Document And Entity Information Contract with customer, current us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossCurrent Note To Financial Statement Details Textual Contract with customer, noncurrent us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent Note 2 - Revenues from Contracts with Customers Note 3 - Common Unit Distributions ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 4 - Net Income Per Common Unit ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 5 - Segment Information Trading Arrangements, by Individual [Table] Note 6 - Equity Investment Material Terms of Trading Arrangement [Text Block] Note 7 - Mineral Rights, Net Note 8 - Debt, Net Note 9 - Fair Value Measurements Note 10 - Related Party Transactions Note 11 - Major Customers Note 13 - Unit-Based Compensation Note 14 - Credit Losses Note 2 - Revenues from Contracts with Customers - Disaggregation of Revenue (Details) Note 2 - Revenues from Contracts with Customers - Assets and Liabilities (Details) Note 2 - Revenues from Contracts with Customers - Operating Lease Payments Receivable (Details) Equity in earnings (loss) of Sisecam Wyoming Equity in (earnings) loss from unconsolidated investment Equity in earnings of Sisecam Wyoming Note 3 - Common Unit Distributions - Distributions Made to Partners (Details) Note 4 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details) us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Note 5 - Segment Information - Information By Segment (Details) Note 6 - Equity Investment - Investment Activity (Details) Note 7 - Mineral Rights, Net - Composition of Mineral Rights (Details) Note 8 - Debt, Net - Schedule of Long-term Debt (Details) Note 8 - Debt, Net - Schedule of Long-term Debt (Details) (Parentheticals) Note 9 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) Note 10 - Related Party Transactions - General Partner Affiliates (Details) Note 11 - Major Customers - Concentration Risk (Details) Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Note 13 - Unit-Based Compensation - Share-based Compensation Activity (Details) Basis of Presentation and Significant Accounting Policies [Text Block] Note 14 - Credit Losses - Allowance for Credit Losses (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Counterparty Name [Axis] us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Land Counterparty Name [Domain] us-gaap_IncreaseDecreaseInInterestPayableNet Accrued interest Segment Reporting [Text Block] Award Type [Axis] Segment Reporting [Table Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Carbon Neutral Revenues [Member] Relating to carbon neutral revenues. us-gaap_Liabilities Total liabilities us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Consolidation Items [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and partners' capital Segment Reporting [Table] nrp_DebtInstrumentCovenantMaximumLeverageRatio Debt Instrument Covenant Maximum Leverage Ratio The debt instrument covenant requirement representing the company's maximum leverage ratio. Unit-based compensation expense Share-Based Payment Arrangement, Noncash Expense Subsequent Event [Member] Weighted average common units—basic (in shares) us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding Opco [Member] Represents Opco. Consolidation Items [Domain] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Domain] Senior Notes [Member] Share-Based Payment Arrangement [Text Block] Lease Contractual Term [Axis] Lease Contractual Term [Domain] Change in operating assets and liabilities: us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable Portion at Fair Value Measurement [Member] Five Point Zero Three Percent Senior Note Due December Two Zero Two Six [Member] The 5.03% senior note, semi-annual interest payments in June and December, with annual principal payments in December, due December 2026. Five Point One Eight Percent Senior Note Due December Two Zero Two Six [Member] The 5.18% senior note, semi-annual interest payments in June and December, with annual principal payments in December, due December 2026. Reported Value Measurement [Member] us-gaap_IncreaseDecreaseInAccruedLiabilities Accrued liabilities us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash and cash equivalents nrp_DiscountRate Discount Rate The percentage rate used to present value future cash flow projections. Estimate of Fair Value Measurement [Member] Common unitholders interest, outstanding (in shares) Common unitholders interest, issued (in shares) Opco Senior Notes [Member] Represents the Opco senior notes. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Statement [Table] Common unitholders’ interest (13,250,412 and 13,138,097 units issued and outstanding at March 31, 2026 and December 31, 2025, respectively) General and administrative expenses nrp_GeneralAndAdministrativeExpenseIncludingAffiliates The amount of general and administrative expenses incurred during the reporting period, including affiliates. us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted Weighted average common units—diluted (in shares) Foresight Energy Resources [Member] Represents Foresight Energy Resources, LLC. Equity in unconsolidated investment Beginning Balance Ending Balance Alpha Metallurgical Resources [Member] Represents Alpha Metallurgical Resources, Inc. nrp_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value The fair value of grants made during the period on other than stock option plans. QMC and WPPLP and QID [Member] Represents Quintana Minerals Corporation (QMC), Western Pocahontas Properties Limited Partnership (WPPLP), and Quintana Infrastructure Development (QID). Line of Credit Facility, Lender [Domain] us-gaap_EquityMethodInvestmentOwnershipPercentage Equity Method Investment, Ownership Percentage us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Outstanding (in shares) Outstanding (in shares) nrp_CECLAllowanceTotal Total, allowance The total amount of current expected credit loss (CECL) allowance at the reporting date. Lender Name [Axis] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Outstanding, weighted average grant date fair value (in dollars per share) Outstanding, weighted average grant date fair value (in dollars per share) Receivables, net The amount of short-term receivables, net of CECL allowance, at the reporting date. us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity Line of Credit Facility, Remaining Borrowing Capacity Granted (in shares) Total, net The amount of total receivables, net of CECL allowance, at the reporting date. Granted, weighted average grant date fair value (in dollars per share) Long-Term Debt, Type [Axis] Total, gross nrp_TotalReceivablesGross The amount of total gross receivables at the reporting date. Receivables, gross nrp_ShorttermReceivablesGross The amount of gross short-term receivables at the reporting date. Product and Service [Domain] Product and Service [Axis] Ownership [Axis] us-gaap_LineOfCredit Long-Term Line of Credit Ownership [Domain] Fully vested and issued, weighted average grant date fair value (in dollars per share) us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Fully vested and issued (in shares) Commitments and Contingencies Disclosure [Text Block] Statement [Line Items] us-gaap_LongTermDebtWeightedAverageInterestRateOverTime Long-Term Debt, Weighted Average Interest Rate, over Time Fair Value Hierarchy and NAV [Axis] Award Type [Domain] Annual minimum payments Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Accounts payable Accounts Payable, Current us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables us-gaap_ProceedsFromLinesOfCredit Proceeds from Lines of Credit Partner, General [Member] Represents general partner party to a partnership business who has unlimited liability. Concentration Risk [Table] Subsequent Events [Text Block] Concentration Risk Type [Axis] Accrued liabilities Debt borrowings Concentration Risk Disclosure [Text Block] us-gaap_OperatingLeaseLiability Operating Lease, Liability Schedule of Related Party Transactions [Table Text Block] Accrued interest Proceeds from asset sales and disposals Current portion of debt, net Less: current portion of debt Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Concentration Risk Type [Domain] Total long-term debt, net Long-term debt, net Long-term contract receivable, net Class of Warrant or Right [Table] us-gaap_LongTermDebt Total debt, net WPPLP [Member] Represents the WPPLP member. Loss Contingencies [Table] Statement of Partners' Capital [Abstract] New Lender [Member] Represents the new lender for the debt agreement. Statement of Cash Flows [Abstract] Other comprehensive income (loss) Long-Term Debt, Type [Domain] Equity Components [Axis] Equity Component [Domain] Fair Value, Inputs, Level 3 [Member] AOCI Attributable to Parent [Member] Lease Term, 0 to 5 Years [Member] Represents the lease term from 0 to five years. Lease Term, 5 to 10 Years [Member] Represents the lease term from five to ten years. Subsequent Event Type [Domain] Bad debt expense Subsequent Event [Table] us-gaap_RealEstateTaxExpense Property taxes Subsequent Event Type [Axis] Lease Term, Greater Than 10 Years [Member] Represents lease term greater than ten years. Net income per common unit (see Note 4) us-gaap_ProvisionForLoanLossesExpensed Financing Receivable, Credit Loss, Expense (Reversal) Floating Rate Revolving Credit Facility Due October 2029 [Member] Represents Floating Rate Revolving Credit Facility Due October 2029. Net income attributable to the general partner Net income attributable to common unitholders Net income attributable to common unitholders Fair Value Option, Disclosures [Table Text Block] March 2026 Special Distribution [Member] March 2026 Special Distribution Fair Value Disclosures [Text Block] Supplemental cash flow information: Current liabilities us-gaap_LiabilitiesCurrent Total current liabilities Alabama Kanu Holdings [Member] In relation to Alabama Kanu Holdings. Accounts receivable, net Accounts receivable, net Long term debt, fair value Customer Concentration Risk [Member] us-gaap_SalariesWagesAndOfficersCompensation Compensation (salaries, benefits and bonus) Gain (loss) on asset sales and disposals Loss (gain) on asset sales and disposals Gain on asset sales and disposals us-gaap_PaymentsToAcquireEquityMethodInvestments Payments to Acquire Equity Method Investments Capital to unconsolidated investment Revenue Benchmark [Member] Accumulated other comprehensive loss Mineral Properties, carrying value Mineral Properties, net book value Mineral rights, net General and administrative expenses Debt Disclosure [Text Block] Other current assets, net us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Debt instrument, carrying value us-gaap_DebtInstrumentCarryingAmount Long-Term Debt, Gross Mineral Industries Disclosures [Text Block] Partners’ capital Amortization of debt issuance costs and other Current assets General partner’s interest us-gaap_AssetsCurrent Total current assets Gross profit (loss) Credit Loss, Financial Instrument [Text Block] us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest Balance Balance Debt Instrument, Name [Domain] us-gaap_EmployeeBenefitsAndShareBasedCompensation Long-term incentive compensation (1) Fair Value Measurement Inputs and Valuation Techniques [Table] Debt instrument, interest rate Distributions from unconsolidated investment Related and Nonrelated Parties [Axis] Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Axis] nrp_NumberOfWhollyOwnedOperatingCompanies Number of Wholly Owned Operating Companies Represents the number of wholly owned operating companies. Cash flows from operating activities Cash flows from investing activities nrp_DebtInstrumentCovenantMinimumInterestCoverageRatio Debt Instrument, Covenant, Minimum Interest Coverage Ratio The minimum interest coverage ratio under the covenant of the debt instrument. us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Cash flows from financing activities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash provided by (used in) investing activities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by (used in) financing activities Common Units [Member] Represents common units. Accounts Receivable, Allowance for Credit Loss [Table Text Block] Share-Based Payment Arrangement, Activity [Table Text Block] Operating Segments [Member] Accounting Policies [Abstract] Segments [Domain] us-gaap_CashDividendsPaidToParentCompanyByUnconsolidatedSubsidiaries Distributions Segments [Axis] us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit Distribution Made to Limited Partner, Distributions Declared, Per Unit (in dollars per share) Income Statement [Abstract] us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid Distributions to unitholders Diluted net income attributable to common unitholders us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Distribution per unit, common units (in dollars per share) Market-based Awards [Member] Related to market-based awards. us-gaap_CostsAndExpenses Total operating expenses us-gaap_DeferredRevenueRevenueRecognized1 Recognition of previously deferred revenue Accounting Standards Update and Change in Accounting Principle [Table] Distributions Made to Limited Partner, by Distribution [Table Text Block] Asset impairments Asset impairments Related and Nonrelated Parties [Domain] us-gaap_DeferredFinanceCostsNet Net unamortized debt issuance costs Related Party Transaction [Table] Related Party Transactions Disclosure [Text Block] Contract receivable, net (current and long-term) Measurement Basis [Axis] Fair Value Hierarchy and NAV [Domain] us-gaap_MineralPropertiesAccumulatedDepletion Mineral Properties, accumulated depletion Return of long-term contract receivable us-gaap_RepaymentsOfLongTermDebt Debt repayments us-gaap_RepaymentsOfLinesOfCredit Repayments of Lines of Credit Statement of Financial Position [Abstract] Other long-term assets, net us-gaap_OtherAssetsNoncurrent Other Assets, Noncurrent us-gaap_IncreaseDecreaseInDeferredRevenue Deferred revenue us-gaap_DeferredRevenue Balance Balance Document Type Operating expenses Document Information [Line Items] Document Quarterly Report Revenue, percent Weighted average remaining years (Year) Deferred revenue Document Information [Table] Current portion of deferred revenue Entity Interactive Data Current Document Transition Report nrp_RevenuesExcludingGainOnSaleOfAsset Revenues Amount of revenues excluding the gain on sale of asset. Antidilutive Security, Excluded EPS Calculation [Table] March 2025 Special Distribution [Member] Represents March 2025 special distribution. Intangible assets, net Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus Investment, Name [Domain] Amendment Flag Minimum Lease Straight-line Revenues [Member] Related to minimum lease straight-line revenue. us-gaap_DebtInstrumentCollateralAmount Debt Instrument, Collateral Amount Document Period End Date General Partner [Member] Limited Partner [Member] Long-Lived Asset, Class [Domain] Legal Entity [Axis] Financing Receivable, Allowance for Credit Loss [Table] Entity File Number Entity Tax Identification Number Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Filer Category Entity Shell Company Entity Emerging Growth Company Comprehensive loss from unconsolidated investment and other Comprehensive income (loss) from unconsolidated investment and other Entity Small Business us-gaap_OperatingIncomeLoss Income from operations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss Long-term contract receivable, allowance Long-term contract receivable, gross us-gaap_ContractWithCustomerAssetGross us-gaap_SegmentReportingOtherItemAmount Other segment items (3) Net sales Revenues Revenues and other income Operating and maintenance expenses Entity Address, State or Province Entity Address, City or Town us-gaap_InterestExpenseNonoperating Interest expense, net Interest expense, net (2) Entity Address, Address Line One us-gaap_InterestIncomeOperatingAndNonoperating Interest Income, Operating and Nonoperating City Area Code us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Other items, net us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Payment, Tax Withholding, Share-Based Payment Arrangement Local Phone Number Revenue from Contract with Customer [Text Block] Entity Address, Postal Zip Code Equity Method Investment [Table] Title of 12(b) Security Security Exchange Name Trading Symbol Class of Stock [Axis] Entity Common Stock, Shares Outstanding Earnings Per Share [Text Block] nrp_RevenueNetIncludingGainLossOnDispositionOfAssets Total revenues and other income Total revenues and other income Revenue, Net, Including Gain (Loss) on Disposition of Assets Mineral Rights Segment [Member] Represents mineral rights segment. us-gaap_OtherAssetsCurrent Other Assets, Current Soda Ash Segment [Member] Represents soda ash segment member. Affiliated Entity [Member] Royalty and Other Mineral Rights [Member] Represents information related to royalty and other mineral rights. Transportation and Processing Services [Member] Represents information related to transportation and processing services. Coal Royalty Revenues [Member] Represents coal royalty revenues. Production Lease Minimum Revenues [Member] Represents production lease minimum revenues. Unit-based awards amortization and vesting, net The amount of amortization for partners' capital account unit-based compensation. Net income Net income Property Tax Revenues [Member] Represents property tax revenues. Wheelage Revenues [Member] Represents wheelage revenues. Coal Overriding Royalty Revenues [Member] Represents coal overriding royalty revenues. Lease Amendment Revenues [Member] Represents lease amendment revenues. Other Revenues [Member] Represents other revenues. Property, Plant, and Equipment [Table] Aggregates Royalty Revenues [Member] Represents aggregates royalty revenues. Oil and Gas Royalty Revenues [Member] Represents oil and gas royalty revenues. Investment, Name [Axis] Increase due to minimums and lease amendment fees The amount of deferred revenue contractual minimum payments during the reporting period. us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other items, net Long-Lived Asset, Class [Axis] us-gaap_Assets Total assets Total assets Common Unitholders, General Partner [Member] Common unitholders and general partner. Cash and cash equivalents us-gaap_AllowanceForDoubtfulAccountsReceivable Receivables, allowance us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest Net income (loss) Long-term contract receivable, net us-gaap_NontradeReceivablesNoncurrent Nontrade Receivables, Noncurrent Plus: dilutive effect of unvested unit-based awards (in shares) nrp_WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectOfUnitAwards Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment, Effect of Unit Awards Customer [Axis] Equity Method Investments and Joint Ventures Disclosure [Text Block] Depreciation, depletion and amortization Depreciation, Depletion and Amortization Equity Method Investments [Table Text Block] Income (loss) allocation to NRP’s equity interests (1) The amount of Income (Loss) from Equity Method Investments, Allocated Amount before Basis Difference Amortization Amortization of basis difference The amount of amortization of equity method investment difference between carrying amount and underlying equity. Diluted net income attributable to common unitholders and the general partner nrp_NetIncomeLossAllocatedToGeneralPartnersAndLimitedPartnersDiluted The amount of Net Income (Loss) Allocated to General Partners and Limited Partners, Diluted Less: diluted net income attributable to the general partner nrp_IncomeLossAttributableToParentAndOtherIncomeFromWarrantLiabilityFairValueAdjustmentsAllocatedToGeneralPartner The amount of income (Loss) Attributable to Parent and Other Income from Warrant Liability Fair Value Adjustments Allocated to General Partner Sisecam Wyoming [Member] Represents Sisecam Wyoming. Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Partner Type [Axis] Diluted net income per common unit (in dollars per share) Diluted (in dollars per share) us-gaap_PartnersCapital Total partners’ capital Cash paid for interest Basic net income per common unit (in dollars per share) Basic (in dollars per share) Oil and Gas Royalty Properties [Member] Represents oil and gas royalty properties. Schedule of Long-Term Debt Instruments [Table Text Block] Other [Member] Represents other. Issuance of unit-based awards (in shares) Distributions, common units Distributions to common unitholders and the general partner Mineral Properties Disclosure [Table Text Block] The entire tabular disclosure for mineral properties. us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest Comprehensive income Partner Capital Components [Axis] Coal Properties [Member] Represents coal properties. Capital contribution Aggregates Properties [Member] Represents aggregates properties. Partner Capital Components [Domain] Partner Type of Partners' Capital Account, Name [Domain] us-gaap_PartnersCapitalAccountUnits Balance (in shares) Balance (in shares) Partners' Capital Notes Disclosure [Text Block] us-gaap_OperatingCostsAndExpenses Operating Costs and Expenses nrp_CashCompensation Cash Compensation The amount of cash compensation. Distribution Type [Domain] Distribution Type [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] us-gaap_OperatingLeaseRightOfUseAsset Operating Lease, Right-of-Use Asset Corporate & Financing Segment [Member] Represents information pertaining to the corporate and financing segment. Other non-current liabilities us-gaap_OtherLiabilitiesNoncurrent ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Revenue from contract with customers ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Commitments and contingencies (see Note 12)