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COMMITMENTS AND CONTINGENCIES - Franchise and Management Agreements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Franchise agreements |  |  |  |
Commitments and contingencies |  |  |  |
Fees related to the agreement | $ 13.0 | $ 10.2 | $ 24.4 | $ 19.4
Franchise agreements | Minimum |  |  |  |
Commitments and contingencies |  |  |  |
Agreement term |  |  | 10 years |
Franchise fees received by each franchisor as a percentage of each hotel property's gross revenue |  |  | 2.00% |
Franchise agreements | Maximum |  |  |  |
Commitments and contingencies |  |  |  |
Agreement term |  |  | 20 years |
Franchise fees received by each franchisor as a percentage of each hotel property's gross revenue |  |  | 6.00% |
Marketing fees payable as a percentage of gross revenue |  |  | 4.00% |
Management agreements |  |  |  |
Commitments and contingencies |  |  |  |
Fees related to the agreement | $ 5.4 | $ 5.1 | $ 10.7 | $ 9.8
Management agreements | Minimum |  |  |  |
Commitments and contingencies |  |  |  |
Agreement term |  |  | 1 year |
Management agreements | Maximum |  |  |  |
Commitments and contingencies |  |  |  |
Agreement term |  |  | 25 years |

X
- Definition The amount of fees expensed during the reporting period related to the agreement. + References No definition available. + Details
Name: | inn_FeesExpensedRelatedToAgreement
Namespace Prefix: | inn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The franchise fees received by each franchisor as a percentage of each real estate property's gross revenue under the agreement. + References No definition available. + Details
Name: | inn_FranchiseFeesReceivedByEachFranchisorAsPercentageOfEachRealEstatePropertiesGrossRevenue
Namespace Prefix: | inn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The marketing fees payable by the entity as a percentage of gross revenue under the agreement. + References No definition available. + Details
Name: | inn_MarketingFeesPayableAsPercentageOfEachRealEstatePropertiesGrossRevenue
Namespace Prefix: | inn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period the contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | inn_TermOfContract
Namespace Prefix: | inn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=inn_FranchiseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=inn_ManagementAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |