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Commitments (Details) MMcf in Thousands, $ in Millions	Mar. 31, 2018 USD ($) MMcf MMBbls
Water Pipeline Commitment [Member]
Other Commitments [Line Items]
Water delivery commitments, remaining minimum contractual volumes | MMBbls	23
Water Purchase Commitment [Member]
Other Commitments [Line Items]
Water purchase commitment, minimum volume required | MMBbls	10
Gas gathering and Oil and Gas Through-put Commitments [Member]
Other Commitments [Line Items]
Contractual obligation	$ 461.5
Drilling Rig Leasing Contracts [Member]
Other Commitments [Line Items]
Contractual obligation	158.3
Early termination penalties for rig contracts	40.6
Electricity Purchase Agreement [Member]
Other Commitments [Line Items]
Contractual obligation	$ 31.7
Crude Oil Pipeline Commitment [Member]
Other Commitments [Line Items]
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls	18
Natural Gas Pipeline Commitment [Member]
Other Commitments [Line Items]
Oil and gas delivery commitments, remaining minimum contractual volumes | MMcf	769

X

- 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:	debit
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X

- Definition

Total amount of water committed to be supplied under existing contracts or agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	sm_
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Balance Type:	na
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- Definition

Total amount of product committed to be supplied under existing contracts or agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1207
-Paragraph (a)
-Subparagraph (2)

+ Details

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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

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- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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Namespace Prefix:
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- Details

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- Details

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