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Note 15 - Related Parties (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Percentage Of Ownership On Outstanding Common Stock Required To Become Related Party	5.00%
Related Party Transaction, Amounts of Transaction	$ 0	$ 0

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

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

X

- Definition

Represents percentage of ownership on outstanding common stock required to become related party.

+ References

No definition available.

+ Details

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