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Disposals of Long-Lived Assets (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2012
Crude [Member] | White Cliffs Pipeline, LLC [Member]    
Gain (loss) on deconsolidation, pre-tax $ (6,800)us-gaap_DeconsolidationGainOrLossAmount
/ dei_LegalEntityAxis
= semg_WhiteCliffsPipelineLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= semg_CrudeMember		  
SemStream [Member] | SemStream Arizona Residential Propane Business [Member]    
Gain (loss) on disposal of discontinued operation, pre-tax   3,090us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= semg_ResidentialDivisionMember
/ us-gaap_StatementBusinessSegmentsAxis
= semg_SemStreamMember
Loss (gain) on impairment or disposal of long-lived assets, net [Member] | Crude [Member] | White Cliffs Pipeline, LLC [Member]    
Gain (loss) on deconsolidation, pre-tax   3,500us-gaap_DeconsolidationGainOrLossAmount
/ us-gaap_IncomeStatementLocationAxis
= semg_LossgainonimpairmentordisposaloflonglivedassetsnetMember
/ dei_LegalEntityAxis
= semg_WhiteCliffsPipelineLLCMember
/ us-gaap_StatementBusinessSegmentsAxis
= semg_CrudeMember
Loss (gain) on impairment or disposal of long-lived assets, net [Member] | SemStream [Member] | SemStream Arizona Residential Propane Business [Member]    
Gain (loss) on disposal of discontinued operation, pre-tax   $ 3,090us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= semg_ResidentialDivisionMember
/ us-gaap_IncomeStatementLocationAxis
= semg_LossgainonimpairmentordisposaloflonglivedassetsnetMember
/ us-gaap_StatementBusinessSegmentsAxis
= semg_SemStreamMember