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Note 6 - Acquisitions - Amounts Assigned to Intangible Assets (Details) - The 2021 Acquisitions [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Total intangible assets | $ 25.3
Technology [Member] |
Weighted average useful life (Year) | 4 years
Total intangible assets | $ 5.6
Marketing [Member] |
Weighted average useful life (Year) | 5 years
Total intangible assets | $ 1.0
Customer [Member] |
Weighted average useful life (Year) | 11 years
Total intangible assets | $ 16.3
Database [Member] |
Weighted average useful life (Year) | 2 years
Total intangible assets | $ 2.4

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=vrsk_The2021AcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=vrsk_TechnologyMember
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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=vrsk_MarketingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=vrsk_CustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=vrsk_DatabaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |