Management Agreements and Leases - Guarantees and Security Deposits Generally (Details) - Hotel - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Management Agreements and Leases [Line Items]
Amount by which the cash flow available to pay the entity's minimum rent or return was less than the minimum amount	$ 118,064	$ 42,839
Reduction of hotel operating expenses	75,927	22,465
Shortfalls due to unguaranteed portions of minimum returns	$ 47,755	$ 20,676

Represents the amount by which the cash flow available to pay the entity's minimum rent or return was less than the minimum amount contractually required.

No definition available.

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