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Segment Information - Revenue from External Customers by Products and Services (Details) (Sales) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fixed Gas and Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FixGasFlameDetectionInstrumentsMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FixGasFlameDetectionInstrumentsMember
Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_BreathingApparatusMember | 18.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_BreathingApparatusMember
Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_PortableInstrumentsMember | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_PortableInstrumentsMember
Head Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_HeadProtectionMember | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_HeadProtectionMember
Fire and Rescue Helmets |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FireandRescueHelmetsMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FireandRescueHelmetsMember
Fall Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FallProtectionMember | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FallProtectionMember
Other |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_OtherProductsMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_OtherProductsMember

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