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Note 5 - Leases (Details Textual) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Lessee, Lease, Option to Extend (Year) | 20 years |
Lessee, Lease, Option to Terminate (Year) | 1 year |
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total | $ 29.1 | $ 9.9
Finance Lease, Liability, Total | $ 20.6 | $ 7.7
Minimum [Member] |  |
Lessee, Lease, Term of Contract (Year) | 1 year |
Maximum [Member] |  |
Lessee, Lease, Term of Contract (Year) | 14 years |

X
- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Description of terms and conditions of option to extend lessee's lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References No definition available. + Details
Name: | vrsk_LesseeLeaseOptionToExtend
Namespace Prefix: | vrsk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of terms and conditions of option to terminate lessee's lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References No definition available. + Details
Name: | vrsk_LesseeLeaseOptionToTerminate
Namespace Prefix: | vrsk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | vrsk_LesseeLeaseRemainingTermOfContract
Namespace Prefix: | vrsk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |