2.4.0.6 Html 495 580 1 true 140 0 false 19 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.semgroupcorp.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.semgroupcorp.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.semgroupcorp.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 1002000 - Statement - Consolidated Statements of Operations and Comprehensive Income (Loss) Sheet http://www.semgroupcorp.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncomeLoss Consolidated Statements of Operations and Comprehensive Income (Loss) false false R5.htm 1003000 - Statement - Consolidated Statements of Changes in Owners' Equity Sheet http://www.semgroupcorp.com/role/ConsolidatedStatementsOfChangesInOwnersEquity Consolidated Statements of Changes in Owners' Equity false false R6.htm 1004000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.semgroupcorp.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R7.htm 2101100 - Disclosure - Overview Sheet http://www.semgroupcorp.com/role/Overview Overview false false R8.htm 2102100 - Disclosure - Consolidation And Basis Of Presentation Sheet http://www.semgroupcorp.com/role/ConsolidationAndBasisOfPresentation Consolidation And Basis Of Presentation false false R9.htm 2103100 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.semgroupcorp.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies false false R10.htm 2104100 - Disclosure - Rose Rock Midstream, L.P. Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLP Rose Rock Midstream, L.P. false false R11.htm 2105100 - Disclosure - Investments in Non-Consolidated Subsidiaries Sheet http://www.semgroupcorp.com/role/InvestmentsInNonConsolidatedSubsidiaries Investments in Non-Consolidated Subsidiaries false false R12.htm 2106100 - Disclosure - Disposals And Impairments of Long-Lived Assets Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssets Disposals And Impairments of Long-Lived Assets false false R13.htm 2107100 - Disclosure - Discontinued Operations Sheet http://www.semgroupcorp.com/role/DiscontinuedOperations Discontinued Operations false false R14.htm 2108100 - Disclosure - Segments Sheet http://www.semgroupcorp.com/role/Segments Segments false false R15.htm 2109100 - Disclosure - Inventories Sheet http://www.semgroupcorp.com/role/Inventories Inventories false false R16.htm 2110100 - Disclosure - Other Assets Sheet http://www.semgroupcorp.com/role/OtherAssets Other Assets false false R17.htm 2111100 - Disclosure - Property, Plant and Equipment Sheet http://www.semgroupcorp.com/role/PropertyPlantAndEquipment Property, Plant and Equipment false false R18.htm 2112100 - Disclosure - Goodwill and Other Intangible Assets Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets false false R19.htm 2113100 - Disclosure - Financial Instruments and Concentrations of Risk Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRisk Financial Instruments and Concentrations of Risk false false R20.htm 2114100 - Disclosure - Income Taxes Sheet http://www.semgroupcorp.com/role/IncomeTaxes Income Taxes false false R21.htm 2115100 - Disclosure - Long-Term Debt Sheet http://www.semgroupcorp.com/role/LongTermDebt Long-Term Debt false false R22.htm 2116100 - Disclosure - Commitments and Contingencies Sheet http://www.semgroupcorp.com/role/CommitmentsAndContingencies Commitments and Contingencies false false R23.htm 2117100 - Disclosure - Equity Sheet http://www.semgroupcorp.com/role/Equity Equity false false R24.htm 2118100 - Disclosure - Earnings Per Share Sheet http://www.semgroupcorp.com/role/EarningsPerShare Earnings Per Share false false R25.htm 2119100 - Disclosure - Equity-Based Compensation Sheet http://www.semgroupcorp.com/role/EquityBasedCompensation Equity-Based Compensation false false R26.htm 2120100 - Disclosure - Employee Benefit Plans Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlans Employee Benefit Plans false false R27.htm 2121100 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://www.semgroupcorp.com/role/AccumulatedOtherComprehensiveIncomeLoss Accumulated Other Comprehensive Income (Loss) false false R28.htm 2122100 - Disclosure - Supplemental Cash Flow Information Sheet http://www.semgroupcorp.com/role/SupplementalCashFlowInformation Supplemental Cash Flow Information false false R29.htm 2123100 - Disclosure - Quarterly Financial Data Sheet http://www.semgroupcorp.com/role/QuarterlyFinancialData Quarterly Financial Data false false R30.htm 2124100 - Disclosure - Related Party Transactions Sheet http://www.semgroupcorp.com/role/RelatedPartyTransactions Related Party Transactions false false R31.htm 2203201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.semgroupcorp.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) false false R32.htm 2303302 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.semgroupcorp.com/role/SummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) false false R33.htm 2304301 - Disclosure - Rose Rock Midstream, L.P. (Tables) Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLPTables Rose Rock Midstream, L.P. (Tables) false false R34.htm 2305301 - Disclosure - Investments In Non-Consolidated Subsidiaries (Tables) Sheet http://www.semgroupcorp.com/role/InvestmentsInNonConsolidatedSubsidiariesTables Investments In Non-Consolidated Subsidiaries (Tables) false false R35.htm 2306301 - Disclosure - Disposals And Impairments of Long-Lived Assets (Tables) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsTables Disposals And Impairments of Long-Lived Assets (Tables) false false R36.htm 2307301 - Disclosure - Discontinued Operations (Tables) Sheet http://www.semgroupcorp.com/role/DiscontinuedOperationsTables Discontinued Operations (Tables) false false R37.htm 2308301 - Disclosure - Segments (Tables) Sheet http://www.semgroupcorp.com/role/SegmentsTables Segments (Tables) false false R38.htm 2309301 - Disclosure - Inventories (Tables) Sheet http://www.semgroupcorp.com/role/InventoriesTables Inventories (Tables) false false R39.htm 2310301 - Disclosure - Other Assets (Tables) Sheet http://www.semgroupcorp.com/role/OtherAssetsTables Other Assets (Tables) false false R40.htm 2311301 - Disclosure - Property, Plant and Equipment (Tables) Sheet http://www.semgroupcorp.com/role/PropertyPlantAndEquipmentTables Property, Plant and Equipment (Tables) false false R41.htm 2312301 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) false false R42.htm 2313301 - Disclosure - Financial Instruments and Concentrations of Risk (Tables) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskTables Financial Instruments and Concentrations of Risk (Tables) false false R43.htm 2314301 - Disclosure - Income Taxes (Tables) Sheet http://www.semgroupcorp.com/role/IncomeTaxesTables Income Taxes (Tables) false false R44.htm 2315301 - Disclosure - Long-Term Debt (Tables) Sheet http://www.semgroupcorp.com/role/LongTermDebtTables Long-Term Debt (Tables) false false R45.htm 2316301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.semgroupcorp.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) false false R46.htm 2317301 - Disclosure - Equity (Tables) Sheet http://www.semgroupcorp.com/role/EquityTables Equity (Tables) false false R47.htm 2318301 - Disclosure - Earnings Per Share (Tables) Sheet http://www.semgroupcorp.com/role/EarningsPerShareTables Earnings Per Share (Tables) false false R48.htm 2319301 - Disclosure - Equity-Based Compensation (Tables) Sheet http://www.semgroupcorp.com/role/EquityBasedCompensationTables Equity-Based Compensation (Tables) false false R49.htm 2320301 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansTables Employee Benefit Plans (Tables) false false R50.htm 2321301 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.semgroupcorp.com/role/AccumulatedOtherComprehensiveIncomeLossTables Accumulated Other Comprehensive Income (Loss) (Tables) false false R51.htm 2322301 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://www.semgroupcorp.com/role/SupplementalCashFlowInformationTables Supplemental Cash Flow Information (Tables) false false R52.htm 2323301 - Disclosure - Quarterly Financial Data (Tables) Sheet http://www.semgroupcorp.com/role/QuarterlyFinancialDataTables Quarterly Financial Data (Tables) false false R53.htm 2324301 - Disclosure - Related Party Transactions (Tables) Sheet http://www.semgroupcorp.com/role/RelatedPartyTransactionsTables Related Party Transactions (Tables) false false R54.htm 2401401 - Disclosure - Overview (Details) Sheet http://www.semgroupcorp.com/role/OverviewDetails Overview (Details) false false R55.htm 2402401 - Disclosure - Consolidation And Basis Of Presentation (Details Textual) Sheet http://www.semgroupcorp.com/role/ConsolidationAndBasisOfPresentationDetailsTextual Consolidation And Basis Of Presentation (Details Textual) false false R56.htm 2403403 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.semgroupcorp.com/role/SummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) false false R57.htm 2403404 - Disclosure - Summary of Significant Accounting Policies (Details Textual) Sheet http://www.semgroupcorp.com/role/SummaryOfSignificantAccountingPoliciesDetailsTextual Summary of Significant Accounting Policies (Details Textual) false false R58.htm 2404402 - Disclosure - Rose Rock Midstream, L.P. (Details) Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLPDetails Rose Rock Midstream, L.P. (Details) false false R59.htm 2404403 - Disclosure - Rose Rock Midstream, L.P. (Details 1) Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLPDetails1 Rose Rock Midstream, L.P. (Details 1) false false R60.htm 2404404 - Disclosure - Rose Rock Midstream, L.P. (Details 2) Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLPDetails2 Rose Rock Midstream, L.P. (Details 2) false false R61.htm 2404405 - Disclosure - Rose Rock Midstream, L.P. (Details 3) Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLPDetails3 Rose Rock Midstream, L.P. (Details 3) false false R62.htm 2404406 - Disclosure - Rose Rock Midstream, L.P. (Details 4) Sheet http://www.semgroupcorp.com/role/RoseRockMidstreamLPDetails4 Rose Rock Midstream, L.P. (Details 4) false false R63.htm 2405402 - Disclosure - Investments In Non-Consolidated Subsidiaries (Balance Sheet Disclosure) (Details) Sheet http://www.semgroupcorp.com/role/InvestmentsInNonConsolidatedSubsidiariesBalanceSheetDisclosureDetails Investments In Non-Consolidated Subsidiaries (Balance Sheet Disclosure) (Details) false false R64.htm 2405403 - Disclosure - Investments in Non-Consolidated Subsidiaries (Income Statement Disclosure) (Details) Sheet http://www.semgroupcorp.com/role/InvestmentsInNonConsolidatedSubsidiariesIncomeStatementDisclosureDetails Investments in Non-Consolidated Subsidiaries (Income Statement Disclosure) (Details) false false R65.htm 2405404 - Disclosure - Investments in Non-Consolidated Subsidiaries (Details Textual) Sheet http://www.semgroupcorp.com/role/InvestmentsInNonConsolidatedSubsidiariesDetailsTextual Investments in Non-Consolidated Subsidiaries (Details Textual) false false R66.htm 2406402 - Disclosure - Disposals and Impairments of Long-Lived Assets (Details) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsDetails Disposals and Impairments of Long-Lived Assets (Details) false false R67.htm 2406403 - Disclosure - Disposals And Impairments of Long-Lived Assets (Details 1) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsDetails1 Disposals And Impairments of Long-Lived Assets (Details 1) false false R68.htm 2406404 - Disclosure - Disposals And Impairments of Long-Lived Assets (Details 2) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsDetails2 Disposals And Impairments of Long-Lived Assets (Details 2) false false R69.htm 2406405 - Disclosure - Disposals And Impairments of Long-Lived Assets (Details 3) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsDetails3 Disposals And Impairments of Long-Lived Assets (Details 3) false false R70.htm 2406406 - Disclosure - Disposals And Impairments of Long-Lived Assets (Details 4) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsDetails4 Disposals And Impairments of Long-Lived Assets (Details 4) false false R71.htm 2406407 - Disclosure - Disposals And Impairments of Long-Lived Assets (Details Textual) Sheet http://www.semgroupcorp.com/role/DisposalsAndImpairmentsOfLongLivedAssetsDetailsTextual Disposals And Impairments of Long-Lived Assets (Details Textual) false false R72.htm 2407402 - Disclosure - Discontinued Operations (Details) Sheet http://www.semgroupcorp.com/role/DiscontinuedOperationsDetails Discontinued Operations (Details) false false R73.htm 2408402 - Disclosure - Segments (Details) Sheet http://www.semgroupcorp.com/role/SegmentsDetails Segments (Details) false false R74.htm 2408403 - Disclosure - Segments (Details 1) Sheet http://www.semgroupcorp.com/role/SegmentsDetails1 Segments (Details 1) false false R75.htm 2409402 - Disclosure - Inventories (Details) Sheet http://www.semgroupcorp.com/role/InventoriesDetails Inventories (Details) false false R76.htm 2410402 - Disclosure - Other Assets (Details) Sheet http://www.semgroupcorp.com/role/OtherAssetsDetails Other Assets (Details) false false R77.htm 2410403 - Disclosure - Other Assets (Details 1) Sheet http://www.semgroupcorp.com/role/OtherAssetsDetails1 Other Assets (Details 1) false false R78.htm 2411402 - Disclosure - Property, Plant and Equipment (Details) Sheet http://www.semgroupcorp.com/role/PropertyPlantAndEquipmentDetails Property, Plant and Equipment (Details) false false R79.htm 2411403 - Disclosure - Property, Plant and Equipment (Details Textual) Sheet http://www.semgroupcorp.com/role/PropertyPlantAndEquipmentDetailsTextual Property, Plant and Equipment (Details Textual) false false R80.htm 2412402 - Disclosure - Goodwill and Other Intangible Assets (Details) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsDetails Goodwill and Other Intangible Assets (Details) false false R81.htm 2412403 - Disclosure - Goodwill and Other Intangible Assets (Details 1) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsDetails1 Goodwill and Other Intangible Assets (Details 1) false false R82.htm 2412404 - Disclosure - Goodwill and Other Intangible Assets (Details 2) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsDetails2 Goodwill and Other Intangible Assets (Details 2) false false R83.htm 2412405 - Disclosure - Goodwill and Other Intangible Assets (Details 3) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsDetails3 Goodwill and Other Intangible Assets (Details 3) false false R84.htm 2412406 - Disclosure - Goodwill and Other Intangible Assets (Details 4) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsDetails4 Goodwill and Other Intangible Assets (Details 4) false false R85.htm 2412407 - Disclosure - Goodwill and Other Intangible Assets (Details Textual) Sheet http://www.semgroupcorp.com/role/GoodwillAndOtherIntangibleAssetsDetailsTextual Goodwill and Other Intangible Assets (Details Textual) false false R86.htm 2413402 - Disclosure - Financial Instruments and Concentrations of Risk (Details) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetails Financial Instruments and Concentrations of Risk (Details) false false R87.htm 2413403 - Disclosure - Financial Instruments and Concentrations of Risk (Details 1) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetails1 Financial Instruments and Concentrations of Risk (Details 1) false false R88.htm 2413404 - Disclosure - Financial Instruments and Concentrations of Risk (Details 2) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetails2 Financial Instruments and Concentrations of Risk (Details 2) false false R89.htm 2413405 - Disclosure - Financial Instruments and Concentrations of Risk (Details 3) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetails3 Financial Instruments and Concentrations of Risk (Details 3) false false R90.htm 2413406 - Disclosure - Financial Instruments and Concentrations of Risk (Details 4) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetails4 Financial Instruments and Concentrations of Risk (Details 4) false false R91.htm 2413407 - Disclosure - Financial Instruments and Concentrations of Risk (Details 5) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetails5 Financial Instruments and Concentrations of Risk (Details 5) false false R92.htm 2413408 - Disclosure - Financial Instruments and Concentrations of Risk (Details Textual) Sheet http://www.semgroupcorp.com/role/FinancialInstrumentsAndConcentrationsOfRiskDetailsTextual Financial Instruments and Concentrations of Risk (Details Textual) false false R93.htm 2414402 - Disclosure - Income Taxes (Details 1) Sheet http://www.semgroupcorp.com/role/IncomeTaxesDetails1 Income Taxes (Details 1) false false R94.htm 2414403 - Disclosure - Income Taxes (Details 2) Sheet http://www.semgroupcorp.com/role/IncomeTaxesDetails2 Income Taxes (Details 2) false false R95.htm 2414404 - Disclosure - Income Taxes (Details 3) Sheet http://www.semgroupcorp.com/role/IncomeTaxesDetails3 Income Taxes (Details 3) false false R96.htm 2414405 - Disclosure - Income Taxes (Details 4) Sheet http://www.semgroupcorp.com/role/IncomeTaxesDetails4 Income Taxes (Details 4) false false R97.htm 2414406 - Disclosure - Income Taxes (Details Textual) Sheet http://www.semgroupcorp.com/role/IncomeTaxesDetailsTextual Income Taxes (Details Textual) false false R98.htm 2415402 - Disclosure - Long-Term Debt (Details) Sheet http://www.semgroupcorp.com/role/LongTermDebtDetails Long-Term Debt (Details) false false R99.htm 2415403 - Disclosure - Long-Term Debt (Details 1) Sheet http://www.semgroupcorp.com/role/LongTermDebtDetails1 Long-Term Debt (Details 1) false false R100.htm 2415404 - Disclosure - Long-Term Debt (Details Textual) Sheet http://www.semgroupcorp.com/role/LongTermDebtDetailsTextual Long-Term Debt (Details Textual) false false R101.htm 2416402 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.semgroupcorp.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) false false R102.htm 2416403 - Disclosure - Commitments and Contingencies (Details 1) Sheet http://www.semgroupcorp.com/role/CommitmentsAndContingenciesDetails1 Commitments and Contingencies (Details 1) false false R103.htm 2416404 - Disclosure - Commitments and Contingencies (Details 2) Sheet http://www.semgroupcorp.com/role/CommitmentsAndContingenciesDetails2 Commitments and Contingencies (Details 2) false false R104.htm 2416405 - Disclosure - Commitments and Contingencies (Details 3) Sheet http://www.semgroupcorp.com/role/CommitmentsAndContingenciesDetails3 Commitments and Contingencies (Details 3) false false R105.htm 2417402 - Disclosure - Equity (Details) Sheet http://www.semgroupcorp.com/role/EquityDetails Equity (Details) false false R106.htm 2417403 - Disclosure - Equity (Details 1) Sheet http://www.semgroupcorp.com/role/EquityDetails1 Equity (Details 1) false false R107.htm 2417404 - Disclosure - Equity (Details Textual) Sheet http://www.semgroupcorp.com/role/EquityDetailsTextual Equity (Details Textual) false false R108.htm 2418402 - Disclosure - Earnings Per Share (Details) Sheet http://www.semgroupcorp.com/role/EarningsPerShareDetails Earnings Per Share (Details) false false R109.htm 2418403 - Disclosure - Earnings Per Share (Details 1) Sheet http://www.semgroupcorp.com/role/EarningsPerShareDetails1 Earnings Per Share (Details 1) false false R110.htm 2418404 - Disclosure - Earnings Per Share (Details Textual) Sheet http://www.semgroupcorp.com/role/EarningsPerShareDetailsTextual Earnings Per Share (Details Textual) false false R111.htm 2419402 - Disclosure - Equity-Based Compensation (Details) Sheet http://www.semgroupcorp.com/role/EquityBasedCompensationDetails Equity-Based Compensation (Details) false false R112.htm 2419403 - Disclosure - Equity-Based Compensation (Details 1) Sheet http://www.semgroupcorp.com/role/EquityBasedCompensationDetails1 Equity-Based Compensation (Details 1) false false R113.htm 2419404 - Disclosure - Equity-Based Compensation (Details 2) Sheet http://www.semgroupcorp.com/role/EquityBasedCompensationDetails2 Equity-Based Compensation (Details 2) false false R114.htm 2419405 - Disclosure - Equity-Based Compensation (Details Textual) Sheet http://www.semgroupcorp.com/role/EquityBasedCompensationDetailsTextual Equity-Based Compensation (Details Textual) false false R115.htm 2420402 - Disclosure - Employee Benefit Plans (Details) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansDetails Employee Benefit Plans (Details) false false R116.htm 2420403 - Disclosure - Employee Benefit Plans (Details 1) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansDetails1 Employee Benefit Plans (Details 1) false false R117.htm 2420404 - Disclosure - Employee Benefit Plans (Details 2) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansDetails2 Employee Benefit Plans (Details 2) false false R118.htm 2420405 - Disclosure - Employee Benefit Plans (Details 3) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansDetails3 Employee Benefit Plans (Details 3) false false R119.htm 2420406 - Disclosure - Employee Benefit Plans (Details 4) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansDetails4 Employee Benefit Plans (Details 4) false false R120.htm 2420407 - Disclosure - Employee Benefit Plans (Details Textual) Sheet http://www.semgroupcorp.com/role/EmployeeBenefitPlansDetailsTextual Employee Benefit Plans (Details Textual) false false R121.htm 2421402 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.semgroupcorp.com/role/AccumulatedOtherComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Loss) (Details) false false R122.htm 2422402 - Disclosure - Supplemental Cash Flow Information (Details) Sheet http://www.semgroupcorp.com/role/SupplementalCashFlowInformationDetails Supplemental Cash Flow Information (Details) false false R123.htm 2422403 - Disclosure - Supplemental Cash Flow Information (Details Textual) Sheet http://www.semgroupcorp.com/role/SupplementalCashFlowInformationDetailsTextual Supplemental Cash Flow Information (Details Textual) false false R124.htm 2423402 - Disclosure - Quarterly Financial Data (Details) Sheet http://www.semgroupcorp.com/role/QuarterlyFinancialDataDetails Quarterly Financial Data (Details) false false R125.htm 2424402 - Disclosure - Related Party Transactions (Details) Sheet http://www.semgroupcorp.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) false false R126.htm 2424403 - Disclosure - Related Party Transactions (Details Textual) Sheet http://www.semgroupcorp.com/role/RelatedPartyTransactionsDetailsTextual Related Party Transactions (Details Textual) false false All Reports Book All Reports Element dei_EntityNumberOfEmployees had a mix of decimals attribute values: -1 0. Element semg_BaseFacilityInterestRate had a mix of decimals attribute values: 2 3. Element semg_DebtInstrumentApplicableMarginPercentage had a mix of decimals attribute values: 3 4. Element semg_MarginAddedToEurodollarLoans had a mix of decimals attribute values: 3 4. Element semg_OilStorageCapacityBarrels had a mix of decimals attribute values: -5 0. Element us-gaap_AllocatedShareBasedCompensationExpense had a mix of decimals attribute values: -5 -3. Element us-gaap_DefinedBenefitPlanBenefitObligation had a mix of decimals attribute values: -5 -3. Element us-gaap_DerivativeGainLossOnDerivativeNet had a mix of decimals attribute values: -5 -3. Element us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax had a mix of decimals attribute values: -5 -3. Element us-gaap_EquityMethodInvestmentOwnershipPercentage had a mix of decimals attribute values: 2 4. Element us-gaap_FiniteLivedIntangibleAssetsNet had a mix of decimals attribute values: -5 -3. Element us-gaap_InterestExpenseDebt had a mix of decimals attribute values: -5 0. Element us-gaap_LegalFees had a mix of decimals attribute values: -5 0. Element us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest had a mix of decimals attribute values: 2 3. Element us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding had a mix of decimals attribute values: -5 0. Element us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity had a mix of decimals attribute values: -6 -5 0. Element us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue had a mix of decimals attribute values: -5 -3. Element us-gaap_RevenueFromRelatedParties had a mix of decimals attribute values: -5 -3. Element us-gaap_SharePrice had a mix of decimals attribute values: 0 2. Element us-gaap_StockIssuedDuringPeriodSharesNewIssues had a mix of decimals attribute values: -5 -4. Element us-gaap_UnamortizedDebtIssuanceExpense had a mix of decimals attribute values: -5 -3. 'Monetary' elements on report '2403404 - Disclosure - Summary of Significant Accounting Policies (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '2404402 - Disclosure - Rose Rock Midstream, L.P. (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2405404 - Disclosure - Investments in Non-Consolidated Subsidiaries (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '2406402 - Disclosure - Disposals and Impairments of Long-Lived Assets (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2406407 - Disclosure - Disposals And Impairments of Long-Lived Assets (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '2413408 - Disclosure - Financial Instruments and Concentrations of Risk (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '2415402 - Disclosure - Long-Term Debt (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2419405 - Disclosure - Equity-Based Compensation (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '2420407 - Disclosure - Employee Benefit Plans (Details Textual)' had a mix of different decimal attribute values. 'Monetary' elements on report '2424403 - Disclosure - Related Party Transactions (Details Textual)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 1002000 - Statement - Consolidated Statements of Operations and Comprehensive Income (Loss) Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: 1004000 - Statement - Consolidated Statements of Cash Flows semg-20121231.xml semg-20121231.xsd semg-20121231_cal.xml semg-20121231_def.xml semg-20121231_lab.xml semg-20121231_pre.xml true true