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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Extractive Industries [Abstract]
Estimated proved reserves (percent)	100.00%	100.00%

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- Definition

Estimates Of Proved Reserves Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	nrp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_ExtractiveIndustriesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration