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Ownership and Management of the Company (Details) (VoteCo)
Nov. 30, 2014
Timothy T. Janszen  
Ownership and Management of the Company [Line Items]  
Beneficial ownership by third party of shareholder (percent) 42.85%ck0001405621_BeneficialOwnershipByThirdPartyOfShareholder
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Ryan L. Langdon  
Ownership and Management of the Company [Line Items]  
Beneficial ownership by third party of shareholder (percent) 42.85%ck0001405621_BeneficialOwnershipByThirdPartyOfShareholder
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Roger A. May  
Ownership and Management of the Company [Line Items]  
Beneficial ownership by third party of shareholder (percent) 14.30%ck0001405621_BeneficialOwnershipByThirdPartyOfShareholder
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