Significant Accounting Policies (Policies) |
9 Months Ended |
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Sep. 30, 2026 | |
| Accounting Policies [Abstract] | |
| Consolidation, Policy [Policy Text Block] | Principles of Consolidation and Reporting
The accompanying unaudited Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. These financial statements should be read in conjunction with the financial statements for the year ended December 31, 2025, and notes thereto included in the Partnership's Annual Report on Form 10-K, which was filed with the SEC on February 27, 2026. Reclassifications have been made to prior year amounts in the Consolidated Financial Statements to conform with current year presentation. These reclassifications had no impact on previously reported total assets, total liabilities, partners' capital, net income, or cash flows from operating, investing or financing activities.
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| New Accounting Pronouncements, Policy [Policy Text Block] | Recently Issued Accounting Standard
In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures ("ASU 2024-03"). ASU 2024-03 is intended to improve disclosures about a public business entity's expenses and provide more detailed information to investors about the types of expenses in commonly presented expense captions. The guidance is effective for annual periods beginning after December 15, 2026, and quarterly periods beginning after December 31, 2027, and can be adopted prospectively to financial statements issued for reporting periods after the effective date or retrospectively to all prior periods presented in the financial statements. NRP does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements.
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