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Investment in Eldorado Narrative (Details) (Eldorado, USD $)
Feb. 28, 2015
Sep. 19, 2014
Feb. 28, 2014
May 29, 2015
Dec. 14, 2007
Schedule of Equity Method Investments [Line Items]          
Ownership percentage in equity method investment 17.0359%us-gaap_EquityMethodInvestmentOwnershipPercentage        
Common stock issued, shares   4,030,440us-gaap_CommonStockSharesIssued      
Par value (usd per share)   $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare      
Equity method investee percentage ownership in JV   8.60%ck0001405621_EquityInvesteeOwnershipInterestInJointVenture      
Unrealized holding gain (loss) $ 1,900,000us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax        
Estimated fair value 18,540,023us-gaap_AvailableForSaleSecurities 7,100,000us-gaap_AvailableForSaleSecurities 0us-gaap_AvailableForSaleSecurities    
Subsequent Event
         
Schedule of Equity Method Investments [Line Items]          
Unrealized holding gain (loss)       (9,800,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Estimated fair value       33,500,000us-gaap_AvailableForSaleSecurities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Level 2          
Schedule of Equity Method Investments [Line Items]          
Value of mortgage bonds and preferred equity interest         $ 38,000,000ck0001405621_MortgageBondsAndPreferredEquityInterestsValuation
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember