Party Transaction [Line Items]
Number of common shares owned (in shares)	658,505
Noncontrolling interest, ownership percentage	4.40%
TravelCenters of America LLC
Related Party Transaction [Line Items]
Number of common shares owned (in shares)	1,184,797
Percentage of total shares outstanding	8.00%
Share ownership restrictions maximum percentage of equity shares that can be acquired without approval	9.80%
TravelCenters of America LLC \| Public Stock Offering
Related Party Transaction [Line Items]
Number of common shares owned (in shares)		500,797
Offering price (in dollars per share) \| $ / shares		$ 14.00
Net Lease Property
Related Party Transaction [Line Items]
Number of properties \| property	788
Net Lease Property \| TravelCenters of America Inc.
Related Party Transaction [Line Items]
Number of properties \| travelCenter	179