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Equity-Based Compensation (Details 3) (Restricted Stock Awards, USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended 0 Months Ended
May 28, 2014
Mar. 02, 2013
Sep. 30, 2014
Jun. 19, 2014
Dec. 31, 2013
Time-Based
         
Equity-based compensation          
Vesting period 3 years 3 years      
Number of Shares          
Non-vested at the beginning of period (in shares)     161,587us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Granted (in shares) 116,981us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
106,518us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
116,981us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Vested (in shares)     49,665us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Forfeited (in shares)     1,756us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Non-vested at the end of period (in shares)     227,147us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Weighted Average Grant Date Fair Value          
Non-vested at the beginning of period (in dollars per share)     $ 9.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Granted (in dollars per share)     $ 9.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Vested (in dollars per share)     $ 9.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Forfeited (in dollars per share)     $ 9.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Non-vested at the end of period (in dollars per share)     $ 9.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
   
Aggregate Current Value          
Non-vested at the end of period     $ 2,449inn_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateCurrentValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
  $ 1,454inn_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateCurrentValueNonvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
Time-Based | Severance and release agreement | Mr. Becker
         
Number of Shares          
Vested (in shares)       23,035us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= inn_StuartJBeckerMember
/ us-gaap_TypeOfArrangementAxis
= inn_SeveranceAndReleaseAgreementMember
/ inn_VestingCriteriaAxis
= inn_VestingBasedOnServiceMember
 
Time-based awards vesting period, one
         
Equity-based compensation          
Vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_ShareBasedCompensationAwardVestingBasedOnServiceTrancheOneMember
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_ShareBasedCompensationAwardVestingBasedOnServiceTrancheOneMember
     
Time-based awards vesting period, two
         
Equity-based compensation          
Vesting percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_ShareBasedCompensationAwardVestingBasedOnServiceTrancheTwoMember
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_ShareBasedCompensationAwardVestingBasedOnServiceTrancheTwoMember
     
Time-based awards vesting period, three
         
Equity-based compensation          
Vesting percentage 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_ShareBasedCompensationAwardVestingBasedOnServiceTrancheThreeMember
50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ inn_VestingCriteriaAxis
= inn_ShareBasedCompensationAwardVestingBasedOnServiceTrancheThreeMember