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Debt and Debt - Affiliate - Long-Term Debt (Detail) - USD ($) | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Oct. 31, 2014 | Sep. 30, 2013
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 1,384,996,000 |  | $ 1,475,223,000 |  |
Less - current portion of long term debt | (80,983,000) |  | (80,983,000) |  |
Long-term debt, net | $ 1,304,013,000 |  | 1,394,240,000 |  |
Rate of senior notes | 9.125% |  |  |  |
NRP LP |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate revolving credit facility |  |  |  | $ 125,000,000 | $ 300,000,000.0
Senior Note issue percentage |  |  |  | 99.50% | 99.007%
Rate of senior notes |  |  |  | 9.125% | 9.125%
NRP LP | 9.125% senior notes, with semi-annual interest payments in April and October, maturing October 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 422,923,000 |  | 422,167,000 |  |
Debt Instrument, face Amount | $ 425,000,000 |  |  |  |
Rate of senior notes | 9.125% |  |  |  |
Opco | $300 million floating rate revolving credit facility, due October 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 290,000,000 |  | 0 |  |
Floating rate revolving credit facility | 300,000,000 | $ 300,000,000.0 |  |  |
Opco | $300 million floating rate revolving credit facility, due August 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | 0 |  | 200,000,000 |  |
Floating rate revolving credit facility | 300,000,000 | $ 300,000,000.0 |  |  |
Opco | $200 million floating rate term loan, due January 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | 0 |  | 75,000,000 |  |
Floating rate revolving credit facility | 200,000,000 |  |  |  |
Opco | 4.91% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 13,850,000 |  | 18,467,000 |  |
Rate of senior notes | 4.91% |  |  |  |
Opco | 8.38% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 85,714,000 |  | 107,143,000 |  |
Rate of senior notes | 8.38% |  |  |  |
Opco | 5.05% senior notes, with semi-annual interest payments in January and July, with annual principal payments in July, maturing in July 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 38,462,000 |  | 46,154,000 |  |
Rate of senior notes | 5.05% |  |  |  |
Opco | 5.31% utility local improvement obligation, with annual principal and interest payments, maturing in March 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 1,153,000 |  | 1,345,000 |  |
Rate of senior notes | 5.31% |  |  |  |
Opco | 5.55% senior notes, with semi-annual interest payments in June and December, with annual principal payments in June, maturing in June 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 21,600,000 |  | 24,300,000 |  |
Rate of senior notes | 5.55% |  |  |  |
Opco | 4.73% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 60,000,000 |  | 67,500,000 |  |
Rate of senior notes | 4.73% |  |  |  |
Opco | 5.82% senior notes, with semi-annual interest payments in March and September, with annual principal payments in March, maturing in March 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 135,000,000 |  | 150,000,000 |  |
Rate of senior notes | 5.82% |  |  |  |
Opco | 8.92% senior notes, with semi-annual interest payments in March and September, with scheduled principal payments beginning March 2014, maturing in March 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 40,909,000 |  | 45,455,000 |  |
Rate of senior notes | 8.92% |  |  |  |
Opco | 5.03% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 148,077,000 |  | 161,538,000 |  |
Rate of senior notes | 5.03% |  |  |  |
Opco | 5.18% senior notes, with semi-annual interest payments in June and December, with scheduled principal payments beginning December 2014, maturing in December 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 42,308,000 |  | 46,154,000 |  |
Rate of senior notes | 5.18% |  |  |  |
NRP Oil and Gas | Reserve Based Revolving Credit Facility Due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 85,000,000 |  | $ 110,000,000 |  |
Senior Notes Offering Price Two [Member] | NRP LP | 9.125% senior notes, with semi-annual interest payments in April and October, maturing October 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate revolving credit facility | $ 125,000,000 |  |  |  |
Senior Note issue percentage | 99.50% |  |  |  |
Senior Notes Offering Price One [Member] | NRP LP | 9.125% senior notes, with semi-annual interest payments in April and October, maturing October 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate revolving credit facility | $ 300,000,000 |  |  |  |
Senior Note issue percentage | 99.007% |  |  |  |

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