XML 19 R29.htm IDEA: XBRL DOCUMENT
v2.4.0.6

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