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Organization (Details) (USD $)
12 Months Ended 0 Months Ended
Feb. 28, 2015
employee
Aug. 02, 2011
Sep. 01, 2014
Sep. 19, 2014
Aug. 31, 2014
Schedule of Equity Method Investments [Line Items]          
Number of wholly owned subsidiaries 2ck0001405621_WhollyOwnedSubsidiariesNumber        
Number of properties with controlling interest (properties) 6ck0001405621_NumberofPropertieswithControllingInterest        
Number of hotel rooms 3,300ck0001405621_NumberofHotelRooms        
Number of table games 240ck0001405621_NumberofTableGames        
Number of restaurants 40us-gaap_NumberOfRestaurants        
Number of slot machines 7,800ck0001405621_NumberofSlotMachines        
Number of video lottery terminals 2,150ck0001405621_NumberofVideoLotteryTerminals        
Newport          
Schedule of Equity Method Investments [Line Items]          
Number of employees 10dei_EntityNumberOfEmployees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalAdvisorsLpMember
       
Number of cumulative years of experience 40 years        
Eldorado          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage in equity method investment 17.0359%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
       
Common stock issued, shares       4,030,440us-gaap_CommonStockSharesIssued
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
 
Par value (usd per share)       $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
 
Equity method investee percentage ownership in JV       8.60%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
 
Eldorado | 96% owned subsidiary          
Schedule of Equity Method Investments [Line Items]          
Equity investee ownership interest in subsidiary 96.00%ck0001405621_EquityInvesteeOwnershipInterestInSubsidiary
/ dei_LegalEntityAxis
= ck0001405621_NinetySixPercentOwnedSubsidiaryMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
       
Eldorado | Silver Legacy Resort Casino          
Schedule of Equity Method Investments [Line Items]          
Equity method investee percentage ownership in JV 50.00%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ dei_LegalEntityAxis
= ck0001405621_SilverLegacyResortCasinoMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
       
Mesquite          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage in equity method investment 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
       
Cash payment to acquire equity method investment   $ 8,222,222us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
     
Mesquite | NGOF          
Schedule of Equity Method Investments [Line Items]          
Cash payment to acquire equity method investment   7,222,222us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalOpportunitiesFundLpMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
     
Mesquite | NGCF          
Schedule of Equity Method Investments [Line Items]          
Cash payment to acquire equity method investment   1,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalCreditFundLPMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
     
Tamarack Crossing, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity method investee percentage ownership in JV         21.25%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_TamarackCrossingLLCMember
Proceeds from sale of equity interest     $ 1,350,000us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_TamarackCrossingLLCMember