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Compensation Plans Non Stock-based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Profits Plan [Member]
General and administrative expense	$ 3,786,000	$ 4,412,000
Exploration expense	374,000	525,000
Total	4,160,000	4,937,000
Cash Bonus Plan [Member]
Cash Paid in Current Period for Bonus Compensation	16,000,000	24,000,000
Accrued Cash Bonus Plan Expense	$ 5,600,000	$ 4,700,000

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