Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

v2.4.1.9
RELATED PARTY TRANSACTIONS (Details) (Emerald [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Well
Mar. 31, 2014
Dec. 31, 2014
Emerald [Member]
     
Related Party Transaction [Line Items]      
Number of producing wells, gross 43nog_NumberOfProductiveWellsGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Number of producing wells, net 7.8nog_NumberOfProductiveWellsNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Number of drilling or awaiting completion wells, gross 5nog_NumberOfDrillingOrAwaitingCompletionWellsGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Number of drilling or awaiting completion wells, net 0.3nog_NumberOfDrillingOrAwaitingCompletionWellsNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Number of producing and drilling wells, gross 48nog_NumberOfProductiveAndDrillingWellsGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Estimated total drilling and completion cost of wells $ 492.4nog_EstimatedTotalDrillingAndCompletionCostOfWells
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Estimated total drilling and completion cost of wells attributable to entity 82.2nog_EstimatedTotalDrillingAndCompletionCostOfWellsAttributableToEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Accounts receivable from related parties 1.2us-gaap_DueFromAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
  2.9us-gaap_DueFromAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
Accounts payable to related parties 7.6us-gaap_DueToAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
  8.4us-gaap_DueToAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
Revenue from related party transactions $ 2.0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
$ 5.3us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember