Related Parties (Details) - relatedparty	Mar. 31, 2020	Dec. 31, 2019
Related Party Transactions [Abstract]
Percentage of ownership on outstanding common stock required to become related party (more than)	5.00%	5.00%
Number of related parties	0	0

Percentage Of Ownership On Outstanding Common Stock Required To Become Related Party

No definition available.

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