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2417407 - Disclosure - Pension and Postretirement Benefits - Summary of Weighted-Average Assumptions Used in Calculating Net Periodic Benefit (Credit) Cost (Detail)
(http://www.verisk.com/role/PensionAndPostretirementBenefitsSummaryOfWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCreditCostDetail)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001442145 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Plan and SERP Plan [Member]Postretirement Plan [Member]Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]Pension Plan and SERP Plan [Member]Postretirement Plan [Member]Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]Pension Plan and SERP Plan [Member]Postretirement Plan [Member]
Weighted-average assumptions used to determine benefit obligations:
 
 
 
 
 
 
 
 
Discount rate
3.99%  
3.25%  
 
4.73%  
3.25%  
   
Expected return on plan assets
 
3.00%  
 
7.50%  
4.00%  
   
Weighted-average assumptions used to determine net periodic benefit (credit) loss:
 
 
 
 
 
 
 
 
Discount rate
4.73%  
3.25%  
 
3.99%  
3.00%  
 
4.73%  
3.45%  
Expected return on plan assets
7.50%  
4.00%  
7.25%  
7.50%  
4.00%  
7.50%  
7.50%  
5.00%