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Compensation Plans Non Stock-Based Compensation (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Bonus Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Accrued Cash Bonus Plan Expense | $ 37,800,000 sm_AccruedCashBonusPlanExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_CashBonusPlanMember | $ 41,800,000 sm_AccruedCashBonusPlanExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_CashBonusPlanMember | $ 16,300,000 sm_AccruedCashBonusPlanExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_CashBonusPlanMember
Non-qualified Deferred Compensation Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Base Salary Minimum Deferral Percentage | 0.00%sm_BaseSalaryMinimumDeferralPercentage / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Base Salary Maximum Deferral Percentage | 50.00%sm_BaseSalaryMaximumDeferralPercentage / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Cash Bonus Minimum Deferral Percentage | 0.00%sm_CashBonusMinimumDeferralPercentage / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Cash Bonus Maximum Deferral Percentage | 100.00%sm_CashBonusMaximumDeferralPercentage / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Cash Retainer Minimum Deferral Percentage | 0.00%sm_CashRetainerMinimumDeferralPercentage / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Cash Retainer Maximum Deferral Percentage | 100.00%sm_CashRetainerMaximumDeferralPercentage / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Company Percentage Contribution of Employee Deferred Amount | 100.00%sm_CompanyPercentageContributionofEmployeeDeferredAmount / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Company Percentage Contribution Limit of Employee Deferred Amount | 6.00%sm_CompanyPercentageContributionLimitofEmployeeDeferredAmount / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Employee Vesting Percentage in Company Contribution After Two Years | 40.00%sm_EmployeeVestingPercentageinCompanyContributionAfterTwoYears / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Employee Vesting Percentage in Company Contribution Year Three and Each Year Thereafter | 20.00%sm_EmployeeVestingPercentageinCompanyContributionYearThreeandEachYearThereafter / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Distribution Option Minimum Years | 1 sm_DistributionOptionMinimumYears / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Distribution Option Maximum Years | 10 sm_DistributionOptionMaximumYears / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NonqualifiedDeferredCompensationPlanMember |  |
Net Profits Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Minimum Percentage of Oil and Gas Wells, Costs Recovered for Payment to Employees from Net Profit Plan | 100.00%sm_MinimumPercentageOfOilAndGasWellsCostsRecoveredForPaymentToEmployeesFromNetProfitPlan / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember |  |
Percentage of Future Net Cash Flow Received by Participants from Net Profit Plan | 10.00%sm_PercentageOfFutureNetCashFlowReceivedByParticipantsFromNetProfitPlan / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember |  |
Percentage Of Future Net Cash Flow Received By Participants From Net Profit Plan Increased To | 20.00%sm_PercentageOfFutureNetCashFlowReceivedByParticipantsFromNetProfitPlanIncreasedTo / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember |  |
Percentage of Oil and Gas Wells Costs Recovered for Additional Payment Employees from Net Profit Plan | 200.00%sm_PercentageOfOilAndGasWellsCostsRecoveredForAdditionalPaymentEmployeesFromNetProfitPlan / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember |  |
Cash Payments Made or Accrued under Profit Sharing Plan Allocated to General and Administrative Expense | 8,326,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToGeneralAndAdministrativeExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 13,734,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToGeneralAndAdministrativeExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 15,565,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToGeneralAndAdministrativeExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember
Cash Payments Made or Accrued under Profit Sharing Plan Allocated to Oil and Gas Exploration Expense | 690,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToOilAndGasExplorationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 1,310,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToOilAndGasExplorationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 1,751,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToOilAndGasExplorationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember
Total Cash Payments, Made or Accrued under Profit Sharing Plan | 9,016,000 sm_TotalCashPaymentsMadeOrAccruedUnderProfitSharingPlan / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 15,044,000 sm_TotalCashPaymentsMadeOrAccruedUnderProfitSharingPlan / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 17,316,000 sm_TotalCashPaymentsMadeOrAccruedUnderProfitSharingPlan / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember
Cash Payments Made or Accrued under Profit Sharing Plan Related to Divested Property | 8,300,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanRelatedToDivestedProperty / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 10,300,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanRelatedToDivestedProperty / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember | 2,300,000 sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanRelatedToDivestedProperty / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = sm_NetProfitsPlanMember
401-K Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 60.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_PensionPlansDefinedBenefitMember |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_PensionPlansDefinedBenefitMember |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 6,400,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_PensionPlansDefinedBenefitMember | $ 4,200,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_PensionPlansDefinedBenefitMember | $ 3,500,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_PensionPlansDefinedBenefitMember

X
- Definition Accrued cash bonus plan expense related to the specific performance for a period which has been included within the general and administrative expense and exploration line items in the statement of operations. + References No definition available. + Details
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- Definition Base Salary Maximum Deferral Percentage + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
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Period Type: | duration

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- Definition Base Salary Minimum Deferral Percentage + References No definition available. + Details
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Namespace Prefix: | sm_
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- Definition Cash Bonus Maximum Deferral Percentage + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | duration

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- Definition Cash Bonus Minimum Deferral Percentage + References No definition available. + Details
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X
- Definition Amount expensed to general and administrative expense related to cash payments made or accrued under the profit sharing plan. + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount expensed to oil and gas exploration expense related to cash payments made or accrued under the profit sharing plan. + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Cash payments made or accrued related to profit sharing plan liabilities arising from divested properties. + References No definition available. + Details
Name: | sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanRelatedToDivestedProperty
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cash Retainer Maximum Deferral Percentage + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash Retainer Minimum Deferral Percentage + References No definition available. + Details
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Data Type: | num:percentItemType
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X
- Definition Company Percentage Contribution Limit of Employee Deferred Amount + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Company Percentage Contribution of Employee Deferred Amount + References No definition available. + Details
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Period Type: | duration

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- Definition Distribution Option Maximum Years + References No definition available. + Details
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- Definition Distribution Option Minimum Years + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Employee Vesting Percentage in Company Contribution After Two Years + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee Vesting Percentage in Company Contribution Year Three and Each Year Thereafter + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Represents the minimum percentage of total costs required to be recovered for payment of net profit plan. + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
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- Definition Represents the percentage of future net cash payment to employees from the net profit plan. + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | num:percentItemType
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- Definition Represents the percentage of future net cash payment to employees from the net profit plan. + References No definition available. + Details
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- Definition Represents the percentage of total costs required to be recovered for additional payment from the net profit plan. + References No definition available. + Details
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- Definition Total amount expensed related to cash payments made or accrued under the profit sharing plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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Data Type: | na
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- Details
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- Details
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Data Type: | na
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- Details
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