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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 252,520,000 us-gaap_Goodwill | $ 260,134,000 us-gaap_Goodwill | $ 258,400,000 us-gaap_Goodwill
Intangible Assets |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Future amortization expense, 2015 | 3,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = msa_IntangibleAssetsMember |  |
Future amortization expense, 2016 | 3,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = msa_IntangibleAssetsMember |  |
Future amortization expense, 2017 | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = msa_IntangibleAssetsMember |  |
Future amortization expense, 2018 | 1,900,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = msa_IntangibleAssetsMember |  |
Future amortization expense, 2019 | 1,900,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = msa_IntangibleAssetsMember |  |
North American |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 196,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = msa_NorthAmericanMember |  |
European |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 53,900,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = msa_EuropeanMember |  |
International |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 2,100,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = msa_InternationalMember |  |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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