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Construction Contracts - Additional Information (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Construction Contracts [Line Items]      
Construction contract revenue $ 23,349,000us-gaap_ConstructionRevenue $ 0us-gaap_ConstructionRevenue $ 0us-gaap_ConstructionRevenue
Construction contract costs 23,349,000us-gaap_ContractRevenueCost 0us-gaap_ContractRevenueCost 0us-gaap_ContractRevenueCost
Costs in excess of billings 0us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 11,229,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear  
Transmission Expansion Projects      
Construction Contracts [Line Items]      
Construction agreement description In the second quarter of 2013, the Company substantially completed the construction of a series of electrical transmission expansion and upgrade projects in northern Oklahoma for a third party. The Company constructed these projects for a contract price of $23.3 million, which included agreed upon change orders.    
Construction contract price 23,300,000sd_ContractPricePerAgreement
/ us-gaap_TypeOfArrangementAxis
= sd_TransmissionExpansionProjectsMember
   
Construction contract revenue 23,300,000us-gaap_ConstructionRevenue
/ us-gaap_TypeOfArrangementAxis
= sd_TransmissionExpansionProjectsMember
   
Construction contract costs 23,300,000us-gaap_ContractRevenueCost
/ us-gaap_TypeOfArrangementAxis
= sd_TransmissionExpansionProjectsMember
   
Costs in excess of billings   $ 11,200,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
/ us-gaap_TypeOfArrangementAxis
= sd_TransmissionExpansionProjectsMember