Fair Value Of Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Feb. 15, 2015
contingent interest payment		$ 5,200,000vrsn_Contingentinterestpayment
Fair value assumptions expected volatility rate	32.00%
fair value hypothetical increase decrease in volatility rate	5.00%
fair value assumptions credit spread	4.00%vrsn_FairValueAssumptionsCreditSpread
fair value hypothetical increase decrease in credit spread	1.00%
Convertible Debt, Fair Value Disclosures	2,200,000,000
Debt Instrument, Fair Value Disclosure	$ 727,600,000us-gaap_DebtInstrumentFairValue

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

contingent interest payment

+ References

No definition available.

+ Details

Name:	vrsn_Contingentinterestpayment
Namespace Prefix:	vrsn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

fair value assumptions credit spread

+ References

No definition available.

+ Details

Name:	vrsn_FairValueAssumptionsCreditSpread
Namespace Prefix:	vrsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

fair value hypothetical increase or decrease in credit spread

+ References

No definition available.

+ Details

Name:	vrsn_FairValueHypotheticalIncreaseDecreaseInCreditSpread
Namespace Prefix:	vrsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

fair value hypothetical increase decrease in volatility rate

+ References

No definition available.

+ Details

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Namespace Prefix:	vrsn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration