Number Of Real Estate Properties To Be Sold Or Rebranded

No definition available.

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

- Definition

Number Of States In Which Property Is Located

+ References

No definition available.

+ Details

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

- Definition

Real Estate Held-For-Sale, Costs

+ References

No definition available.

+ Details

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

- Definition

Real Estate Investment Property And Real Estate Held-For-Sale, At Cost

+ References

No definition available.

+ Details

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

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

Name:	us-gaap_EquitySecuritiesFvNi
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Cost of the investment.

+ References

+ Details

Name:	us-gaap_InvestmentOwnedAtCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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=120401592&loc=d3e611197-123010

+ Details

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

- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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

- 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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_HeldtomaturitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value of Assets and Liabilities - Recurring and Non-Recurring (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) ft² property hotel state shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) ft² property hotel state shares	Sep. 30, 2019 USD ($)	Mar. 12, 2020 ft² state
Fair Value of Assets and Liabilities
Aggregate undepreciated carrying value of real estate	$ 11,267,175		$ 11,267,175
Loss on asset impairment	$ 10,248	$ 0	$ 55,502	$ 0
Square Feet \| ft²	121,451		121,451
Travel Centers of America
Fair Value of Assets and Liabilities
Unrealized gain (loss) on equity securities	$ 5,606	$ (3,950)	$ 4,909	$ (43,761)
Hotels and net lease properties
Fair Value of Assets and Liabilities
Costs of real estate			$ 5,230
Square Feet \| ft²	13,682,478		13,682,478
Hotel
Fair Value of Assets and Liabilities
Number of properties owned \| hotel	329		329
Hotel \| Held-for-sale
Fair Value of Assets and Liabilities
Number of properties to be sold or rebranded \| hotel	40		40
Number of states in which property is located \| state	18		18
Aggregate undepreciated carrying value of real estate	$ 181,317		$ 181,317
Number of properties owned \| hotel	39		39
Net Lease Property
Fair Value of Assets and Liabilities
Number of properties to be sold or rebranded \| property	6		6
Number of states in which property is located \| state					2
Costs of real estate			$ 400
Square Feet \| ft²	13,700,000		13,700,000		6,696
Net Lease Property \| Held-for-sale
Fair Value of Assets and Liabilities
Aggregate undepreciated carrying value of real estate	$ 6,735		$ 6,735
Number of properties owned \| property	1		1
Square Feet \| ft²	3,000		3,000
Held-to-maturity Securities \| Hotel
Fair Value of Assets and Liabilities
Number of properties to be sold or rebranded \| hotel	1		1
Held-to-maturity Securities \| Net Lease Property
Fair Value of Assets and Liabilities
Number of properties to be sold or rebranded \| property	2		2
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Travel Centers of America
Fair Value of Assets and Liabilities
Shares included in investment securities (in shares) \| shares	1,184,797		1,184,797
Historical cost of securities	$ 24,418		$ 24,418
Recurring \| Travel Centers of America
Fair Value of Assets and Liabilities
Investment securities	23,151		23,151
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Travel Centers of America
Fair Value of Assets and Liabilities
Investment securities	23,151		23,151
Recurring \| Significant Other Observable Inputs (Level 2) \| Travel Centers of America
Fair Value of Assets and Liabilities
Investment securities	0		0
Recurring \| Significant Unobservable Inputs (Level 3) \| Travel Centers of America
Fair Value of Assets and Liabilities
Investment securities	0		0
Non-recurring \| Held-for-sale
Fair Value of Assets and Liabilities
Investment securities	$ 191,202		$ 191,202
Non-recurring \| Net Lease Property
Fair Value of Assets and Liabilities
Square Feet \| ft²	121,451		121,451
Non-recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Held-for-sale
Fair Value of Assets and Liabilities
Investment securities	$ 0		$ 0
Non-recurring \| Significant Other Observable Inputs (Level 2) \| Held-for-sale
Fair Value of Assets and Liabilities
Investment securities	191,202		191,202
Non-recurring \| Significant Unobservable Inputs (Level 3) \| Held-for-sale
Fair Value of Assets and Liabilities
Investment securities	$ 0		$ 0