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Compensation Plans Non-qualified Deferred Compensation Plan (Details) (Non-qualified Deferred Compensation Plan [Member]) | 3 Months Ended
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Mar. 31, 2014 Years
Non-qualified Deferred Compensation Plan [Member] |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |
Base Salary Minimum Deferral Percentage | 0.00%
Base Salary Maximum Deferral Percentage | 50.00%
Cash Bonus Minimum Deferral Percentage | 0.00%
Cash Bonus Maximum Deferral Percentage | 100.00%
Company Percentage Contribution of Employee Deferred Amount | 100.00%
Company Percentage Contribution Limit of Employee Deferred Amount | 6.00%
Employee Vesting Percentage in Company Contribution After Two Years | 40.00%
Employee Vesting Percentage in Company Contribution Year Three and Each Year Thereafter | 20.00%
Distribution Option Minimum Years | 1
Distribution Option Maximum Years | 10

X
- Definition Base Salary Maximum Deferral Percentage + References No definition available. + Details
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- Definition Base Salary Minimum Deferral Percentage + References No definition available. + Details
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X
- Definition Cash Bonus Maximum Deferral Percentage + References No definition available. + Details
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- Definition Cash Bonus Minimum Deferral Percentage + References No definition available. + Details
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X
- Definition Company Percentage Contribution Limit of Employee Deferred Amount + References No definition available. + Details
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- Definition Company Percentage Contribution of Employee Deferred Amount + References No definition available. + Details
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- Definition Distribution Option Maximum Years + References No definition available. + Details
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- Definition Distribution Option Minimum Years + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Employee Vesting Percentage in Company Contribution After Two Years + References No definition available. + Details
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Namespace Prefix: | sm_
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Balance Type: | na
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- Definition Employee Vesting Percentage in Company Contribution Year Three and Each Year Thereafter + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Details
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