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

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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