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Organization (Details) (USD $)
0 Months Ended
Aug. 01, 2011
Sep. 01, 2014
Nov. 30, 2014
table_game
hotel_room
property
restaurant
subsidiary
golf_course
slot_machine
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     280ck0001405621_NumberofTableGames    
Number of restaurants     32us-gaap_NumberOfRestaurants    
Number of slot machines     10,000ck0001405621_NumberofSlotMachines    
Number of championship golf courses     2ck0001405621_NumberofChampionshipGolfCourses    
Newport          
Schedule of Equity Method Investments [Line Items]          
Number of employees     10dei_EntityNumberOfEmployees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalAdvisorsLpMember
   
Eldorado          
Schedule of Equity Method Investments [Line Items]          
Equity method investee percentage ownership in JV (percent)     17.0359%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
   
Eldorado | 96% owned subsidiary          
Schedule of Equity Method Investments [Line Items]          
Equity investee ownership interest in subsidiary (percent)     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 (percent)     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 (percent)     40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
   
Par value (usd per share)     0.00001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
$ 0.00001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
 
Equity method investee percentage ownership in JV (percent)     8.60%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
8.60%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
 
Common stock issued (shares)       4,040,440us-gaap_CommonStockSharesIssued
/ 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 (percent)         21.25%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_TamarackCrossingLLCMember
Proceeds from divestiture of interest in joint venture   $ 1,350,000us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_TamarackCrossingLLCMember