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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |  |  |
Intercompany dividend | $ 30,650 vdsi_IntercompanyDividend | $ 30,752 vdsi_IntercompanyDividend | $ 0 vdsi_IntercompanyDividend
Statutory tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Long-term deferred tax assets | 6,885 us-gaap_DeferredTaxAssetsGrossNoncurrent | 6,334 us-gaap_DeferredTaxAssetsGrossNoncurrent |
Current deferred tax liabilities | 1,235 us-gaap_DeferredTaxLiabilitiesCurrent | 726 us-gaap_DeferredTaxLiabilitiesCurrent |
Unremitted foreign earnings available for distribution | 19,849 vdsi_UnremittedForeignEarnings | 46,012 vdsi_UnremittedForeignEarnings |
Deferred tax liability | 955 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | 380 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |
Amount of Unremitted foreign earnings permanently invested | 83,122 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 50,398 us-gaap_UndistributedEarningsOfForeignSubsidiaries |
U.S. net operating loss carryforwards | 122 vdsi_NetOperatingLossCarryforwardDomestic | 10,586 vdsi_NetOperatingLossCarryforwardDomestic |
Employee stock options included in operating loss carryforwards |  | 9,741 vdsi_OperatingLossCarryforwardsAttributableToTaxBenefitFromExerciseOfStockOption |
Amount of stock option tax benefit credited to additional paid-in capital. |  | 3,318 us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity |
U.S. foreign tax credit | 5,516 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 5,058 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Foreign NOL carryforwards | 4,366 vdsi_ForeignNolCarryForwards |  |
Other Foreign Deductible carryforwards | 3,568 vdsi_OtherForeignDeductibleCarryForwards |  |
Expiry Date of other deductible carryforwards | 2016-2021 |  |
Net increase (decrease) change in the valuation allowance | 101 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease | 115 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease | 196 us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
Tax benefit reserve | 2,500 us-gaap_DeferredTaxAssetsValuationAllowance | 2,399 us-gaap_DeferredTaxAssetsValuationAllowance |
2015 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Foreign tax credit carryforwards expire amount | 944 vdsi_ForeignTaxCreditCarryforwardsExpireAmount / us-gaap_StatementScenarioAxis = vdsi_TwoThousandFifteenMember |  |
2023 And 2024 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Foreign tax credit carryforwards expire amount | 4,572 vdsi_ForeignTaxCreditCarryforwardsExpireAmount / us-gaap_StatementScenarioAxis = vdsi_TwoThousandTwentyThreeAndTwoThousandTwentyFourMember |  |
Intellectual Property [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax benefit reserve | 560 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_IntellectualPropertyMember | 560 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_IntellectualPropertyMember |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance for deferred tax assets | $ 2,378 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |

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