Management Agreements and Leases - Guarantees and Security Deposits Generally (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Management Agreements and Leases [Line Items]
Security deposits replenished	$ 0	$ 2,405	$ 0	$ 8,519
Hotel
Management Agreements and Leases [Line Items]
Reduction of hotel operating expenses	$ 30,474	$ 2,404	$ 222,134	$ 21,775

Represents the amount of reduction of hotel operating expenses due to shortfalls funded by the managers of hotels under the terms of our operating agreements.

No definition available.

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