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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal tax rate	(34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	(34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	(34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal income tax benefit	0.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(9.40%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax credits	(12.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(8.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	0.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
U.S. manufacturing deduction		1.70%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(3.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Permanent items	0.40%vicr_EffectiveIncomeTaxRateReconciliationPermanentItems	0.60%vicr_EffectiveIncomeTaxRateReconciliationPermanentItems	2.20%vicr_EffectiveIncomeTaxRateReconciliationPermanentItems
Book income attributable to noncontrolling interest	(0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	6.80%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Foreign rate differential and deferred items	(0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Increase (decrease) in tax reserves	(3.70%)vicr_EffectiveIncomeTaxRateReconciliationIncreaseDecreaseTaxReserves	(0.10%)vicr_EffectiveIncomeTaxRateReconciliationIncreaseDecreaseTaxReserves	0.30%vicr_EffectiveIncomeTaxRateReconciliationIncreaseDecreaseTaxReserves
Increase in valuation allowance	46.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	53.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	84.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other		0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate	(2.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	14.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations	46.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Topic 235

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-Section S99

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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