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2442406 - Disclosure - Pensions and Other Post-retirement Benefits - Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)
(http://www.msasafety.com/role/PensionsAndOtherPostRetirementBenefitsScheduleOfAssumptionsUsedToDetermineBenefitObligationsAndNetPeriodicBenefitCostDetail)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000066570 (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
Defined Benefit Plans and Other Postretirement Benefit PlansDefined Benefit Plans and Other Postretirement Benefit Plans
Pension BenefitsOther BenefitsPension BenefitsOther Benefits
Assumptions used to determine benefit obligations, average discount rate
3.67%  
4.05%  
3.92%  
4.20%  
Assumptions used to determine benefit obligations, rate of compensation increase
2.99%  
 
3.06%  
 
Assumptions used to determine net periodic benefit cost, average discount rate
3.92%  
4.20%  
3.63%  
3.85%  
Assumptions used to determine net periodic benefit cost, expected return on plan assets
8.18%  
 
8.17%  
 
Assumptions used to determine net periodic benefit cost, rate of compensation increases
3.06%  
 
3.03%