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Supplemental Information on Oil and Natural Gas Producing Activities - Narrative (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

MMBoe

Dec. 31, 2013

MBbls

Dec. 31, 2012

MBbls

Dec. 31, 2011

Reserve Quantities [Line Items]

Percentage of proved reserves estimated by the Company

13.90%sd_PercentageProvedReservesEstimateCompany

Standardized measure of discounted future net cash flows

$ 4,087,752us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

^[1],[2]

4,017,611us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

^[1],[2]

5,840,368us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

^[1],[2]

$ 5,216,337us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves

Acquisitions of new reserves (MMBoe)

3.5us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy

Oil Reserves

Reserve Quantities [Line Items]

Change in proved reserves (in MBbls for Oil/MMcf for Natural Gas)

67,900sd_ChangeInProvedReserves
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Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

(18,687)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(13,969)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(37,394)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

37,603us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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40,570us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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89,656us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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Proved developed and undeveloped reserves, production (in MBbls for Oil/MMcf for Natural Gas)

(10,876)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(14,279)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(15,868)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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Natural Gas Reserves

Reserve Quantities [Line Items]

Change in proved reserves (in MBbls for Oil/MMcf for Natural Gas)

60,500sd_ChangeInProvedReserves
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Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

167,589us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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^[3]

(53,432)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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^[3]

(538,214)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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^[3]

Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

467,185us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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^[3]

359,918us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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^[3]

489,302us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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^[3]

Proved developed and undeveloped reserves, production (in MBbls for Oil/MMcf for Natural Gas)

(85,697)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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^[3]

(103,233)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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^[3]

(93,549)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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^[3]

Natural Gas Liquids

Reserve Quantities [Line Items]

Change in proved reserves (in MBbls for Oil/MMcf for Natural Gas)

40,900sd_ChangeInProvedReserves
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Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

11,103us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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3,717us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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15,098us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

27,500us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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18,686us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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27,259us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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Proved developed and undeveloped reserves, production (in MBbls for Oil/MMcf for Natural Gas)

(3,794)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(2,291)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(2,094)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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Gulf Properties

Reserve Quantities [Line Items]

Sale of reserves in place (MMBoe)

55.5us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy
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Tertiary

Reserve Quantities [Line Items]

Sale of reserves in place (MMBoe)

23.6us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy
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Permian Properties

Reserve Quantities [Line Items]

Proved reserves (in MMBoe)

198.9us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy
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Proved developed reserves as a percentage of total proved reserves

55.00%sd_ProvedDevelopedReservesAsPercentageOfTotalProvedReserves
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Standardized measure of discounted future net cash flows

2,500,000us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
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Mid-Continent and Permian Basin | Oil Reserves

Reserve Quantities [Line Items]

Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

(2,000)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(22,300)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Mid-Continent and Permian Basin | Natural Gas Reserves

Reserve Quantities [Line Items]

Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

489,302us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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^[3]

Mid-Continent

Reserve Quantities [Line Items]

Extensions and discoveries (in MMBoe)

119.2us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy
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Mid-Continent | Oil Reserves

Reserve Quantities [Line Items]

Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

(8,000)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Permian Properties | Oil Reserves

Reserve Quantities [Line Items]

Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

(9,000)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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[1]	Includes approximately $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013 and 2012 respectively.
[2]	Includes approximately $643.3 million, $781.6 million and $952.7 million attributable to noncontrolling interests at December 31, 2014, 2013, and 2012 respectively.
[3]	Natural gas reserves are computed at 14.65 pounds per square inch absolute and 60 degrees Fahrenheit.

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