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Subsequent Events-Eldorado Transaction Purchase Price Adjustment (Details) (Subsequent Event, Eldorado)
Dec. 13, 2014
Subsequent Event | Eldorado
 
Subsequent Event [Line Items]  
Common stock issued (shares) 51,867us-gaap_CommonStockSharesIssued
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ck0001405621_EldoradoLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember