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Note Receivable, Mesquite (Details) (Mesquite, USD $)
Aug. 22, 2013
Debt Instrument [Line Items]  
Due from the Newport Funds $ 14,000,000us-gaap_DueFromRelatedPartiesNoncurrent
Cash on hand used to fund Mesquite loan 1,000,000ck0001405621_CashonhandusedtofundRelatedPartyLoan
InvestCo
  
Debt Instrument [Line Items]  
Contributions to fund Mesquite loan 13,000,000ck0001405621_ContributionstofundRelatedPartyLoan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NgaNoVotecoLlcMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
NGOF
  
Debt Instrument [Line Items]  
Contributions to fund Mesquite loan 11,300,000ck0001405621_ContributionstofundRelatedPartyLoan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalOpportunitiesFundLpMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
NGCF
  
Debt Instrument [Line Items]  
Contributions to fund Mesquite loan 1,700,000ck0001405621_ContributionstofundRelatedPartyLoan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalCreditFundLPMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
Loans Payable and Loans from Parent Company
  
Debt Instrument [Line Items]  
Long term debt gross $ 35,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ck0001405621_LoansPayableandLoansfromParentCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
Loans Payable and Loans from Parent Company | August 22, 2013 to August 22, 2014
  
Debt Instrument [Line Items]  
Interest rate (percent) 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ ck0001405621_DebtInstrumentInterestRatePeriodAxis
= ck0001405621_PeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= ck0001405621_LoansPayableandLoansfromParentCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
Loans Payable and Loans from Parent Company | After August 22, 2014
  
Debt Instrument [Line Items]  
Interest rate (percent) 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ ck0001405621_DebtInstrumentInterestRatePeriodAxis
= ck0001405621_PeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= ck0001405621_LoansPayableandLoansfromParentCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember