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Consolidated Statements of Partners' Capital (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Allocation to unitholders | $ 4,248 | $ 16,719 | $ 30,000
Allocation to unitholders | $ 4,248 | $ 16,719 | $ 30,000

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- Definition Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest, Allocated to Preferred Unit Holders + References No definition available. + Details
Name: | nrp_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestAllocatedToPreferredUnitHolders
Namespace Prefix: | nrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration