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Note 18 - Pension and Postretirement Benefits (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy	$ 800,000	$ 800,000
Changes In Assumed Healthcare Cost Trend Rate	1.00
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy	$ 58,200	$ 48,500	$ 51,000.0
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	52.50%	53.70%
Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	60.00%
Debt Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	45.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	40.00%	37.90%
Debt Securities [Member] | Veba [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Foreign Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%
Foreign Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
Fixed Income Funds [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
Fixed Income Funds [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%
Pension Plan [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 0
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0
Pension Plan [Member] | Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55.00%	60.00%
Pension Plan [Member] | Debt Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	45.00%	40.00%
Pension Plan And Supplemental Cash Balance Plan [Member]
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy	$ 700,000	$ 700,000
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 1,000,000.0
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	8.00%
Defined Benefit Plan Ultimate Health Care Cost Decreasing Trend Rate	4.50%
Pension Plan and SERP Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligations, Expected Return On Plan Assets	6.50%	6.75%

X

- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

+ Details

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

X

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of decrease in accumulated postretirement benefit obligation for government subsidy related to prescription drug benefits attributed to past service.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964

+ Details

Name:	us-gaap_DefinedBenefitPlanPrescriptionDrugBenefitAccumulatedPostretirementBenefitObligationDecreaseForSubsidy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of (increase) decrease in net periodic benefit cost from government subsidy for prescription drug benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964

+ Details

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

X

- Definition

This element represents the sensitivity test over the healthcare cost trend rate and its impact to an entity P&L.

+ References

No definition available.

+ Details

Name:	vrsk_ChangesInAssumedHealthcareCostTrendRate
Namespace Prefix:	vrsk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the anticipated increase in the plan assets used in calculating benefit obligations.

+ References

No definition available.

+ Details

Name:	vrsk_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationsExpectedReturnOnPlanAssets
Namespace Prefix:	vrsk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents the projected trend rate for health care costs in the future.

+ References

No definition available.

+ Details

Name:	vrsk_DefinedBenefitPlanUltimateHealthCareCostDecreasingTrendRate
Namespace Prefix:	vrsk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=vrsk_VebaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=vrsk_ForeignPensionPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=vrsk_PensionPlanAndSupplementalCashBalancePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=vrsk_PensionPlanAndSERPPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: