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Property, Plant and Equipment - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Cumulative full cost ceiling limitation impairment charges	$ 3,500,000,000sd_OilAndGasPropertyCumulativeImpairmentBasedOnCeilingTestCalculation	$ 3,500,000,000sd_OilAndGasPropertyCumulativeImpairmentBasedOnCeilingTestCalculation
Full cost ceiling impairments	0us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense	0us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense	0us-gaap_UnamortizedCostsCapitalizedLessRelatedDeferredIncomeTaxesExceedCeilingLimitationExpense
Average depreciation and depletion rate (per Boe)	16.81sd_AverageDepreciationAndDepletionRate	16.93sd_AverageDepreciationAndDepletionRate	13.57sd_AverageDepreciationAndDepletionRate
Proved oil and natural gas properties, cost incurred in excess of development agreement	$ 180,000,000sd_ProvedOilandNaturalGasPropertiesCostIncurredinExcessofDevelopmentAgreement	$ 180,000,000sd_ProvedOilandNaturalGasPropertiesCostIncurredinExcessofDevelopmentAgreement
Expected completion of evaluation activities on majority of unproved properties	10 years

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- Definition

Average depreciation and depletion rate on oil and gas properties.

+ References

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- Definition

Expected years to complete majority of evaluation activities on unproved properties.

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- Definition

Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation.

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- Definition

Proved Oil and Natural Gas Properties, Cost Incurred in Excess of Development Agreement

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- Definition

The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 4(ii)

-Article 4

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