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Compensation Plans Non Stock-based Compensation (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Cash Bonus Plan [Member] |  |  |  |
Cash Paid in Current Period for Bonus Compensation |  |  | $ 41,700,000 | $ 16,000,000
Accrued Cash Bonus Plan Expense | 6,200,000 | 5,800,000 | 19,000,000 | 16,700,000
Net Profits Plan [Member] |  |  |  |
General and administrative expense | 2,487,000 | 4,302,000 | 7,451,000 | 11,531,000
Exploration expense | 162,000 | 329,000 | 644,000 | 1,026,000
Total | $ 2,649,000 | $ 4,631,000 | $ 8,095,000 | $ 12,557,000

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

X
- Definition Represents the amount of cash paid for bonuses during the period based on previous performance. + References No definition available. + Details
Name: | sm_CashPaidInCurrentPeriodForBonusCompensation
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 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