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Fair Value Accounting - Narrative (Details) (Post-Modification Notes [Member], Senior Notes [Member])
 0 Months Ended
Mar. 22, 2011
Interest Rate, Pre-Trigger [Member]
  
Debt Instrument [Line Items]  
Interest rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ novc_InterestRateModificationAxis
= novc_InterestRatePreTriggerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Interest Rate, Post-Trigger [Member]
  
Debt Instrument [Line Items]  
Variable rate, description three-month LIBOR
Basis spread on variable rate 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ novc_InterestRateModificationAxis
= novc_InterestRatePostTriggerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember