Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountRemainderOfFiscalYear
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Unrecognized cost of unvested share-based compensation awards to be recognized during the second fiscal year following the latest fiscal year.

No definition available.

Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountYearOne
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Unrecognized cost of unvested share-based compensation awards to be recognized during the third fiscal year following the latest fiscal year.

No definition available.

Name:	inn_ShareBasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmountYearTwo
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.

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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901