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v3.20.2

Commitments (Details) $ in Millions | Sep. 30, 2020 USD ($)
--- | ---
Minimum [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum drilling and completion requirements | $ 0.0
Potential Penalty for not Meeting Minimum Drilling and Completion Counts | 0.0
Maximum [Member] |
Commitments and Contingencies [Line Items] |
Potential penalty for not meeting minimum drilling and completion requirements | 35.7
Potential Penalty for not Meeting Minimum Drilling and Completion Counts | 11.5
Drilling Rig Leasing Contracts [Member] |
Commitments and Contingencies [Line Items] |
Contractual Obligation | 12.2
Early Termination Penalty for Rig Contract Cancellation | $ 5.7

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: | credit
Period Type: | instant

X
- Definition Potential Penalty for not Meeting Minimum Drilling and Completion Counts + References No definition available. + Details
Name: | sm_PotentialPenaltyForNotMeetingMinimumDrillingAndCompletionCounts
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

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 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

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

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

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