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Compensation Plans Net Profits Plan (Details) (Net Profits Plan [Member], USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Profits Plan [Member] |  |  |  |
Costs recovered for payment to employees from net profit plan | 100.00% |  |  |
Percentage of future net cash flow received by participants from net profit plan | 10.00% |  |  |
Percentage Of future net cash flow received by participants from net profit plan increased yo | 20.00% |  |  |
Additional payment employees from net profit plan | 200.00% |  |  |
General and administrative expense | $ 13,734,000 | $ 15,565,000 |  | $ 19,326,000
Exploration expense | 1,310,000 | 1,751,000 |  | 2,091,000
Total | 15,044,000 | 17,316,000 |  | 21,417,000
Amount of cash payments related to divested properties | $ 10,300,000 | $ 2,300,000 | $ 6,300,000 |

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
Name: | sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToGeneralAndAdministrativeExpense
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
Name: | sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanAllocatedToOilAndGasExplorationExpense
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition Represents the minimum percentage of total costs required to be recovered for payment of net profit plan. + References No definition available. + Details
Name: | sm_MinimumPercentageOfOilAndGasWellsCostsRecoveredForPaymentToEmployeesFromNetProfitPlan
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of future net cash payment to employees from the net profit plan. + References No definition available. + Details
Name: | sm_PercentageOfFutureNetCashFlowReceivedByParticipantsFromNetProfitPlan
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of future net cash payment to employees from the net profit plan. + References No definition available. + Details
Name: | sm_PercentageOfFutureNetCashFlowReceivedByParticipantsFromNetProfitPlanIncreasedTo
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of total costs required to be recovered for additional payment from the net profit plan. + References No definition available. + Details
Name: | sm_PercentageOfOilAndGasWellsCostsRecoveredForAdditionalPaymentEmployeesFromNetProfitPlan
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total amount expensed related to cash payments made or accrued under the profit sharing plan. + References No definition available. + Details
Name: | sm_TotalCashPaymentsMadeOrAccruedUnderProfitSharingPlan
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration