Line of Credit, Additional Borrowing Capacity Without Restrictions

No definition available.

Name:	inn_LineofCreditAdditionalBorrowingCapacityWithoutRestrictions
Namespace Prefix:	inn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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+ Details

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

- Details

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

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=inn_A2018TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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- Details

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- Details

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DEBT - Term Loans (Details)		3 Months Ended	6 Months Ended
DEBT - Term Loans (Details)	Feb. 15, 2018 USD ($)	Jun. 30, 2022 USD ($) hotel	Jun. 30, 2022 USD ($) hotel	Jun. 30, 2021 USD ($)	Mar. 23, 2022 hotel	Sep. 26, 2017 USD ($)
Debt Instrument [Line Items]
Repayments of debt			$ 392,939,000	$ 327,945,000
Hotels
Debt Instrument [Line Items]
Number of hotel properties \| hotel		102	102
Hotels \| Disposed of by Sale \| Hilton Garden Inn - South San Francisco, CA
Debt Instrument [Line Items]
Number of hotel properties \| hotel					169
2018 Term Loan \| Unsecured debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 225,000,000
Additional borrowing capacity	$ 150,000,000
Debt instrument, effective interest rate		3.94%	3.94%
2018 Term Loan \| Unsecured debt \| SOFR
Debt Instrument [Line Items]
Debt basis spread on variable rate	0.10%
2018 Term Loan \| Unsecured debt \| Minimum \| SOFR
Debt Instrument [Line Items]
Debt basis spread on variable rate	0.25%
Stated interest rate	1.35%
2018 Term Loan \| Unsecured debt \| Maximum \| SOFR
Debt Instrument [Line Items]
Stated interest rate	2.15%
2017 Term Loan \| Unsecured debt
Debt Instrument [Line Items]
Debt instrument, face amount						$ 225,000,000
Repayments of debt		$ 62,000,000