Fair Value Accounting - Narrative (Details)	9 Months Ended	0 Months Ended
Sep. 30, 2012 StreetLinks LLC [Member]	Mar. 22, 2011 Post-Modification Notes [Member] Interest Rate, Post-Trigger [Member] Senior Notes [Member]
Debt Instrument [Line Items]
Variable rate, description		three-month LIBOR
Variable rate		3.50%
Interest rate	4.00%

Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent, Interest Rate

No definition available.

Name:	novs_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentInterestRate
Namespace Prefix:	novs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration