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Commitments (Details) - Drilling Rig Leasing Contracts - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Apr. 27, 2023
Commitments and Contingencies [Line Items] |  |
Early Termination Penalty Incurred for Rig Contract Cancellation | $ 0.0 |
Subsequent Event |  |
Commitments and Contingencies [Line Items] |  |
Contractual Obligation |  | $ 30.3
Early Termination Penalty for Rig Contract Cancellation |  | $ 18.8

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- Definition Early Termination Penalty Incurred for Rig Contract Cancellation + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Early Termination Penalty for Rig Contract Cancellation + References No definition available. + Details
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Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |