3.19.3 html 484 431 1 false 87 0 false 9 false false R1.htm 0001000 - Document - Document And Entity Information Sheet http://www.altamesa.net/role/DocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 1001000 - Statement - Condensed Consolidated Statements Of Operations (Unaudited) Sheet http://www.altamesa.net/role/CondensedConsolidatedStatementsOfOperationsUnaudited Condensed Consolidated Statements Of Operations (Unaudited) Statements 2 false false R3.htm 1002000 - Statement - Condensed Consolidated Balance Sheets (Unaudited) Sheet http://www.altamesa.net/role/CondensedConsolidatedBalanceSheetsUnaudited Condensed Consolidated Balance Sheets (Unaudited) Statements 3 false false R4.htm 1002001 - Statement - Condensed Consolidated Balance Sheets (Unaudited) Condensed Consolidated Balance Sheet (Unaudited) Parenthetical Sheet http://www.altamesa.net/role/CondensedConsolidatedBalanceSheetsUnauditedCondensedConsolidatedBalanceSheetUnauditedParenthetical Condensed Consolidated Balance Sheets (Unaudited) Condensed Consolidated Balance Sheet (Unaudited) Parenthetical Statements 4 false false R5.htm 1003000 - Statement - Condensed Consolidated Statements Of Cash Flows (Unaudited) Sheet http://www.altamesa.net/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited Condensed Consolidated Statements Of Cash Flows (Unaudited) Statements 5 false false R6.htm 1004000 - Statement - Condensed Consolidated Statement Of Changes In Stockholders' Equity (Unaudited) (Successor) Sheet http://www.altamesa.net/role/CondensedConsolidatedStatementOfChangesInStockholdersEquityUnauditedSuccessor Condensed Consolidated Statement Of Changes In Stockholders' Equity (Unaudited) (Successor) Statements 6 false false R7.htm 1004000 - Statement - Condensed Consolidated Statements Of Changes In Partners' Capital (Unaudited) Sheet http://www.altamesa.net/role/CondensedConsolidatedStatementsOfChangesInPartnersCapitalUnaudited Condensed Consolidated Statements Of Changes In Partners' Capital (Unaudited) Statements 7 false false R8.htm 2101100 - Disclosure - Description of Business and Basis of Presentation Sheet http://www.altamesa.net/role/DescriptionOfBusinessAndBasisOfPresentation Description of Business and Basis of Presentation Notes 8 false false R9.htm 2102100 - Disclosure - Summary Of Significant Accounting Policies Sheet http://www.altamesa.net/role/SummaryOfSignificantAccountingPolicies Summary Of Significant Accounting Policies Notes 9 false false R10.htm 2103100 - Disclosure - Adoption of ASU No. 2016-02, Leases Sheet http://www.altamesa.net/role/AdoptionOfAsuNo201602Leases Adoption of ASU No. 2016-02, Leases Notes 10 false false R11.htm 2104100 - Disclosure - Earnings (Loss) Per Share Sheet http://www.altamesa.net/role/EarningsLossPerShare Earnings (Loss) Per Share Notes 11 false false R12.htm 2105100 - Disclosure - Supplemental Cash Flow Information Sheet http://www.altamesa.net/role/SupplementalCashFlowInformation Supplemental Cash Flow Information Notes 12 false false R13.htm 2106100 - Disclosure - Receivables Sheet http://www.altamesa.net/role/Receivables Receivables Notes 13 false false R14.htm 2107100 - Disclosure - Property And Equipment Sheet http://www.altamesa.net/role/PropertyAndEquipment Property And Equipment Notes 14 false false R15.htm 2108100 - Disclosure - Discontinued Operations Sheet http://www.altamesa.net/role/DiscontinuedOperations Discontinued Operations Notes 15 false false R16.htm 2109100 - Disclosure - Derivatives Sheet http://www.altamesa.net/role/Derivatives Derivatives Notes 16 false false R17.htm 2110100 - Disclosure - Accounts Payable And Accrued Liabilities Sheet http://www.altamesa.net/role/AccountsPayableAndAccruedLiabilities Accounts Payable And Accrued Liabilities Notes 17 false false R18.htm 2111100 - Disclosure - Asset Retirement Obligations Sheet http://www.altamesa.net/role/AssetRetirementObligations Asset Retirement Obligations Notes 18 false false R19.htm 2112100 - Disclosure - Debt Sheet http://www.altamesa.net/role/Debt Debt Notes 19 false false R20.htm 2113100 - Disclosure - Commitments And Contingencies Sheet http://www.altamesa.net/role/CommitmentsAndContingencies Commitments And Contingencies Notes 20 false false R21.htm 2114100 - Disclosure - Significant Concentrations Sheet http://www.altamesa.net/role/SignificantConcentrations Significant Concentrations Notes 21 false false R22.htm 2115100 - Disclosure - Equity-Based Compensation (Successor) Sheet http://www.altamesa.net/role/EquityBasedCompensationSuccessor Equity-Based Compensation (Successor) Notes 22 false false R23.htm 2116100 - Disclosure - Related Party Transactions Sheet http://www.altamesa.net/role/RelatedPartyTransactions Related Party Transactions Notes 23 false false R24.htm 2117100 - Disclosure - Business Segment Information Sheet http://www.altamesa.net/role/BusinessSegmentInformation Business Segment Information Notes 24 false false R25.htm 2202201 - Disclosure - Summary Of Significant Accounting Policies (Policies) Sheet http://www.altamesa.net/role/SummaryOfSignificantAccountingPoliciesPolicies Summary Of Significant Accounting Policies (Policies) Policies http://www.altamesa.net/role/SummaryOfSignificantAccountingPolicies 25 false false R26.htm 2303301 - Disclosure - Adoption of ASU No. 2016-02, Leases (Tables) Sheet http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesTables Adoption of ASU No. 2016-02, Leases (Tables) Tables http://www.altamesa.net/role/AdoptionOfAsuNo201602Leases 26 false false R27.htm 2304301 - Disclosure - Earnings (Loss) Per Share (Tables) Sheet http://www.altamesa.net/role/EarningsLossPerShareTables Earnings (Loss) Per Share (Tables) Tables http://www.altamesa.net/role/EarningsLossPerShare 27 false false R28.htm 2305301 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://www.altamesa.net/role/SupplementalCashFlowInformationTables Supplemental Cash Flow Information (Tables) Tables http://www.altamesa.net/role/SupplementalCashFlowInformation 28 false false R29.htm 2306301 - Disclosure - Receivables (Tables) Sheet http://www.altamesa.net/role/ReceivablesTables Receivables (Tables) Tables http://www.altamesa.net/role/Receivables 29 false false R30.htm 2307301 - Disclosure - Property And Equipment (Tables) Sheet http://www.altamesa.net/role/PropertyAndEquipmentTables Property And Equipment (Tables) Tables http://www.altamesa.net/role/PropertyAndEquipment 30 false false R31.htm 2308301 - Disclosure - Discontinued Operations (Tables) Sheet http://www.altamesa.net/role/DiscontinuedOperationsTables Discontinued Operations (Tables) Tables http://www.altamesa.net/role/DiscontinuedOperations 31 false false R32.htm 2309301 - Disclosure - Derivatives (Tables) Sheet http://www.altamesa.net/role/DerivativesTables Derivatives (Tables) Tables http://www.altamesa.net/role/Derivatives 32 false false R33.htm 2310301 - Disclosure - Accounts Payable And Accrued Liabilities (Tables) Sheet http://www.altamesa.net/role/AccountsPayableAndAccruedLiabilitiesTables Accounts Payable And Accrued Liabilities (Tables) Tables http://www.altamesa.net/role/AccountsPayableAndAccruedLiabilities 33 false false R34.htm 2311301 - Disclosure - Asset Retirement Obligations (Tables) Sheet http://www.altamesa.net/role/AssetRetirementObligationsTables Asset Retirement Obligations (Tables) Tables http://www.altamesa.net/role/AssetRetirementObligations 34 false false R35.htm 2312301 - Disclosure - Debt (Tables) Sheet http://www.altamesa.net/role/DebtTables Debt (Tables) Tables http://www.altamesa.net/role/Debt 35 false false R36.htm 2314301 - Disclosure - Significant Concentrations (Tables) Sheet http://www.altamesa.net/role/SignificantConcentrationsTables Significant Concentrations (Tables) Tables http://www.altamesa.net/role/SignificantConcentrations 36 false false R37.htm 2315301 - Disclosure - Equity-Based Compensation (Successor) (Tables) Sheet http://www.altamesa.net/role/EquityBasedCompensationSuccessorTables Equity-Based Compensation (Successor) (Tables) Tables http://www.altamesa.net/role/EquityBasedCompensationSuccessor 37 false false R38.htm 2317301 - Disclosure - Business Segment Information (Tables) Sheet http://www.altamesa.net/role/BusinessSegmentInformationTables Business Segment Information (Tables) Tables http://www.altamesa.net/role/BusinessSegmentInformation 38 false false R39.htm 2402402 - Disclosure - Summary Of Significant Accounting Policies (Details) Sheet http://www.altamesa.net/role/SummaryOfSignificantAccountingPoliciesDetails Summary Of Significant Accounting Policies (Details) Details http://www.altamesa.net/role/SummaryOfSignificantAccountingPoliciesPolicies 39 false false R40.htm 2403402 - Disclosure - Adoption of ASU No. 2016-02, Leases (Narrative) (Details) Sheet http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesNarrativeDetails Adoption of ASU No. 2016-02, Leases (Narrative) (Details) Details http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesTables 40 false false R41.htm 2403403 - Disclosure - Adoption of ASU No. 2016-02, Leases (Lease Costs) (Details) Sheet http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesLeaseCostsDetails Adoption of ASU No. 2016-02, Leases (Lease Costs) (Details) Details http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesTables 41 false false R42.htm 2403404 - Disclosure - Adoption of ASU No. 2016-02, Leases (Operating Lease Liability Maturities) (Details) Sheet http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesOperatingLeaseLiabilityMaturitiesDetails Adoption of ASU No. 2016-02, Leases (Operating Lease Liability Maturities) (Details) Details http://www.altamesa.net/role/AdoptionOfAsuNo201602LeasesTables 42 false false R43.htm 2404402 - Disclosure - Earnings (Loss) Per Share (Details) Sheet http://www.altamesa.net/role/EarningsLossPerShareDetails Earnings (Loss) Per Share (Details) Details http://www.altamesa.net/role/EarningsLossPerShareTables 43 false false R44.htm 2405402 - Disclosure - Supplemental Cash Flow Information (Details) Sheet http://www.altamesa.net/role/SupplementalCashFlowInformationDetails Supplemental Cash Flow Information (Details) Details http://www.altamesa.net/role/SupplementalCashFlowInformationTables 44 false false R45.htm 2406402 - Disclosure - Receivables (Schedule of Accounts Receivable) (Details) Sheet http://www.altamesa.net/role/ReceivablesScheduleOfAccountsReceivableDetails Receivables (Schedule of Accounts Receivable) (Details) Details http://www.altamesa.net/role/ReceivablesTables 45 false false R46.htm 2406403 - Disclosure - Receivables (Schedule of Related Party Receivables) (Details) Sheet http://www.altamesa.net/role/ReceivablesScheduleOfRelatedPartyReceivablesDetails Receivables (Schedule of Related Party Receivables) (Details) Details http://www.altamesa.net/role/ReceivablesTables 46 false false R47.htm 2406404 - Disclosure - Receivables Receivables (Narrative) (Details) Sheet http://www.altamesa.net/role/ReceivablesReceivablesNarrativeDetails Receivables Receivables (Narrative) (Details) Details 47 false false R48.htm 2406405 - Disclosure - Receivables (Management Services Agreement with High Mesa) (Details) Sheet http://www.altamesa.net/role/ReceivablesManagementServicesAgreementWithHighMesaDetails Receivables (Management Services Agreement with High Mesa) (Details) Details http://www.altamesa.net/role/ReceivablesTables 48 false false R49.htm 2407402 - Disclosure - Property And Equipment (Summary Of Property And Equipment) (Details) Sheet http://www.altamesa.net/role/PropertyAndEquipmentSummaryOfPropertyAndEquipmentDetails Property And Equipment (Summary Of Property And Equipment) (Details) Details http://www.altamesa.net/role/PropertyAndEquipmentTables 49 false false R50.htm 2407403 - Disclosure - Property And Equipment (Depreciation and Depletion Expense) (Details) Sheet http://www.altamesa.net/role/PropertyAndEquipmentDepreciationAndDepletionExpenseDetails Property And Equipment (Depreciation and Depletion Expense) (Details) Details http://www.altamesa.net/role/PropertyAndEquipmentTables 50 false false R51.htm 2408402 - Disclosure - Discontinued Operations (Schedule Of Operations And Other Items Reclassified In Discontinued Operations) (Details) Sheet http://www.altamesa.net/role/DiscontinuedOperationsScheduleOfOperationsAndOtherItemsReclassifiedInDiscontinuedOperationsDetails Discontinued Operations (Schedule Of Operations And Other Items Reclassified In Discontinued Operations) (Details) Details http://www.altamesa.net/role/DiscontinuedOperationsTables 51 false false R52.htm 2408403 - Disclosure - Discontinued Operations (Total Operating And Investing Cash Flows Of Discontinued Operations) (Details) Sheet http://www.altamesa.net/role/DiscontinuedOperationsTotalOperatingAndInvestingCashFlowsOfDiscontinuedOperationsDetails Discontinued Operations (Total Operating And Investing Cash Flows Of Discontinued Operations) (Details) Details http://www.altamesa.net/role/DiscontinuedOperationsTables 52 false false R53.htm 2409402 - Disclosure - Derivatives (Fair Values Of Derivative Contracts) (Details) Sheet http://www.altamesa.net/role/DerivativesFairValuesOfDerivativeContractsDetails Derivatives (Fair Values Of Derivative Contracts) (Details) Details http://www.altamesa.net/role/DerivativesTables 53 false false R54.htm 2409403 - Disclosure - Derivatives (Effect Of Derivative Instruments In The Consolidated Statements Of Operations) (Details) Sheet http://www.altamesa.net/role/DerivativesEffectOfDerivativeInstrumentsInConsolidatedStatementsOfOperationsDetails Derivatives (Effect Of Derivative Instruments In The Consolidated Statements Of Operations) (Details) Details http://www.altamesa.net/role/DerivativesTables 54 false false R55.htm 2409404 - Disclosure - Derivatives (Additional Information) (Details) Sheet http://www.altamesa.net/role/DerivativesAdditionalInformationDetails Derivatives (Additional Information) (Details) Details http://www.altamesa.net/role/DerivativesTables 55 false false R56.htm 2409405 - Disclosure - Derivatives (Oil Derivative Contracts) (Details) Sheet http://www.altamesa.net/role/DerivativesOilDerivativeContractsDetails Derivatives (Oil Derivative Contracts) (Details) Details http://www.altamesa.net/role/DerivativesTables 56 false false R57.htm 2409406 - Disclosure - Derivatives (Natural Gas Derivative Contracts) (Details) Sheet http://www.altamesa.net/role/DerivativesNaturalGasDerivativeContractsDetails Derivatives (Natural Gas Derivative Contracts) (Details) Details http://www.altamesa.net/role/DerivativesTables 57 false false R58.htm 2409407 - Disclosure - Derivatives (Basis Swap Derivative Contracts) (Details) Sheet http://www.altamesa.net/role/DerivativesBasisSwapDerivativeContractsDetails Derivatives (Basis Swap Derivative Contracts) (Details) Details http://www.altamesa.net/role/DerivativesTables 58 false false R59.htm 2410402 - Disclosure - Accounts Payable And Accrued Liabilities (Details) Sheet http://www.altamesa.net/role/AccountsPayableAndAccruedLiabilitiesDetails Accounts Payable And Accrued Liabilities (Details) Details http://www.altamesa.net/role/AccountsPayableAndAccruedLiabilitiesTables 59 false false R60.htm 2411402 - Disclosure - Asset Retirement Obligations (Details) Sheet http://www.altamesa.net/role/AssetRetirementObligationsDetails Asset Retirement Obligations (Details) Details http://www.altamesa.net/role/AssetRetirementObligationsTables 60 false false R61.htm 2412402 - Disclosure - Debt (Schedule of Long-Term Debt, Net) (Details) Sheet http://www.altamesa.net/role/DebtScheduleOfLongTermDebtNetDetails Debt (Schedule of Long-Term Debt, Net) (Details) Details http://www.altamesa.net/role/DebtTables 61 false false R62.htm 2412403 - Disclosure - Debt (Narrative) (Details) Sheet http://www.altamesa.net/role/DebtNarrativeDetails Debt (Narrative) (Details) Details http://www.altamesa.net/role/DebtTables 62 false false R63.htm 2412404 - Disclosure - Debt (Summary Of Future Maturities Of Long-Term Debt) (Details) Sheet http://www.altamesa.net/role/DebtSummaryOfFutureMaturitiesOfLongTermDebtDetails Debt (Summary Of Future Maturities Of Long-Term Debt) (Details) Details http://www.altamesa.net/role/DebtTables 63 false false R64.htm 2414402 - Disclosure - Significant Concentrations (Details) Sheet http://www.altamesa.net/role/SignificantConcentrationsDetails Significant Concentrations (Details) Details http://www.altamesa.net/role/SignificantConcentrationsTables 64 false false R65.htm 2415402 - Disclosure - Equity-Based Compensation (Successor) (Stock Compensation Expense) (Details) Sheet http://www.altamesa.net/role/EquityBasedCompensationSuccessorStockCompensationExpenseDetails Equity-Based Compensation (Successor) (Stock Compensation Expense) (Details) Details http://www.altamesa.net/role/EquityBasedCompensationSuccessorTables 65 false false R66.htm 2415403 - Disclosure - Equity-Based Compensation (Successor) (Narrative) (Details) Sheet http://www.altamesa.net/role/EquityBasedCompensationSuccessorNarrativeDetails Equity-Based Compensation (Successor) (Narrative) (Details) Details http://www.altamesa.net/role/EquityBasedCompensationSuccessorTables 66 false false R67.htm 2416401 - Disclosure - Related Party Transactions (Details) Sheet http://www.altamesa.net/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://www.altamesa.net/role/RelatedPartyTransactions 67 false false R68.htm 2417402 - Disclosure - Business Segment Information (Details) Sheet http://www.altamesa.net/role/BusinessSegmentInformationDetails Business Segment Information (Details) Details http://www.altamesa.net/role/BusinessSegmentInformationTables 68 false false R9999.htm Uncategorized Items - amr-063019x10q.htm Sheet http://xbrl.sec.gov/role/uncategorizedFacts Uncategorized Items - amr-063019x10q.htm Cover 69 false false All Reports Book All Reports amr-063019x10q.htm amr-20190630.xsd amr-20190630_cal.xml amr-20190630_def.xml amr-20190630_lab.xml amr-20190630_pre.xml amr_exhibit311-06302019.htm amr_exhibit312-06302019.htm amr_exhibit321-06302019.htm amr_exhibit322-06302019.htm http://fasb.org/srt/2018-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/us-gaap/2018-01-31 true true