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INVESTMENT IN HOTEL PROPERTIES UNDER DEVELOPMENT (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jan. 31, 2014
Pending hotel property acquisitions | Hampton Inn & Suites | Minneapolis, MN    
Investment in hotel properties under development    
Aggregate amount of purchase agreements $ 38.7us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= inn_CommitmentToAcquireHotelPropertyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= inn_HamptonInnAndSuitesMember
/ us-gaap_StatementGeographicalAxis
= inn_MinneapolisMinnesotaMember
 
Senior Unsecured Credit Facility    
Investment in hotel properties under development    
Line of credit 200.0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
 
Standby letters of credit | Senior Unsecured Credit Facility    
Investment in hotel properties under development    
Line of credit 13.8us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
 
Standby letters of credit | Senior Unsecured Credit Facility | Pending hotel property acquisitions    
Investment in hotel properties under development    
Line of credit   $ 13.1us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= inn_SeniorUnsecuredCreditFacilityDated10October2013Member
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= inn_CommitmentToAcquireHotelPropertyMember