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Fair Value Measurements - Contractual Override, Note Receivable and Long-Term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Contracts receivable—affiliate, current and long-term | $ 4,891 | $ 4,870
Fair Value, Inputs, Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Contracts receivable—affiliate, current and long-term | 4,158 | 5,162
Nrp Lp Senior Notes [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Amount | 422,923 | 422,167
Estimated Fair Value | 277,313 | 423,780
Opco Senior Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Amount | 587,073 | 668,056
Estimated Fair Value | 383,065 | 672,740
Opco Revolving Credit Facility And Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Amount | 290,000 | 275,000
Estimated Fair Value | 290,000 | 275,000
Nrp Oil And Gas Revolving Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Carrying Amount | 85,000 | 110,000
Estimated Fair Value | $ 85,000 | $ 110,000

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- Definition Contracts Receivable, Related Party, Fair Value Disclosure + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Details
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- Details
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