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Compensation Plans Non Stock-based Compensation (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Document Period End Date | Mar. 31, 2014 |
Cash Bonus Plan [Member] |  |
Cash Paid in Current Period for Bonus Compensation | $ 41,700,000 | $ 16,000,000
Accrued Cash Bonus Plan Expense | 6,600,000 | 5,600,000
Net Profits Plan [Member] |  |
General and administrative expense | 2,978,000 | 3,786,000
Exploration expense | 288,000 | 374,000
Total | $ 3,266,000 | $ 4,160,000

X
- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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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X
- Definition Represents the amount of cash paid for bonuses during the period based on previous performance. + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
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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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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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X
- 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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Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
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