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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
IRS Proposed R&D Tax Adjustment | $ 4,600,000 sm_IRSProposedRDTaxAdjustment |  |
Excess tax benefit | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |
Components of the provision for income taxes |  |  |
Federal | 0 us-gaap_CurrentFederalTaxExpenseBenefit | 0 us-gaap_CurrentFederalTaxExpenseBenefit | 0 us-gaap_CurrentFederalTaxExpenseBenefit
State | 868,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,121,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 370,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred portion of income tax expense (benefit) | 397,780,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 105,555,000 us-gaap_DeferredIncomeTaxExpenseBenefit | (29,638,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (expense) benefit | 398,648,000 us-gaap_IncomeTaxExpenseBenefit | 107,676,000 us-gaap_IncomeTaxExpenseBenefit | (29,268,000)us-gaap_IncomeTaxExpenseBenefit
Effective tax rate (as a percent) | 37.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 38.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Excess income tax benefit from the exercise of stock awards | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities |  |
Deferred Income Taxes [Abstract] |  |  |
Deferred Tax Liabilities, Oil and Gas Properties | 1,029,424,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 768,463,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Deferred Tax Liabilities, Derivative asset | 220,437,000 us-gaap_DeferredTaxLiabilitiesDerivatives | 9,529,000 us-gaap_DeferredTaxLiabilitiesDerivatives |
Deferred Tax Liabilities, Other | 4,475,000 us-gaap_DeferredTaxLiabilitiesOther | 1,245,000 us-gaap_DeferredTaxLiabilitiesOther |
Deferred Tax Liabilities | 1,254,336,000 us-gaap_DeferredIncomeTaxLiabilities | 779,237,000 us-gaap_DeferredIncomeTaxLiabilities |
Deferred Tax Assets, Federal and state tax net operating loss carryovers | 184,447,000 us-gaap_OperatingLossCarryforwards | 91,788,000 us-gaap_OperatingLossCarryforwards |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 16,763,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 18,820,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Deferred Tax Assets, Stock compensation | 126,700,000 sm_UnrecognizedTaxBenefitsExerciseOfStockAwards |  |
Deferred Tax Assets, Other Long-term Liabilities | 16,301,000 sm_DeferredTaxAssetsOtherLongTermLiabilities | 13,341,000 sm_DeferredTaxAssetsOtherLongTermLiabilities |
Deferred Tax Assets, Net Profits Plan Liability | 9,414,000 sm_DeferredTaxAssetsNetProfitsPlanLiability | 20,913,000 sm_DeferredTaxAssetsNetProfitsPlanLiability |
Deferred Tax Assets, Gross | 226,925,000 us-gaap_DeferredTaxAssetsGross | 144,862,000 us-gaap_DeferredTaxAssetsGross |
Deferred Tax Assets, Valuation Allowance | (7,246,000)us-gaap_DeferredTaxAssetsValuationAllowance | (5,001,000)us-gaap_DeferredTaxAssetsValuationAllowance |
Deferred Tax Assets, Net | 219,679,000 us-gaap_DeferredTaxAssetsNet | 139,861,000 us-gaap_DeferredTaxAssetsNet |
Deferred Tax Liabilities, Net | 1,034,657,000 us-gaap_DeferredTaxLiabilities | 639,376,000 us-gaap_DeferredTaxLiabilities |
Less: current deferred income tax liabilities | (152,082,000)us-gaap_DeferredTaxLiabilitiesGrossCurrent | (172,000)us-gaap_DeferredTaxLiabilitiesGrossCurrent |
Add: current deferred income tax assets | 9,106,000 us-gaap_DeferredTaxAssetsGrossCurrent | 10,921,000 us-gaap_DeferredTaxAssetsGrossCurrent |
Deferred income taxes; Net, non-current | 891,681,000 us-gaap_DeferredTaxLiabilitiesNoncurrent | 650,125,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 626,200,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 284,800,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 3,500,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Federal statutory tax expense (benefit) | 372,644,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 97,514,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | (29,231,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax expense (benefit) (net of federal benefit) | 21,350,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 9,400,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (992,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Research and development credit | 0 us-gaap_IncomeTaxReconciliationTaxCreditsResearch | 0 us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (970,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Change in valuation allowance | 2,245,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (314,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 1,524,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other | 2,409,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 1,076,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 401,000 us-gaap_IncomeTaxReconciliationOtherAdjustments
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Beginning Balance | 2,358,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,278,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 1,961,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits, Additions For Tax Positions Of Prior Years | 140,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 80,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 317,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | (916,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Unrecognized Tax Benefits, Ending Balance | 1,582,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,358,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,278,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Internal Revenue Service (IRS) [Member] |  |  |
Deferred Income Taxes [Abstract] |  |  |
Income Taxes Receivable, Current | 4,734,000 us-gaap_IncomeTaxesReceivable / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember | 4,630,000 us-gaap_IncomeTaxesReceivable / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
State and Local Jurisdiction [Member] |  |  |
Deferred Income Taxes [Abstract] |  |  |
Income Taxes Receivable, Current | 0 us-gaap_IncomeTaxesReceivable / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 0 us-gaap_IncomeTaxesReceivable / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Taxes Payable, Current | 25,000 us-gaap_TaxesPayableCurrent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 1,460,000 us-gaap_TaxesPayableCurrent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Minimum [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Ending Balance | 0 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 1,200,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 + Details
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