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Rose Rock Midstream, L.P. (Details 1) (Rose Rock Midstream L P [Member])
 12 Months Ended
Dec. 31, 2014
Minimum Quarterly Distributions [Member]
  
Quarterly Target Distributions  
Marginal Percentage Interest, Unitholders 98.00%semg_MarginalPercentageInterestUnitholders
/ semg_DistributionTargetsAxis
= semg_MinimumQuarterlyDistributionsMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, General Partner 2.00%semg_MarginalPercentageInterestGeneralPartner
/ semg_DistributionTargetsAxis
= semg_MinimumQuarterlyDistributionsMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, Incentive Distribution Rights 0.00%semg_MarginalPercentageInterestIncentiveDistributionRights
/ semg_DistributionTargetsAxis
= semg_MinimumQuarterlyDistributionsMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Minimum Quarterly Distributions [Member] | Minimum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.3625semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_MinimumQuarterlyDistributionsMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
First Target Distribution [Member]
  
Quarterly Target Distributions  
Marginal Percentage Interest, Unitholders 98.00%semg_MarginalPercentageInterestUnitholders
/ semg_DistributionTargetsAxis
= semg_FirstTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, General Partner 2.00%semg_MarginalPercentageInterestGeneralPartner
/ semg_DistributionTargetsAxis
= semg_FirstTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, Incentive Distribution Rights 0.00%semg_MarginalPercentageInterestIncentiveDistributionRights
/ semg_DistributionTargetsAxis
= semg_FirstTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
First Target Distribution [Member] | Minimum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.3625semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_FirstTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
First Target Distribution [Member] | Maximum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.416875semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_FirstTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Second Target Distribution [Member]
  
Quarterly Target Distributions  
Marginal Percentage Interest, Unitholders 85.00%semg_MarginalPercentageInterestUnitholders
/ semg_DistributionTargetsAxis
= semg_SecondTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, General Partner 2.00%semg_MarginalPercentageInterestGeneralPartner
/ semg_DistributionTargetsAxis
= semg_SecondTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, Incentive Distribution Rights 13.00%semg_MarginalPercentageInterestIncentiveDistributionRights
/ semg_DistributionTargetsAxis
= semg_SecondTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Second Target Distribution [Member] | Minimum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.416875semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_SecondTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Second Target Distribution [Member] | Maximum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.453125semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_SecondTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Third Target Distribution [Member]
  
Quarterly Target Distributions  
Marginal Percentage Interest, Unitholders 75.00%semg_MarginalPercentageInterestUnitholders
/ semg_DistributionTargetsAxis
= semg_ThirdTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, General Partner 2.00%semg_MarginalPercentageInterestGeneralPartner
/ semg_DistributionTargetsAxis
= semg_ThirdTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, Incentive Distribution Rights 23.00%semg_MarginalPercentageInterestIncentiveDistributionRights
/ semg_DistributionTargetsAxis
= semg_ThirdTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Third Target Distribution [Member] | Minimum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.453125semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_ThirdTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Third Target Distribution [Member] | Maximum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.54375semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_ThirdTargetDistributionMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Thereafter [Member]
  
Quarterly Target Distributions  
Marginal Percentage Interest, Unitholders 50.00%semg_MarginalPercentageInterestUnitholders
/ semg_DistributionTargetsAxis
= semg_ThereafterMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, General Partner 2.00%semg_MarginalPercentageInterestGeneralPartner
/ semg_DistributionTargetsAxis
= semg_ThereafterMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Marginal Percentage Interest, Incentive Distribution Rights 48.00%semg_MarginalPercentageInterestIncentiveDistributionRights
/ semg_DistributionTargetsAxis
= semg_ThereafterMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
Thereafter [Member] | Minimum [Member]
  
Quarterly Target Distributions  
Partners' minimum quarterly distribution per unit 0.54375semg_QuarterlyDistributionsPerUnitTargetAmounts
/ semg_DistributionTargetsAxis
= semg_ThereafterMember
/ dei_LegalEntityAxis
= semg_RoseRockMidstreamLPMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember