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Employee Benefits And Stock-Based Compensation (401(k) Plan To 2007 Employee Stock Purchase Plan) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Rate
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employer contribution under the plan $ 3.4us-gaap_DefinedContributionPlanCostRecognized $ 3.1us-gaap_DefinedContributionPlanCostRecognized $ 2.8us-gaap_DefinedContributionPlanCostRecognized
Common stock were reserved for issuance 13.3us-gaap_CommonStockCapitalSharesReservedForFutureIssuance    
Purchase price of common stock as percentage of lower of fair market value of common stock share on first day of offering period or last day of purchase period 85.00%vrsn_PurchasePriceOfCommonStockAsPercentageOfLowerOfFairMarketValueOfCommonStockShareOnFirstDayOfOfferingPeriodOrLastDayOfPurchasePeriod    
401 (k) Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee's contribution under the plan 50.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= vrsn_FourHundredOnePlanKPlanMember		    
Share-Based Compensation Arrangement By Share-Based Payment Award, Employer Contribution As A Percentage Of Employee Contribution 50.00%vrsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployerContributionAsPercentageOfEmployeeContribution
/ us-gaap_AwardTypeAxis
= vrsn_FourHundredOnePlanKPlanMember		    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage of Options/RSUs 25.00%vrsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentage
/ us-gaap_PlanNameAxis
= us-gaap_RestrictedStockUnitsRSUMember		    
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock were reserved for issuance 1.7us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember		    
Two Thousand Seven Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock were reserved for issuance 6.0us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= vrsn_TwoThousandSevenEmployeeStockPurchasePlanMember		    
Two Thousand Six Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock were reserved for issuance 27.0us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= vrsn_TwoThousandSixEquityIncentivePlanMember		    
Minimum [Member] | Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of compensation withheld to cover purchase price of common stock 2.00%vrsn_PercentageOfCompensationWithheldToCoverPurchasePriceOfCommonStock
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member] | 401 (k) Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employer contribution as a percentage of employee's annual salary 6.00%vrsn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployerContributionAsPercentageOfEmployeesAnnualSalary
/ us-gaap_AwardTypeAxis
= vrsn_FourHundredOnePlanKPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Maximum [Member] | Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of compensation withheld to cover purchase price of common stock 25.00%vrsn_PercentageOfCompensationWithheldToCoverPurchasePriceOfCommonStock
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember