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Commitments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies |  |  |
Operating Leases, Rent Expense | $ 6,500,000 us-gaap_LeaseAndRentalExpense | $ 5,700,000 us-gaap_LeaseAndRentalExpense | $ 5,400,000 us-gaap_LeaseAndRentalExpense
Contractual Obligation, Due in Next Twelve Months | 224,897,000 us-gaap_ContractualObligationDueInNextTwelveMonths |  |
Contractual Obligation, Due in Second Year | 147,896,000 us-gaap_ContractualObligationDueInSecondYear |  |
Contractual Obligation, Due in Third Year | 118,320,000 us-gaap_ContractualObligationDueInThirdYear |  |
Contractual Obligation, Due in Fourth Year | 128,866,000 us-gaap_ContractualObligationDueInFourthYear |  |
Contractual Obligation, Due in Fifth Year | 132,920,000 us-gaap_ContractualObligationDueInFifthYear |  |
Contractual Obligation, Due after Fifth Year | 383,619,000 us-gaap_ContractualObligationDueAfterFifthYear |  |
Contractual Obligation | 1,136,518,000 us-gaap_ContractualObligation |  |
Drilling Rig Leasing Contracts |  |  |
Commitments and Contingencies |  |  |
Long-term Purchase Commitment, Amount | 116,100,000 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = sm_DrillingRigLeasingContractsMember |  |
Early Termination Penalty For Rig Contract Cancellation | 75,800,000 sm_EarlyTerminationPenaltyForRigContractCancellation / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = sm_DrillingRigLeasingContractsMember |  |
Gas gathering through-put commitments |  |  |
Commitments and Contingencies |  |  |
Long-term Purchase Commitment, Amount | 939,400,000 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = sm_GasGatheringAndOilAndGasThroughPutCommitmentsMember |  |
Office Space Leases |  |  |
Commitments and Contingencies |  |  |
Long-term Purchase Commitment, Amount | 69,300,000 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = sm_OfficeSpaceLeasesMember |  |
Other miscellaneous contracts and leases |  |  |
Commitments and Contingencies |  |  |
Long-term Purchase Commitment, Amount | $ 11,700,000 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = sm_OtherMiscellaneousContractsAndLeasesMember |  |
Natural Gas [Member] |  |  |
Commitments and Contingencies |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | 1,411,000 us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume / us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis = us-gaap_NaturalGasReservesMember |  |
Crude Oil [Member] |  |  |
Commitments and Contingencies |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | 48,000,000 us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume / us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis = us-gaap_CrudeOilMember |  |

X
- Definition Early Termination Penalty For Rig Contract Cancellation + References No definition available. + Details
Name: | sm_EarlyTerminationPenaltyForRigContractCancellation
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total amount of product committed to be supplied under existing contracts or agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 8 -Subparagraph A + Details
Name: | us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
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Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |