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v3.19.3

Commitments (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Drilling Rig and Completion Service Contracts Commitments [Member] |
Commitments and Contingencies [Line Items] |
Contractual obligation | $ 57.1
Early termination penalties for rig contracts | 38.1
Electricity Purchase Agreement [Member] |
Commitments and Contingencies [Line Items] |
Contractual obligation | 55.1
Minimum [Member] | Sand Sourcing Commitment [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum sand sourcing requirements | 0.0
Minimum [Member] | Completion Service Commitment [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum completion service arrangement requirements | 0.0
Maximum [Member] | Sand Sourcing Commitment [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum sand sourcing requirements | 10.0
Maximum [Member] | Completion Service Commitment [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum completion service arrangement requirements | $ 14.3

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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 Potential Penalty for not Meeting Minimum Completion Service Arrangement Requirements + References No definition available. + Details
Name: | sm_PotentialPenaltyfornotMeetingMinimumCompletionServiceArrangementRequirements
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Potential Penalty for not Meeting Minimum Sand Sourcing Requirements + References No definition available. + Details
Name: | sm_PotentialPenaltyfornotMeetingMinimumSandSourcingRequirements
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 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
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_DrillingRigLeasingContractsMember
Namespace Prefix: |
Data Type: | na
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
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |