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Fair Value Accounting - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Mar. 22, 2011
Dec. 31, 2013
Debt Instrument [Line Items]    
Note payable to related party, current   1.3us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Note payable to related party, noncurrent   2.6us-gaap_NotesPayableRelatedPartiesNoncurrent
Post-Modification Notes [Member] | Interest Rate, Pre-Trigger [Member] | Senior Notes [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		  
Post-Modification Notes [Member] | Interest Rate, Post-Trigger [Member] | Senior Notes [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		  
Unit Purchase Agreement [Member] | StreetLinks LLC [Member]    
Debt Instrument [Line Items]    
Interest rate   4.00%novc_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentInterestRate
/ dei_LegalEntityAxis
= novc_StreetlinksLlcMember
/ novc_MaterialDefinitiveAgreementAxis
= novc_UnitPurchaseAgreementMember