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

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

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

$ 4,017,611us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure

^[1]

$ 5,840,368us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure

^[1]

$ 5,216,337us-gaap_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure

^[1]

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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37,600sd_ChangeInProvedReserves
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Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

(13,969)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(37,394)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(6,159)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

40,570us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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89,656us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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52,406us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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Proved developed and undeveloped reserves, production (in MBbls for Oil/MMcf for Natural Gas)

(14,279)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(15,868)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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= us-gaap_OilReservesMember

(9,992)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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68,600sd_ChangeInProvedReserves
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Revisions of previous estimates (in MBbls for Oil and NGLs/MMcf for Natural Gas)

(53,432)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(538,214)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(164,845)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

359,918us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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489,302us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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299,848us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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^[2]

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

(103,233)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(93,549)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(69,306)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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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)

3,717us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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15,098us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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(3,119)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

18,686us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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27,259us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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3,171us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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Proved developed and undeveloped reserves, production (in MBbls for Oil/MMcf for Natural Gas)

(2,291)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(2,094)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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(1,838)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction
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Permian properties and east Texas properties

Reserve Quantities [Line Items]

Proved reserves, sales of minerals in place (in MMBoe)

122.7sd_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlaceBoe
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Tertiary

Reserve Quantities [Line Items]

Proved reserves, sales of minerals in place (in MMBoe)

23.6sd_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlaceBoe
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Permian Properties

Reserve Quantities [Line Items]

Proved reserves (in MMBoe)

198.9sd_ProvedDevelopedAndUndevelopedReservesNetBoe
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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_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure
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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)

(22,300)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
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Extensions and discoveries (in MBbls for Oil and NGLs/MMcf for Natural Gas)

52,406us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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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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^[2]

299,848us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions
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^[2]

Mid-Continent

Reserve Quantities [Line Items]

Extensions and discoveries (in MMBoe)

119.2sd_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditionsBoe
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[1]	Includes approximately $781.6 million, $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2013, 2012 and 2011 respectively.
[2]	Natural gas reserves are computed at 14.65 pounds per square inch absolute and 60 degrees Fahrenheit.

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Sales of minerals In place

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