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Segment Information - Revenue from External Customers by Products and Services (Details) (Sales) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fix Gas & Flame Detection Instruments |  |  |
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 | 20.00%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) | 19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_BreathingApparatusMember | 21.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_BreathingApparatusMember | 20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_BreathingApparatusMember
Portable Instruments |  |  |
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 | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_PortableInstrumentsMember | 13.00%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) | 13.00%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 | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_HeadProtectionMember
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 | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_FallProtectionMember
Other Products |  |  |
Revenue from External Customer [Line Items] |  |  |
Concentration risk (percentage) | 26.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_OtherProductsMember | 26.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_OtherProductsMember | 32.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ProductOrServiceAxis = msa_OtherProductsMember

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