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Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Income tax expense at federal statutory rate   $ (169,159,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (159,870,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (144,443,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit   (11,308,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (13,821,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (10,003,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Differences between statutory rate and foreign effective tax rate   57,876,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 51,016,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 51,780,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Reorganization Items   (14,474,000)us-gaap_ReorganizationItems 0us-gaap_ReorganizationItems 0us-gaap_ReorganizationItems
income tax benefit, related to worthless stock deduction   (14,497,000)vrsn_Incometaxbenefitrelatedtoworthlessstockdeduction 1,717,466,000vrsn_Incometaxbenefitrelatedtoworthlessstockdeduction 0vrsn_Incometaxbenefitrelatedtoworthlessstockdeduction
Change in valuation allowance   41,700,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (1,195,303,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 5,760,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Repatriation of Foreign Earnings, Income tax (167,115,000)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 4,164,000us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings (167,115,000)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Accrual for uncertain tax positions   (22,719,000)us-gaap_IncomeTaxReconciliationTaxContingencies (140,596,000)us-gaap_IncomeTaxReconciliationTaxContingencies (306,000)us-gaap_IncomeTaxReconciliationTaxContingencies
Other   366,000us-gaap_IncomeTaxReconciliationOtherAdjustments (4,098,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (2,998,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax (expense) benefit   $ (128,051,000)us-gaap_IncomeTaxExpenseBenefit $ 87,679,000us-gaap_IncomeTaxExpenseBenefit $ (100,210,000)us-gaap_IncomeTaxExpenseBenefit