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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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