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Commitments (Details) $ in Millions | Sep. 30, 2018 USD ($) MMBbls Bcf | Nov. 02, 2018 USD ($)
--- | --- | ---
Water Pipeline Commitment [Member] |  |
Other Commitments [Line Items] |  |
Water delivery commitments, remaining minimum contractual volumes | MMBbls | 22 |
Water Purchase Commitment [Member] |  |
Other Commitments [Line Items] |  |
Water purchase commitment, minimum volume required | MMBbls | 7 |
Gas gathering and Oil and Gas Through-put Commitments [Member] |  |
Other Commitments [Line Items] |  |
Contractual obligation | $ 342.2 |
Drilling Rig Leasing Contracts [Member] | Subsequent Event [Member] |  |
Other Commitments [Line Items] |  |
Contractual obligation |  | $ 93.0
Early termination penalties for rig contracts |  | $ 42.7
Electricity Purchase Agreement [Member] |  |
Other Commitments [Line Items] |  |
Contractual obligation | $ 29.9 |
Crude Oil Pipeline Commitment [Member] |  |
Other Commitments [Line Items] |  |
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls | 30 |
Natural Gas Pipeline Commitment [Member] |  |
Other Commitments [Line Items] |  |
Oil and gas delivery commitments, remaining minimum contractual volumes | Bcf | 691 |

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- 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: | credit
Period Type: | instant

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- Definition Total amount of water committed to be supplied under existing contracts or agreements. + References No definition available. + Details
Name: | sm_WaterDeliveryCommitmentsandContractsRemainingContractualVolume
Namespace Prefix: | sm_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

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- 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

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- Definition Volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
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Period Type: | duration

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- Definition Total amount of product committed to be supplied under existing contracts or agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1207 -Paragraph (a) -Subparagraph (2) + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_WaterPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_PipelineCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_DrillingRigLeasingContractsMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_ElectricityPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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