2.3.0.15 Html 9 108 1 false 0 0 false 1 true false R1.htm 00 - Document - Document and Entity Information Sheet http://altamesa.net/role/DocumentAndEntityInformation Document and Entity Information false false R2.htm 01 - Statement - Consolidated Balance Sheets Sheet http://altamesa.net/role/BalanceSheets Consolidated Balance Sheets false false R3.htm 02 - Statement - Consolidated Statements of Income (Unaudited) Sheet http://altamesa.net/role/StatementsOfIncome Consolidated Statements of Income (Unaudited) false false R4.htm 03 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://altamesa.net/role/StatementsOfCashFlows Consolidated Statements of Cash Flows (Unaudited) false false R5.htm 06001 - Disclosure - Summary of Organization and Nature of Operations Sheet http://altamesa.net/role/SummaryOfOrganizationAndNatureOfOperations Summary of Organization and Nature of Operations false false R6.htm 06002 - Disclosure - Summary of Significant Accounting Policies Sheet http://altamesa.net/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies false false R7.htm 06003 - Disclosure - Significant Acquisitions Sheet http://altamesa.net/role/SignificantAcquisitions Significant Acquisitions false false R8.htm 06004 - Disclosure - Property and Equipment Sheet http://altamesa.net/role/PropertyAndEquipment Property and Equipment false false R9.htm 06005 - Disclosure - Fair Value Disclosures Sheet http://altamesa.net/role/FairValueDisclosures Fair Value Disclosures false false R10.htm 06006 - Disclosure - Derivative Financial Instruments Sheet http://altamesa.net/role/DerivativeFinancialInstruments Derivative Financial Instruments false false R11.htm 06007 - Disclosure - Asset Retirement Obligations Sheet http://altamesa.net/role/AssetRetirementObligations Asset Retirement Obligations false false R12.htm 06008 - Disclosure - Long-Term Debt and Notes Payable To Founder Notes http://altamesa.net/role/LongTermDebtAndNotesPayableToFounder Long-Term Debt and Notes Payable To Founder false false R13.htm 06009 - Disclosure - Accounts Payable and Accrued Liabilities Sheet http://altamesa.net/role/AccountsPayableAndAccruedLiabilities Accounts Payable and Accrued Liabilities false false R14.htm 06010 - Disclosure - Commitments and Contingencies Sheet http://altamesa.net/role/CommitmentsAndContingencies Commitments and Contingencies false false R15.htm 06011 - Disclosure - Significant Risks and Uncertainties Sheet http://altamesa.net/role/SignificantRisksAndUncertainties Significant Risks and Uncertainties false false R16.htm 06012 - Disclosure - Partners' Capital Sheet http://altamesa.net/role/PartnersCapital Partners' Capital false false R17.htm 06013 - Disclosure - Subsidiary Guarantors Sheet http://altamesa.net/role/SubsidiaryGuarantors Subsidiary Guarantors false false R18.htm 06014 - Disclosure - Subsequent Events Sheet http://altamesa.net/role/SubsequentEvents Subsequent Events false false All Reports Book All Reports Process Flow-Through: 01 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Sep. 30, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 02 - Statement - Consolidated Statements of Income (Unaudited) Process Flow-Through: 03 - Statement - Consolidated Statements of Cash Flows (Unaudited) altms-20110930.xml altms-20110930.xsd altms-20110930_cal.xml altms-20110930_lab.xml altms-20110930_pre.xml true true