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Investments in Mesquite Rollforward (Details) (USD $)
12 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Equity Method Investment Rollforward [Roll Forward]    
Distributions received $ (269,000)us-gaap_EquityMethodInvestmentDividendsOrDistributions $ 0us-gaap_EquityMethodInvestmentDividendsOrDistributions
Equity in net income of Mesquite 199,613us-gaap_IncomeLossFromEquityMethodInvestments 3,774,862us-gaap_IncomeLossFromEquityMethodInvestments
Mesquite    
Equity Method Investment Rollforward [Roll Forward]    
Balance, beginning of period 4,244,222us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
3,580,222us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
Equity in net income of Mesquite 307,200us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
664,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
Balance, end of period $ 4,282,422us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember
$ 4,244,222us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_MesquiteGamingLLCMember