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v3.21.2

Commitments (Details) $ in Millions | Jun. 30, 2021 USD ($)
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Drilling Rig Leasing Contracts [Member] |
Commitments and Contingencies [Line Items] |
Early Termination Penalty for Rig Contract Cancellation | $ 9.7
Contractual Obligation | 16.1
Operating Lease |
Commitments and Contingencies [Line Items] |
Contractual Obligation | 26.1
Minimum [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum drilling and completion requirements | 0.0
Maximum [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum drilling and completion requirements | $ 45.1

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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 Drilling and Completion Requirements + References No definition available. + Details
Name: | sm_PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements
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
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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