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Transaction with the Newport Funds (Details) (USD $)
12 Months Ended
Dec. 31, 2007
Feb. 28, 2015
Feb. 28, 2014
NGOF      
Related Party Transaction [Line Items]      
Interest payment received $ 5,118,172us-gaap_ProceedsFromInterestReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalOpportunitiesFundLpMember
   
Preferred dividends received 61,600ck0001405621_ProceedsFromPreferredDividendsReceived
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalOpportunitiesFundLpMember
   
Newport      
Related Party Transaction [Line Items]      
Long-term amounts due to the Newport Funds   $ 3,687,854us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalAdvisorsLpMember
$ 3,450,793us-gaap_DueToRelatedPartiesNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ck0001405621_NewportGlobalAdvisorsLpMember