Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS (Details)

v2.4.1.9
RELATED PARTY TRANSACTIONS (Details) (Emerald [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Well
Dec. 31, 2013
Dec. 31, 2012
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 4nog_NumberOfDrillingOrAwaitingCompletionWellsGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Number of drilling or awaiting completion wells, net 0.2nog_NumberOfDrillingOrAwaitingCompletionWellsNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Number of producing and drilling wells, gross 47nog_NumberOfProductiveAndDrillingWellsGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Estimated total drilling and completion cost of wells $ 479nog_EstimatedTotalDrillingAndCompletionCostOfWells
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Estimated total drilling and completion cost of wells attributable to entity 80nog_EstimatedTotalDrillingAndCompletionCostOfWellsAttributableToEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
   
Accounts receivable from related parties 2.9us-gaap_DueFromAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
4.6us-gaap_DueFromAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
 
Accounts payable to related parties 8.4us-gaap_DueToAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
23.2us-gaap_DueToAffiliateCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
 
Revenue from related party transactions $ 13.3us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
$ 7.8us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember
$ 0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= nog_EmeraldMember