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Subsequent Events (Details) (Subsequent Event, USD $)
In Millions, unless otherwise specified
Feb. 20, 2015
Subsequent Event [Line Items]  
Removed covenant, restricted payment maximum $ 5.0visi_DebtInstrumentsRemovedCovenantRestrictedPaymentMaximum
Removed covenant, restricted payment maximum, percent of net consolidated income 50.00%visi_DebtInstrumentsRemovedCovenantRestrictedPaymentMaximumPercentofNetConsolidatedIncome
Line of Credit  
Subsequent Event [Line Items]  
Line of credit facility borrowing capacity $ 45.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember