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CRUDE OIL AND NATURAL GAS PROPERTIES (Details) (USD $)
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12 Months Ended | 3 Months Ended | |||
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Dec. 31, 2014
acre
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Dec. 31, 2013
acre
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Dec. 31, 2012
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Dec. 31, 2012
acre
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Dec. 31, 2011
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| Acquisitions [Abstract] | |||||
| Capital expenditures incurred but not yet paid | $ 221,000,000us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 163,000,000us-gaap_CapitalExpendituresIncurredButNotYetPaid | |||
| Divestitures [Abstract] | |||||
| Proceeds from sale of oil and gas properties | 0us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment | 908,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment | 0us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment | ||
| Unproved Properties [Abstract] | |||||
| Unproven leasehold interests (in net acres) | 55,743nog_UnprovenLeaseholdInterests | 60,600nog_UnprovenLeaseholdInterests | |||
| Anticipated future period over which excluded costs will become subject to depletion | 5 years | ||||
| Impairment costs related to expired leases subject to depletion | 21,400,000nog_ImpairmentCostsRelatedToExpiredLeasesSubjectToDepletion | 5,100,000nog_ImpairmentCostsRelatedToExpiredLeasesSubjectToDepletion | 0nog_ImpairmentCostsRelatedToExpiredLeasesSubjectToDepletion | ||
| Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost [Abstract] | |||||
| Property Acquisition | 23,919,268us-gaap_AcquisitionCosts | 13,085,405us-gaap_AcquisitionCosts | 3,356,715us-gaap_AcquisitionCosts | ||
| Development | 0us-gaap_DevelopmentCosts | 0us-gaap_DevelopmentCosts | 0us-gaap_DevelopmentCosts | ||
| Total | 23,919,268us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization | 13,085,405us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization | 3,356,715us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization | ||
| Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative [Abstract] | |||||
| Property Acquisition, Cumulative | 10,281,045us-gaap_AcquisitionCostsCumulative | ||||
| Development, Cumulative | 0us-gaap_DevelopmentCostsCumulative | ||||
| Total, Cumulative | 10,281,045us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative | ||||
| 2012 Acquisitions [Member] | |||||
| Acquisitions [Abstract] | |||||
| Mineral acres acquired, net (in acres) |
17,590nog_GasAndOilAcreageNetAcresAcquired / nog_AcquisitionsByYearAxis = nog_AcquisitionsMember |
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| Average acquisition cost per net acre |
1,788nog_AverageAcquisitionCostPerNetAcre / nog_AcquisitionsByYearAxis = nog_AcquisitionsMember |
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| Number of acres earned through farm-in arrangements (in acres) |
6,450nog_NumberOfAcresEarnedThroughFarmInArrangements / nog_AcquisitionsByYearAxis = nog_AcquisitionsMember |
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| 2013 Acquisitions [Member] | |||||
| Acquisitions [Abstract] | |||||
| Mineral acres acquired, net (in acres) |
20,900nog_GasAndOilAcreageNetAcresAcquired / nog_AcquisitionsByYearAxis = nog_Year2013Member |
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| Average acquisition cost per net acre |
1,279nog_AverageAcquisitionCostPerNetAcre / nog_AcquisitionsByYearAxis = nog_Year2013Member |
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| Productive oil and gas wells number of wells gross |
70nog_ProductiveOilAndGasWellsNumberOfWellsGross / nog_AcquisitionsByYearAxis = nog_Year2013Member |
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| Productive oil and gas wells number of wells net |
7.0nog_ProductiveOilAndGasWellsNumberOfWellsNet / nog_AcquisitionsByYearAxis = nog_Year2013Member |
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| Productive Oil and Gas Wells, Cost |
9,000,000nog_ProductiveOilAndGasWellsCost / nog_AcquisitionsByYearAxis = nog_Year2013Member |
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| 2014 Acquisitions [Member] | |||||
| Acquisitions [Abstract] | |||||
| Mineral acres acquired, net (in acres) |
22,668nog_GasAndOilAcreageNetAcresAcquired / nog_AcquisitionsByYearAxis = nog_Year2014Member |
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| Average acquisition cost per net acre |
1,534nog_AverageAcquisitionCostPerNetAcre / nog_AcquisitionsByYearAxis = nog_Year2014Member |
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| Productive oil and gas wells number of wells gross |
125nog_ProductiveOilAndGasWellsNumberOfWellsGross / nog_AcquisitionsByYearAxis = nog_Year2014Member |
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| Productive oil and gas wells number of wells net |
10.3nog_ProductiveOilAndGasWellsNumberOfWellsNet / nog_AcquisitionsByYearAxis = nog_Year2014Member |
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| Productive Oil and Gas Wells, Cost |
10,600,000nog_ProductiveOilAndGasWellsCost / nog_AcquisitionsByYearAxis = nog_Year2014Member |
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| North Dakota and Montana Properties [Member] | |||||
| Divestitures [Abstract] | |||||
| Proceeds from sale of oil and gas properties |
$ 900,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment / dei_LegalEntityAxis = nog_NorthDakotaAndMontanaPropertiesMember |
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| Gas and Oil acreage, net acres sold |
835nog_GasAndOilAcreageNetAcresSold / dei_LegalEntityAxis = nog_NorthDakotaAndMontanaPropertiesMember |
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| X | ||||||||||
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- Definition
The anticipated timing of the inclusion of the costs in the amortization computation. No definition available.
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- Definition
Average cost of acquisition per net acre. No definition available.
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- Details
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- Definition
Net mineral acres acquired is the sum of the fractional interest purchased during the period based on working interests or other economic arrangements. No definition available.
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- Definition
Net mineral acres sold during the period. No definition available.
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- Definition
Impairment costs related to expired leases which are included in the depletion calculation. No definition available.
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- Definition
Number of acres earned through farm-in arrangements. No definition available.
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- Definition
The cost of productive oil and gas wells acquired during the period. No definition available.
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- Definition
The total number of producing oil and gas wells and oil wells capable of production, in which the entity owns an undivided working interest. No definition available.
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- Definition
The total number of producing oil and gas wells capable of production, in which the entity owns a fractional working interest. No definition available.
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- Definition
Unproven acreage is considered to be those lease acres on which geologic and/or engineering data similar to that used in estimates of proven; but technical, contractual, economic, or regulatory uncertainties preclude such reserves being classified as proven. No definition available.
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- Definition
The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Future cash outflow to pay for purchases of fixed assets that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The sum of the capitalized costs incurred during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The capitalized costs incurred during the period (excluded from amortization) to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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