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Accounts Receivable and Accounts Payable and Accrued Expenses Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Expenses      
Capital Expenditures Incurred but Not yet Paid $ 357,200us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 217,800us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 262,800us-gaap_CapitalExpendituresIncurredButNotYetPaid
Accounts payable and accrued expenses 640,684us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 606,751us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent  
Accrued Drilling Costs      
Accounts Payable and Accrued Expenses      
Capital Expenditures Incurred but Not yet Paid 357,156us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedDrillingCostsMember		 217,820us-gaap_CapitalExpendituresIncurredButNotYetPaid
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedDrillingCostsMember		  
Revenue and Severence Taxes Payable      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses 63,779us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_RevenueAndSeverenceTaxesPayableMember		 87,852us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_RevenueAndSeverenceTaxesPayableMember		  
Accrued Lease Operating Expense      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses 34,822us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedLeaseOperatingExpenseMember		 29,296us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedLeaseOperatingExpenseMember		  
Accrued property taxes      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses 15,059us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedPropertyTaxesMember		 10,401us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedPropertyTaxesMember		  
Joint Owner Advances      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses 152us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_JointOwnerAdvancesMember		 96,636us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_JointOwnerAdvancesMember		  
Accrued Compensation Costs      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses 56,279us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedCompensationCostsMember		 71,466us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_AccruedCompensationCostsMember		  
Accrued interest      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses 40,786us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_InterestPayableMember		 40,027us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= sm_InterestPayableMember		  
Other      
Accounts Payable and Accrued Expenses      
Accounts payable and accrued expenses $ 72,651us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= us-gaap_OtherCurrentLiabilitiesMember		 $ 53,253us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ sm_AccountsPayableAndAccruedExpensesAxis
= us-gaap_OtherCurrentLiabilitiesMember