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Capital Stock (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Nov. 30, 2005
Capital Unit [Line Items]      
Common Stock, shares authorized 180,000,000us-gaap_CommonStockSharesAuthorized    
Common stock, par value (dollars per share) 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue  
Common stock, shares, outstanding 37,479,832us-gaap_CommonStockSharesOutstanding 37,448,310us-gaap_CommonStockSharesOutstanding  
Treasury stock, shares 24,601,559us-gaap_TreasuryStockShares 24,633,081us-gaap_TreasuryStockShares  
Second Cumulative Preferred Voting Stock      
Capital Unit [Line Items]      
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= msa_SecondCumulativePreferredVotingStockMember
   
Preferred stock, par value (dollars per share) 10us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= msa_SecondCumulativePreferredVotingStockMember
   
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= msa_SecondCumulativePreferredVotingStockMember
   
Treasury Stock      
Capital Unit [Line Items]      
Reissued shares 93,366us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
   
Board of Directors      
Capital Unit [Line Items]      
Common stock, value, issued     $ 100,000,000us-gaap_CommonStockValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msa_BoardofDirectorsMember
4 1/2% Cumulative Preferred Nonvoting Stock      
Capital Unit [Line Items]      
Preferred stock, shares authorized 100,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember
   
Preferred stock, par value (dollars per share) 50us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember
   
Percentage of cumulative preferred stock 4.50%msa_PercentageOfCumulativePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember
   
Preferred stock, callable price per share 52.50us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember
   
Preferred stock, shares issued 71,373us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember
   
Treasury share, number of shares held 52,878msa_TreasuryStockPreferredShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember
   
Purchase of treasury shares 0msa_PurchaseOfTreasuryStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CumulativePreferredStockMember