2.4.0.6 Html 177 216 1 true 54 0 false 16 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.gmxresources.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.gmxresources.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.gmxresources.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 1002000 - Statement - Consolidated Statements of Operations Sheet http://www.gmxresources.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations false false R5.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.gmxresources.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income false false R6.htm 1003501 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.gmxresources.com/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) false false R7.htm 1004000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.gmxresources.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R8.htm 2101100 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies Sheet http://www.gmxresources.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPolicies Nature of Operations and Summary of Significant Accounting Policies false false R9.htm 2104100 - Disclosure - Long-Term Debt Sheet http://www.gmxresources.com/role/LongTermDebt Long-Term Debt false false R10.htm 2107100 - Disclosure - Derivative Activities Sheet http://www.gmxresources.com/role/DerivativeActivities Derivative Activities false false R11.htm 2110100 - Disclosure - Stock Compensation Plans Sheet http://www.gmxresources.com/role/StockCompensationPlans Stock Compensation Plans false false R12.htm 2113100 - Disclosure - Capital Stock Sheet http://www.gmxresources.com/role/CapitalStock Capital Stock false false R13.htm 2116100 - Disclosure - Income Taxes Sheet http://www.gmxresources.com/role/IncomeTaxes Income Taxes false false R14.htm 2119100 - Disclosure - Commitments and Contingencies Sheet http://www.gmxresources.com/role/CommitmentsAndContingencies Commitments and Contingencies false false R15.htm 2122100 - Disclosure - Consolidating Financials Sheet http://www.gmxresources.com/role/ConsolidatingFinancials Consolidating Financials false false R16.htm 2201201 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Policies) Sheet http://www.gmxresources.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesPolicies Nature of Operations and Summary of Significant Accounting Policies (Policies) false false R17.htm 2304301 - Disclosure - Long-Term Debt (Tables) Sheet http://www.gmxresources.com/role/LongTermDebtTables Long-Term Debt (Tables) false false R18.htm 2307301 - Disclosure - Derivative Activities (Tables) Sheet http://www.gmxresources.com/role/DerivativeActivitiesTables Derivative Activities (Tables) false false R19.htm 2310301 - Disclosure - Stock Compensation Plans (Tables) Sheet http://www.gmxresources.com/role/StockCompensationPlansTables Stock Compensation Plans (Tables) false false R20.htm 2322301 - Disclosure - Consolidating Financials (Tables) Sheet http://www.gmxresources.com/role/ConsolidatingFinancialsTables Consolidating Financials (Tables) false false R21.htm 2401402 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Details) Sheet http://www.gmxresources.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesDetails Nature of Operations and Summary of Significant Accounting Policies (Details) false false R22.htm 2404402 - Disclosure - Long-Term Debt - Carrying Amounts and Approximate Fair Value of Debt Obligations (Details) Sheet http://www.gmxresources.com/role/LongTermDebtCarryingAmountsAndApproximateFairValueOfDebtObligationsDetails Long-Term Debt - Carrying Amounts and Approximate Fair Value of Debt Obligations (Details) false false R23.htm 2404403 - Disclosure - Long-Term Debt 5.00% Convertible Senior Notes (Details) Notes http://www.gmxresources.com/role/LongTermDebt500ConvertibleSeniorNotesDetails Long-Term Debt 5.00% Convertible Senior Notes (Details) false false R24.htm 2404404 - Disclosure - Long-Term Debt 4.50% Convertible Senior Notes (Details) Notes http://www.gmxresources.com/role/LongTermDebt450ConvertibleSeniorNotesDetails Long-Term Debt 4.50% Convertible Senior Notes (Details) false false R25.htm 2404405 - Disclosure - Long-Term Debt 11.375% Senior Notes (Details) Notes http://www.gmxresources.com/role/LongTermDebt11375SeniorNotesDetails Long-Term Debt 11.375% Senior Notes (Details) false false R26.htm 2404406 - Disclosure - Long-Term Debt 11.00% Senior Secured Notes (Details) Notes http://www.gmxresources.com/role/LongTermDebt1100SeniorSecuredNotesDetails Long-Term Debt 11.00% Senior Secured Notes (Details) false false R27.htm 2407402 - Disclosure - Derivative Activities - Narrative (Details) Sheet http://www.gmxresources.com/role/DerivativeActivitiesNarrativeDetails Derivative Activities - Narrative (Details) false false R28.htm 2407403 - Disclosure - Derivative Activities - Summary of Derivative Contracts (Details) Sheet http://www.gmxresources.com/role/DerivativeActivitiesSummaryOfDerivativeContractsDetails Derivative Activities - Summary of Derivative Contracts (Details) false false R29.htm 2407404 - Disclosure - Derivative Activities - Summary of Outstanding Derivative Contracts (Details) Sheet http://www.gmxresources.com/role/DerivativeActivitiesSummaryOfOutstandingDerivativeContractsDetails Derivative Activities - Summary of Outstanding Derivative Contracts (Details) false false R30.htm 2407405 - Disclosure - Derivative Activities - Summary of effect of derivatives qualifying as hedges (Details) Sheet http://www.gmxresources.com/role/DerivativeActivitiesSummaryOfEffectOfDerivativesQualifyingAsHedgesDetails Derivative Activities - Summary of effect of derivatives qualifying as hedges (Details) false false R31.htm 2407406 - Disclosure - Derivative Activities - Summary of effect of derivatives not qualifying for hedges (Details) Sheet http://www.gmxresources.com/role/DerivativeActivitiesSummaryOfEffectOfDerivativesNotQualifyingForHedgesDetails Derivative Activities - Summary of effect of derivatives not qualifying for hedges (Details) false false R32.htm 2407407 - Disclosure - Derivative Activities - Schedule of fair value, assets and liabilities measured on recurring basis (Details) Sheet http://www.gmxresources.com/role/DerivativeActivitiesScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails Derivative Activities - Schedule of fair value, assets and liabilities measured on recurring basis (Details) false false R33.htm 2410402 - Disclosure - Stock Compensation Plans (Details) Sheet http://www.gmxresources.com/role/StockCompensationPlansDetails Stock Compensation Plans (Details) false false R34.htm 2413401 - Disclosure - Capital Stock (Details) Sheet http://www.gmxresources.com/role/CapitalStockDetails Capital Stock (Details) false false R35.htm 2416401 - Disclosure - Income Taxes (Details) Sheet http://www.gmxresources.com/role/IncomeTaxesDetails Income Taxes (Details) false false R36.htm 2419401 - Disclosure - Commitments and Contingencies Commitments and Contingencies (Details) Sheet http://www.gmxresources.com/role/CommitmentsAndContingenciesCommitmentsAndContingenciesDetails Commitments and Contingencies Commitments and Contingencies (Details) false false R37.htm 2422402 - Disclosure - Consolidating Financials - Condensed Consolidating Balance Sheets (Details) Sheet http://www.gmxresources.com/role/ConsolidatingFinancialsCondensedConsolidatingBalanceSheetsDetails Consolidating Financials - Condensed Consolidating Balance Sheets (Details) false false R38.htm 2422403 - Disclosure - Consolidating Financials - Condensed Consolidating Statements of Operations (Details) Sheet http://www.gmxresources.com/role/ConsolidatingFinancialsCondensedConsolidatingStatementsOfOperationsDetails Consolidating Financials - Condensed Consolidating Statements of Operations (Details) false false R39.htm 2422404 - Disclosure - Consolidating Financials - Condensed Consolidating Statements of Cash Flows (Details) Sheet http://www.gmxresources.com/role/ConsolidatingFinancialsCondensedConsolidatingStatementsOfCashFlowsDetails Consolidating Financials - Condensed Consolidating Statements of Cash Flows (Details) false false All Reports Book All Reports Element us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax had a mix of decimals attribute values: -5 -3. Element us-gaap_AmortizationOfDebtDiscountPremium had a mix of decimals attribute values: -5 0. Element us-gaap_DebtInstrumentFaceAmount had a mix of decimals attribute values: -6 0. Element us-gaap_DebtInstrumentInterestRateStatedPercentage had a mix of decimals attribute values: 0 4. Element us-gaap_InterestExpenseDebt had a mix of decimals attribute values: -5 0. 'Monetary' elements on report '2401402 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2404403 - Disclosure - Long-Term Debt 5.00% Convertible Senior Notes (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2404404 - Disclosure - Long-Term Debt 4.50% Convertible Senior Notes (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2404405 - Disclosure - Long-Term Debt 11.375% Senior Notes (Details)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Jun. 30, 2011' Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 1002000 - Statement - Consolidated Statements of Operations Process Flow-Through: 1003000 - Statement - Consolidated Statements of Comprehensive Income Process Flow-Through: 1003501 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Process Flow-Through: 1004000 - Statement - Consolidated Statements of Cash Flows gmxr-20120630.xml gmxr-20120630.xsd gmxr-20120630_cal.xml gmxr-20120630_def.xml gmxr-20120630_lab.xml gmxr-20120630_pre.xml true true