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Fair Value Measurements - Reconciliation of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Detail) (Commodity derivative contracts, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commodity derivative contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of Level 3	$ (512)	$ (4,253)
Total realized and unrealized gains (losses)	(873)	2,032
Settlements (received) paid	1,174	(454)
Ending balance of Level 3	$ (211)	$ (2,675)

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liabilities

+ References

No definition available.

+ Details

Name:	sd_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilities
Namespace Prefix:	sd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

No definition available.

+ Details

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Namespace Prefix:	sd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	sd_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitiesSettlements
Namespace Prefix:	sd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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