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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 3,272 us-gaap_AvailableForSaleSecurities | $ 5,651 us-gaap_AvailableForSaleSecurities
Failed Auction Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 2,575 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Valuation Technique | Discounted cash flow |
Failed Auction Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Earning Maximum Rate Until Maturity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Cumulative probability of earning the maximum rate until maturity |
Weighted Average Interest Rate | 0.02%vicr_WeightedAverageRateUseToMeasureFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = vicr_CumulativeProbabilityOfEarningMaximumRateUntilMaturityMember |
Failed Auction Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Principal Return Prior to Maturity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Cumulative probability of principal return prior to maturity |
Weighted Average Interest Rate | 93.74%vicr_WeightedAverageRateUseToMeasureFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = vicr_CumulativeProbabilityOfPrincipalReturnPriorToMaturityMember |
Failed Auction Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Default [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Cumulative probability of default |
Weighted Average Interest Rate | 6.24%vicr_WeightedAverageRateUseToMeasureFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = vicr_CumulativeProbabilityOfDefaultMember |
Failed Auction Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Liquidity Risk Premium [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Liquidity risk premium |
Weighted Average Interest Rate | 5.00%vicr_WeightedAverageRateUseToMeasureFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = vicr_LiquidityRiskPremiumMember |
Failed Auction Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recovery Rate in Default [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Recovery rate in default |
Weighted Average Interest Rate | 40.00%vicr_WeightedAverageRateUseToMeasureFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AuctionRateSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = vicr_RecoveryRateInDefaultMember |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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