Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Asset Acquisition [Table] Asset Acquisition [Table] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Netting Adjustment Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Total Derivative Assets (Liabilities), at Fair Value, Net Weighted average interest rate (as percent) Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount PSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Propane Fixed Price Swap Propane Fixed Price Swap [Member] Propane Fixed Price Swap Common stock value Common Stock, Value, Issued Shares of Class A common stock withheld for employee tax obligations upon vesting RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Adjustment of redeemable non-controlling interest to redemption value Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock Floor price Derivative, Floor Price Line of Credit Line of Credit [Member] Entity Ex Transition Period Entity Ex Transition Period Restatement Determination Date Restatement Determination Date Netting Adjustment Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Supply Commitment [Axis] Supply Commitment [Axis] Non-cash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction (Increase) Operating Lease, Right-of-Use Asset, Periodic Reduction (Increase) Derivative Instrument [Axis] Derivative Instrument [Axis] Accrued capital expenditures Capital Expenditures, Current Capital Expenditures, Current Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Oil Fixed Price Swap 2028 Oil Fixed Price Swap 2028 [Member] Oil Fixed Price Swap 2028 Proceeds from capital contributions Proceeds from Contributed Capital Additions to midstream and other property and equipment Payments to Acquire Other Property, Plant, and Equipment Addition to other liabilities under Tax Receivable Agreement Increase (Decrease) in Deferred Income Taxes Normal Butane Fixed Price Swap Normal Butane Fixed Price Swap [Member] Normal Butane Fixed Price Swap Issuance of Class A common stock for acquisition Stock Issued During Period, Value, Acquisitions Stockholders’ equity Members' Equity [Abstract] Unproved properties Oil and Gas, Capitalized Cost, before Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance, Unproved Property Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province Drilling Rig Service Drilling Rig Service [Member] Drilling Rig Service PEO Total Compensation Amount PEO Total Compensation Amount Common stock par value (in dollars per share) Common Stock, Par or Stated Value Per Share Asset Acquisition [Axis] Asset Acquisition [Axis] Unvested as of beginning of period (in shares) Unvested as of end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Accrued and other expenses Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Weighted-average common stock outstanding—basic (in shares) Weighted average number of common units outstanding—basic (in shares) Weighted Average Number of Shares Outstanding, Basic Preferred stock, dividend rate, percentage, paid-in-kind Preferred Stock, Dividend Rate, Percentage, Increase Limit Preferred Stock, Dividend Rate, Percentage, Increase Limit Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend Pentane Fixed Price Swap 2028 Pentane Fixed Price Swap 2028 [Member] Pentane Fixed Price Swap 2028 Commodity derivative liabilities, short-term Derivative Liability, Current Isobutane Isobutane [Member] Isobutane Entity Address, City or Town Entity Address, City or Town Asset acquisition, consideration transferred Total estimated consideration Asset Acquisition, Consideration Transferred Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Net income (loss) attributable to Infinity Natural Resources, Inc. Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) Attributable To Parent, After Tax Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) Attributable To Parent, After Tax Percentage of payment of net cash savings Sale Of Stock, Percentage Of Payment Of Net Cash Savings Sale Of Stock, Percentage Of Payment Of Net Cash Savings Equity awards granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Title and Position [Domain] Title and Position [Domain] Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Vested and settled (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Debt issuance costs Debt Issuance Costs, Gross Exchange of INR Units for Class A common stock Temporary Equity, Stock Issued During Period, Value, Conversion of Units Temporary Equity, Stock Issued During Period, Value, Conversion of Units Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Right-of-use assets and lease liabilities recognized Right-Of-Use Assets And Lease Liabilities Right-Of-Use Assets And Lease Liabilities Series A Preferred Stock cumulative undeclared dividends Dividends, Preferred Stock Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Normal Butane Fixed Price Swap 2026 Normal Butane Fixed Price Swap 2026 [Member] Normal Butane Fixed Price Swap 2026 Debt covenant, minimum current ratio Debt Instrument, Covenant, Current Ratio, Minimum Debt Instrument, Covenant, Current Ratio, Minimum Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Additions to other property and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Use of Estimates Use of Estimates, Policy [Policy Text Block] Acquisitions Asset Acquisition [Text Block] Amortization of debt issuance costs Amortization of Debt Issuance Costs Accrued Liabilities and Other Schedule of Accrued Liabilities [Table Text Block] Isobutane Fixed Price Swap 2026 Isobutane Fixed Price Swap 2026 [Member] Isobutane Fixed Price Swap 2026 Property, Plant, and Equipment Property, Plant, and Equipment [Text Block] Preferred stock, convertible, conversion term Preferred Stock, Convertible, Conversion Term Preferred Stock, Convertible, Conversion Term Ethane Fixed Price Swap 2026 Ethane Fixed Price Swap 2026 [Member] Ethane Fixed Price Swap 2026 Document Period End Date Document Period End Date Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Propane Fixed Price Swap 2027 Propane Fixed Price Swap 2027 [Member] Propane Fixed Price Swap 2027 Debt Instrument, face amount Debt Instrument, Face Amount Series A Convertible Preferred Stock Stockholders' Equity and Noncontrolling Interest Equity [Text Block] Temporary equity outstanding (in shares) Temporary Equity, Shares Outstanding Security Exchange Name Security Exchange Name Netting Adjustment Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Series A Convertible Preferred Stock Series A Convertible Preferred Stock [Member] Series A Convertible Preferred Stock Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Entity Shell Company Entity Shell Company Class B Common Class B [Member] Share reserved for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Royalties payable Increase (Decrease) in Royalties Payable Operating lease liabilities Operating Lease, Liability, Current Accrued interest expense Interest Payable, Current Property, Plant, and Equipment Property, Plant, and Equipment [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Diluted net income (loss) per share (in dollars per share) Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax, Per Diluted Share Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax, Per Diluted Share Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Effect of the reorganization transactions (in shares) Stock Issued During Period, Shares, Effect Of Reorganization Items Stock Issued During Period, Shares, Effect Of Reorganization Items Total liabilities Liabilities Trading Symbol Trading Symbol Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Oil and natural gas properties, full cost method (including $114.2 million and $88.7 million as of June 30, 2026 and December 31, 2025, respectively, excluded from amortization) Oil and Gas, Full Cost Method, Property and Equipment, before Accumulated Depletion Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Midstream assets Midstream Assets [Member] Midstream Assets Company Selected Measure Name Company Selected Measure Name Net assets acquired Asset Acquisition, Assets Acquired and Liabilities Assumed, Net Asset Acquisition, Assets Acquired and Liabilities Assumed, Net Income Tax Disclosure [Abstract] Cash paid on settlement of derivative instruments Proceeds From (Repayments Of) Dividend Settlements Proceeds From (Repayments Of) Dividend Settlements Supplemental disclosure of non-cash transactions: Noncash Investing and Financing Items [Abstract] Unrealized gain (loss) on derivative instruments Unrealized Gain (Loss) on Derivatives Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Including Discrete Items, Percent Effective Income Tax Rate Reconciliation, Including Discrete Items, Percent Credit Facility [Domain] Credit Facility [Domain] Depreciation, depletion, and amortization Depreciation, Depletion and Amortization, Nonproduction Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Debt covenant, maximum leverage ratio Debt Instrument, Covenant, Leverage Ratio, Maximum Debt Instrument, Covenant, Leverage Ratio, Maximum Ethane Fixed Price Swap Ethane Fixed Price Swap [Member] Ethane Fixed Price Swap Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted-average common stock outstanding—diluted (in shares) Weighted-average shares of Class A common stock outstanding—diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Useful life (in years) Property, Plant, and Equipment, Useful Life Volume Derivative, Nonmonetary Notional Amount, Volume Antero Acquisition Payments to Acquire Oil and Gas Property and Equipment Underlying Security Market Price Change Underlying Security Market Price Change, Percent Midstream and other property and equipment Gross midstream and other property and equipment Property, Plant, and Equipment, Other, before Accumulated Depreciation Derivatives and Risk Management Derivative Instruments and Hedging Activities Disclosure [Text Block] Effect of the reorganization transaction Members' Equity, Effect Of Reorganization Members' Equity, Effect Of Reorganization Award vesting rights, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Ethane Fixed Price Swap 2027 Ethane Fixed Price Swap 2027 [Member] Ethane Fixed Price Swap 2027 Gross Amounts Derivative Liability, Subject to Master Netting Arrangement, before Offset Effect of the reorganization transaction Temporary Equity, Value, Effect Of Reorganization Items Temporary Equity, Value, Effect Of Reorganization Items Revenue from Contract with Customer [Abstract] Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Collars Collar [Member] Collar Award Timing Predetermined Award Timing Predetermined [Flag] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Net Amounts Presented on Balance Sheet Derivative Liability, Subject to Master Netting Arrangement, after Offset Oil Fixed Price Swap Oil Fixed Price Swap [Member] Oil Fixed Price Swap Commodity derivative assets Derivative Asset, Noncurrent Net income (loss) Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Natural Gas Basis Swap Natural Gas Basis Swap [Member] Natural Gas Basis Swap Unvested as of beginning of period (in dollars per share) Unvested as of end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Shares repurchased and retired Stock Repurchased and Retired During Period, Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Payments on revolving credit facility Repayments of Long-Term Lines of Credit Total liabilities assumed Asset Acquisition, Liabilities Assumed Asset Acquisition, Liabilities Assumed Preferred stock par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, dividend rate, automatic increase, percentage Preferred Stock, Dividend Rate, Automatic Increase, Percentage Preferred Stock, Dividend Rate, Automatic Increase, Percentage Redeemable non-controlling interest Redeemable non-controlling interest, beginning balance Redeemable non-controlling interest, ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Depreciation Depreciation Asset Acquisition [Domain] Asset Acquisition [Domain] Scenario [Domain] Scenario [Domain] Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Depletion of Proved Oil and Natural Gas Properties Depletion of Oil and Gas Properties Preferred stock, convertible, conversion price (in dollars per share) Preferred Stock, Convertible, Conversion Price Computation of Diluted Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Preferred stock, convertible, threshold, percentage Preferred Stock, Convertible, Threshold, Percentage Preferred Stock, Convertible, Threshold, Percentage Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Information Segment Reporting [Text Block] Line-of-credit Long-Term Line of Credit Minimum Minimum [Member] Expiration Date Trading Arrangement Expiration Date Transportation commitment Contractual Obligation, Transportation Commitment Contractual Obligation, Transportation Commitment Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Weighted average number of shares of Class A common stock outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Payments on notes payable Repayments of Notes Payable Preferred Stock issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other income (expense): Other Income and Expenses [Abstract] Less: Accumulated depreciation, depletion, and amortization Accumulated Depreciation, Depletion And Amortization, Property, Plant, Equipment, And Oil And Natural Gas Accumulated Depreciation, Depletion And Amortization, Property, Plant, Equipment, And Oil And Natural Gas Common stock authorized (in shares) Common Stock, Shares Authorized Gross oil and natural gas properties Oil and Gas, Capitalized Cost, before Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] NGL revenues Natural Gas Liquids (NGL) [Member] Income from operations Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Assets Derivative Asset [Abstract] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Basis swaps Interest Rate Swap [Member] Midstream Operations and Maintenance Expense Property, Plant, and Equipment [Policy Text Block] Long-Term Debt Debt Disclosure [Text Block] RSUs capitalized Impact Of Non-Cash Asset Retirement Obligations, Net Impact Of Non-Cash Asset Retirement Obligations, Net Net income attributable to Infinity Natural Resources, Inc. - diluted Undistributed Earnings (Loss) Available to Common Shareholders, Diluted Common stock, voting right Common Stock, Voting Right Common Stock, Voting Right Scenario [Axis] Scenario [Axis] Minimum payment due if obligation is unmet Contractual Obligation Capitalized debt issuance costs Debt Issuance Costs, Net Liabilities Derivative Liability [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Oil revenues Oil Crude Oil, Condensate, and Natural Gas Liquids (NGL) [Member] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Long-term debt Long-Term Line of Credit, Noncurrent Income tax expense (benefit) Income Tax Expense (Benefit), Gross Income Tax Expense (Benefit), Gross Adoption Date Trading Arrangement Adoption Date Dividend cash paid amount Dividends, Common Stock, Cash Counterparty Name [Domain] Counterparty Name [Domain] Debt instrument, interest rate, stated percentage (as percent) Debt Instrument, Interest Rate, Stated Percentage Total stockholders’ equity Equity, beginning balance Equity, ending balance Equity, Attributable to Parent Natural Gas NYMEX 2030 Natural Gas NYMEX 2030 [Member] Natural Gas NYMEX 2030 Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Risk-free rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Oil and Gas, Average Sale Price and Production Cost Oil and Gas, Average Sale Price and Production Cost [Table Text Block] Underwriting discounts and commissions Payments of Stock Issuance Costs Insider Trading Policies and Procedures [Line Items] Accrued Liabilities and Other Accounts Payable and Accrued Liabilities Disclosure [Text Block] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Series A Preferred Stock Performance Shares [Member] Natural Gas NYMEX 2026 Natural Gas NYMEX 2026 [Member] Natural Gas NYMEX 2026 Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred income taxes Deferred Income Tax Expense (Benefit) Interest, net Interest Income (Expense), Nonoperating Natural Gas Fixed Price Swap Natural Gas Fixed Price Swap [Member] Natural Gas Fixed Price Swap Additions to oil and gas properties Payments to Explore and Develop Oil and Gas Properties Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Natural Gas NYMEX 2029 Natural Gas NYMEX 2029 [Member] Natural Gas NYMEX 2029 Cash Payments For Asset Acquisitions, Gross Payments For Asset Acquisitions, Gross RSUs Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key Less: accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization All Adjustments to Compensation All Adjustments to Compensation [Member] Normal butane Butane [Member] Butane Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Income Taxes Income Tax, Policy [Policy Text Block] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Preferred stock, dividend rate, percentage Preferred Stock, Dividend Rate, Percentage Designated as Hedging Instrument Designated as Hedging Instrument [Member] Operating expenses: Operating Expenses [Abstract] Deferred tax asset, net Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Series A Preferred Stock Preferred Stock, Redeemable [Policy Text Block] JIB advance deposits Deferred Revenue, Current Basis spread on variable rate (as percent) Debt Instrument, Basis Spread on Variable Rate Natural Gas NYMEX 2028 Natural Gas NYMEX 2028 [Member] Natural Gas NYMEX 2028 City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Exchange of INR Units for Class A common stock Stock Issued During Period, Value, Conversion of Units Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Accounts receivable terms (in days) Accounts Receivable, Payment Terms Accounts Receivable, Payment Terms Name Forgone Recovery, Individual Name Unrecognized compensation expense, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted-average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Midstream and other property and equipment Asset Acquisition, Midstream And Other Property And Equipment Asset Acquisition, Midstream And Other Property And Equipment Statement [Line Items] Statement [Line Items] Total assets Assets Natural Gas NYMEX 2027 Natural Gas NYMEX 2027 [Member] Natural Gas NYMEX 2027 Entity [Domain] Entity [Domain] Energy measure Derivative, Nonmonetary Notional Amount, Energy Measure INR Holdings INR Holdings [Member] INR Holdings Non-Employee Directors Non-Employee Directors [Member] Non-Employee Directors Share-based Compensation Share-Based Payment Arrangement [Policy Text Block] Share-based Compensation Share-Based Payment Arrangement [Text Block] Issuance of common stock in connection with initial public offering, net of underwriting discounts, commissions and other offering costs (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] Compensation expense Share-Based Payment Arrangement, Expense 7.65% Senior Unsecured Notes due 2031 Seven Point Ssix Five Percentage Senior Notes Due Two Thousand Thirty One [Member] Seven Point Ssix Five Percentage Senior Notes Due Two Thousand Thirty One Shares repurchased and retired (in shares) Stock Repurchased and Retired During Period, Shares Preferred stock, voting rights, percentage Preferred Stock, Voting Rights, Percentage Preferred Stock, Voting Rights, Percentage Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Pentane Fixed Price Swap Pentane Fixed Price Swap [Member] Pentane Fixed Price Swap Subsequent Event Type [Domain] Subsequent Event Type [Domain] Acquisition of oil and gas property in exchange for Class A common stock Fair Value of Assets Acquired Payables and Accruals [Abstract] Accumulated Deficit Retained Earnings [Member] Operating lease liabilities, non-current Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] Canceled/forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Series A Preferred Stock Series A Preferred Stock [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock outstanding (in shares) Equity, beginning balance (in shares) Equity, ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Payments of credit facility debt issuance costs Payments of Debt Issuance Costs Net income (loss) attributable to Infinity Natural Resources, Inc. — diluted (in dollars per share) Net income (loss) available to Class A common stockholders per share - diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Business combination, percentage of assets acquired Asset Acquisition, Percentage Of Assets Acquired Asset Acquisition, Percentage Of Assets Acquired Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Interest costs capitalized Interest Costs Capitalized Joint interest and other, net Oil and Gas, Joint Interest Billing, Receivable, Current Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Ownership interest (as a percent) Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Ownership [Domain] Ownership [Domain] Schedule of Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Borrowings under revolving credit facility Proceeds from Long-Term Lines of Credit Midstream operations and maintenance expense Utilities Operating Expense, Maintenance and Operations Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Schedule of Offsetting Assets Offsetting Assets [Table Text Block] Natural gas revenues Natural gas Natural Gas [Member] Summary of PSU Activity Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] Temporary equity par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Antero Acquisition Antero Acquisition [Member] Antero Acquisition Maximum Daily Quantity Maximum Daily Quantity [Member] Maximum Daily Quantity Share-Based Payment Arrangement [Abstract] Total midstream and other property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Oil, natural gas, and natural gas liquids sales Revenue from Contract with Customer, Excluding Assessed Tax Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Commitment fee percentage (as percent) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Preferred stock, redemption, return on invested capital Preferred Stock, Redemption, Return On Invested Capital Preferred Stock, Redemption, Return On Invested Capital Temporary equity, stock issued during period, value, new issues, gross Temporary Equity, Stock Issued During Period, Value, New Issues, Gross Temporary Equity, Stock Issued During Period, Value, New Issues, Gross Oil Fixed Price Swap 2027 Oil Fixed Price Swap 2027 [Member] Oil Fixed Price Swap 2027 Total assets acquired Asset Acquisition, Assets Acquired Asset Acquisition, Assets Acquired Basis differential Derivative, Swap Type, Fixed Price Commodity derivative assets, long-term Derivative Asset Isobutane Fixed Price Swap 2027 Isobutane Fixed Price Swap 2027 [Member] Isobutane Fixed Price Swap 2027 Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Oil, natural gas, and natural gas liquids sales Oil, Natural Gas, And Natural Gas Liquids [Member] Oil, Natural Gas, And Natural Gas Liquids Underlying Securities Award Underlying Securities Amount Revenues Revenue from Contract with Customer [Text Block] Issuance of common stock in connection with IPO, net of underwriting discounts, commissions and other offering costs Stock Issued During Period, Value, New Issues Acquisition of oil and gas property from settlement of accounts receivable Acquisition Of Oil And Gas Property From Settlement Of Accounts Receivable Acquisition Of Oil And Gas Property From Settlement Of Accounts Receivable Issuance of Class A common stock for acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Summary of RSU Activity Nonvested Restricted Stock Shares Activity [Table Text Block] Net income (loss) Temporary Equity, Net Income Ethane Ethane [Member] Ethane Title and Position [Axis] Title and Position [Axis] Cash deposit held in escrow Escrow Deposit Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Gain (loss) on derivative instruments Loss (gain) on derivative instruments Total gain (loss) on derivative instruments Derivative, Gain (Loss) on Derivative, Net Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Preferred stock, redemption, internal rate of return on initial liquidation preference Preferred Stock, Redemption, Internal Rate Of Return On Initial Liquidation Preference Preferred Stock, Redemption, Internal Rate Of Return On Initial Liquidation Preference Operating income (loss) Operating Income (Loss) Temporary equity, issuance costs Temporary Equity, Issuance Costs Temporary Equity, Issuance Costs Current Fiscal Year End Date Current Fiscal Year End Date INR, Inc. Members' Equity, beginning balance INR, Inc. Members' Equity, ending balance Members' Equity Proceeds from issuance of Notes Proceeds from Issuance of Debt Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Vehicles Vehicles [Member] Issuance of common stock in connection with IPO, net of underwriting discounts, commissions and other offering costs Temporary Equity, Stock Issued During Period, Value, New Issues Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Entity File Number Entity File Number Other property and equipment Other Property And Equipment [Member] Other Property And Equipment Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Recovery of Erroneously Awarded 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Asset Retirement Obligations, Noncurrent Royalties payable Accrued Royalties, Current TRA non-current liability Noncurrent Portion Of Tax Receivable Agreement Liability Noncurrent Portion Of Tax Receivable Agreement Liability Accrued general and administrative expenses General And Administrative Expense, Current General And Administrative Expense, Current Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Schedule of Purchase Price Allocation Asset Acquisition [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Class A Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Net income attributable to Infinity Natural Resources, Inc. - basic Undistributed Earnings (Loss) Available to Common Shareholders, 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revisions Asset Retirement Obligation, Period Increase (Decrease) Accrued liabilities and other Total accrued liabilities Accrued Liabilities, Current Fixed price swaps Fixed-Price Contract [Member] Fair Value as of Grant Date Award Grant Date Fair Value Debt instrument, redemption price (as percent) Debt Instrument, Redemption Price, Percentage Natural Gas and Natural Gas Liquids (NGL) Natural Gas and Natural Gas Liquids (NGL) [Member] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Natural Gas NYMEX Natural Gas NYMEX [Member] Natural Gas NYMEX Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Propane Propane [Member] Supply Commitment Arrangement [Domain] Supply Commitment Arrangement [Domain] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Share-based compensation, intrinsic value, vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Temporary equity, liquidation preference per share (in dollars per share) Temporary Equity, Liquidation Preference Per Share Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Registrant Name Entity Registrant Name Oil and Gas, Capitalized Cost Oil and Gas, Capitalized Cost [Table Text Block] Net income (loss) before income tax expense (benefit) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Redeemable Non-controlling Interest Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Effect of the reorganization transaction Stock Issued During Period, Value, Effect Of Reorganization Items Stock Issued During Period, Value, Effect Of Reorganization Items Executive Category: Executive Category [Axis] Propane Fixed Price Swap 2026 Propane Fixed Price Swap 2026 [Member] Propane Fixed Price Swap 2026 Less: accumulated depreciation, depletion, and amortization Oil and Gas, Capitalized Cost, Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance Equity award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Counterparty Name [Axis] Counterparty Name [Axis] Furniture, fixtures, and office equipment Furniture and Fixtures [Member] Total liabilities, stockholders’ equity, redeemable interest and Series A Preferred Stock Liabilities and Equity [Abstract] Series A Preferred Stock ($0.01 par value; 350,000 and 0 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively) Temporary equity beginning balance Temporary equity ending balance Temporary equity attributable to parent Temporary Equity, Carrying Amount, Attributable to Parent Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] PEO Name PEO Name Debt instrument, convertible, threshold percentage of stock price (as percent) Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Leasehold improvements Leasehold Improvements [Member] Temporary equity issued (in shares) Temporary Equity, Shares Issued Oil and Gas, Delivery Commitment [Line Items] Oil and Gas, Delivery Commitment [Line Items] Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Legal Entity [Axis] Legal Entity [Axis] Interest expense, debt Interest Expense, Debt RSUs repurchased for tax withholdings (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Capitalized cost excluded from amortization Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Additions to oil and gas properties in accounts payable and accrued liabilities Additions To Oil And Gas Properties Included In Accounts Payable Additions To Oil And Gas Properties Included In Accounts Payable Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Temporary equity, stock issued during period (in shares) Temporary Equity, Stock Issued During Period, Shares, New Issues Temporary Equity, Stock Issued During Period, Shares, New Issues Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Average depletion rate (in USD per BOE) Depletion Of Oil And Gas Properties, Average Depletion Rate, Per Barrel Of Oil Equivalent Depletion Of Oil And Gas Properties, Average Depletion Rate, Per Barrel Of Oil Equivalent Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Production and ad valorem taxes Utilities Operating Expense, Taxes Capitalized interest Interest Paid, Capitalized, Investing Activity Preferred stock, redemption, internal rate of return Preferred Stock, Redemption, Internal Rate Of Return Preferred Stock, Redemption, Internal Rate Of Return Transportation Optimization Activities Transportation Optimization Activities [Policy Text Block] Transportation Optimization Activities Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Net income (loss) attributable to Infinity Natural Resources, Inc.—basic (in dollars per share) Net income (loss) available to Class A common stockholders per share - basic (in dollars per share) Earnings Per Share, Basic Repurchases of Class A common stock Payments for Repurchase of Common Stock Oil Options Price Oil Options Price [Member] Oil Options Price Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Schedule of Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Award Type Award Type [Axis] Oil Options Price 2027 Oil Options Price 2027 [Member] Oil Options Price 2027 Proved properties Oil and Gas, Capitalized Cost, before Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance, Proved Property Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Oil and natural gas sales, net Accounts Receivable, after Allowance for Credit Loss, Current Pentane Fixed Price Swap 2026 Pentane Fixed Price Swap 2026 [Member] Pentane Fixed Price Swap 2026 Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Natural Gas Basis Swap 2026 Natural Gas Basis Swap 2026 [Member] Natural Gas Basis Swap 2026 Change in Tax Receivable Agreement Adjustments to Additional Paid in Capital, Increase In Tax Receivable Agreement Liability Or Establishment Of Liabilities Under The Tax Receivable Agreement Adjustments to Additional Paid in Capital, Increase In Tax Receivable Agreement Liability Or Establishment Of Liabilities Under The Tax Receivable Agreement Product and Service [Axis] Product and Service [Axis] Credit Facility Credit Facility [Member] Credit Facility Debt instrument, convertible, threshold trading days Debt Instrument, Convertible, Threshold Trading Days Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Dividends on Series A Preferred Stock Increase in Carrying Amount of Redeemable Preferred Stock Normal Butane Fixed Price Swap 2027 Normal Butane Fixed Price Swap 2027 [Member] Normal Butane Fixed Price Swap 2027 Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Transportation Transportation [Member] Transportation Derivative Contract [Domain] Derivative Contract [Domain] Oil and natural gas properties, net Oil and Gas, Capitalized Cost, after Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance Equity Awards Adjustments Equity Awards Adjustments [Member] Pentane Fixed Price Swap 2027 Pentane Fixed Price Swap 2027 [Member] Pentane Fixed Price Swap 2027 Asset Acquisition [Line Items] Asset Acquisition [Line Items] Total liabilities, stockholders’ equity, redeemable interest and Series A Preferred Stock Liabilities and Equity Commodity derivative liabilities Derivative Liability, Noncurrent Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Oil Fixed Price Swap 2026 Oil Fixed Price Swap 2026 [Member] Oil Fixed Price Swap 2026 Proceeds from issuance of Series A Preferred Stock Proceeds from Issuance of Preferred Stock and Preference Stock Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other income (expense) Other Nonoperating Income (Expense) Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Canceled/forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Revenues Asset Acquisition, Pro Forma Information, Pro Forma Revenue Asset Acquisition, Pro Forma Information, Pro Forma Revenue General and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Basic net income (loss) per share (in dollars per share) Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax, Per Basic Share Asset Acquisition, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax, Per Basic Share Oil and Gas, Delivery Commitment [Table] Oil and Gas, Delivery Commitment [Table] Schedule of Valuation Assumptions for PSUs Schedule Of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] Schedule Of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Property and equipment, net Property, Plant, Equipment, Oil, And Natural Gas, Net Property, Plant, Equipment, Oil, And Natural Gas, Net Adjustment to Compensation: Adjustment to Compensation [Axis] Net income (loss) attributable to redeemable non-controlling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Isobutane Fixed Price Swap Isobutane Fixed Price Swap [Member] Isobutane Fixed Price Swap Asset retirement obligations Asset Acquisition, Asset Retirement Obligations Asset Acquisition, Asset Retirement Obligations Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Natural Gas Basis Swap 2027 Natural Gas Basis Swap 2027 [Member] Natural Gas Basis Swap 2027 Hedging Designation [Axis] Hedging Designation [Axis] Net loss subsequent to reorganization transactions Net Income (Loss) Attributable To Parent, Subsequent To Reorganization Net Income (Loss) Attributable To Parent, Subsequent To Reorganization Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Oil Options Price 2026 Oil Options Price 2026 [Member] Oil Options Price 2026 Name Measure Name Amended And Restated Credit Facility Amended And Restated Credit Facility [Member] Amended And Restated Credit Facility Income Taxes and Tax Receivable Agreement Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Realized gain (loss) on derivative instruments Gain (Loss) on Sale of Derivatives Additional Paid in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental Cash Flow Elements [Abstract] Midstream and other revenues Midstream And Other Revenues [Member] Midstream And Other Revenues Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Issuance costs in accrued liabilities Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Lease operating Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Depreciation, depletion, and amortization Depreciation, Depletion and Amortization Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Natural Gas Fixed Price Swap 2026 Natural Gas Fixed Price Swap 2026 [Member] Natural Gas Fixed Price Swap 2026 Stock, Class of Stock [Table] Stock, Class of Stock [Table] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Derivative liability Derivative Liability Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Vested and settled (in dollars per share) Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Income tax expense (benefit) Income Tax Expense (Benefit) Payments of Notes debt issuance costs Payments of Loan Costs Royalties payable Asset Acquisition, Royalties Payable Asset Acquisition, Royalties Payable Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Natural Gas Basis Swap 2028 Natural Gas Basis Swap 2028 [Member] Natural Gas Basis Swap 2028 Award Timing Method Award Timing Method [Text Block] Exchange ratio Common Stock, Exchange Rate Common Stock, Exchange Rate Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income (loss) attributable to Infinity Natural Resources, Inc. Net income (loss) Net income (loss) attributable to Infinity Natural Resources, Inc. Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Unamortized debt issuance costs Unamortized Debt Issuance Expense Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Natural Gas Fixed Price Swap 2027 Natural Gas Fixed Price Swap 2027 [Member] Natural Gas Fixed Price Swap 2027 Gross midstream and other property and equipment Oil and Gas Properties [Member] Restatement Determination Date: Restatement Determination Date [Axis] Gathering, processing, and transportation Oil and Gas, Result of Operation, Production Cost Pentane Pentane [Member] Pentane Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Debt instrument, convertible, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Gross Amounts Derivative Asset, Subject to Master Netting Arrangement, before Offset Net income attributable to Infinity Natural Resources, LLC prior to the reorganization Net income prior to reorganization transactions Net Income (Loss) Attributable To Parent, Prior To Reorganization Net Income (Loss) Attributable To Parent, Prior To Reorganization Revenues: Revenues [Abstract] Legacy Owners Legacy Owners [Member] Legacy Owners Temporary equity, stock issued during period, value, price (in dollars per share) Temporary Equity, Stock Issued During Period, Value, New Issues, Price Per Share Temporary Equity, Stock Issued During Period, Value, New Issues, Price Per Share Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]