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