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Commitments and Contingencies - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Mar. 26, 2009
Nov. 14, 2008
Feb. 22, 2007
Dec. 31, 2012
Dec. 31, 2006
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 02, 2009
Commitments and Contingencies Disclosure [Abstract]                  
Rent expense           $ 1,824,000us-gaap_OperatingLeasesRentExpenseNet $ 1,820,000us-gaap_OperatingLeasesRentExpenseNet $ 1,677,000us-gaap_OperatingLeasesRentExpenseNet  
Legal settlement cost     50,000,000us-gaap_LossContingencyDamagesPaidValue            
Reimbursed by the insurance carriers     12,800,000vicr_ReimbursementOfLossFromInsurance            
Gain (loss) from the litigation-related settlements       1,975,000us-gaap_GainLossRelatedToLitigationSettlement (37,200,000)us-gaap_GainLossRelatedToLitigationSettlement     1,975,000us-gaap_GainLossRelatedToLitigationSettlement  
Jury awarded in damages to the Company   17,300,000us-gaap_LossContingencyDamagesAwardedValue              
Reduction in jury award                 4,000,000vicr_LossContingencyReductionInDamagesAwardedValue
Affirming the award 13,300,000vicr_AmountPaidForAffirmingAward                
Prejudgment interest 3,179,000vicr_AmountOfPrejudgmentInterestPaid                
Insurance carriers total 16,479,000vicr_GrossAmountPaidByInsuranceCarriers                
Insurance carriers on cash payment               $ 1,975,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities