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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 246,653us-gaap_Goodwill	$ 252,520us-gaap_Goodwill
North American Segment
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	196,500us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = msa_NorthAmericanSegmentMember
European Segment
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	48,100us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = msa_EuropeanSegmentMember
International Segment
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,100us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = msa_InternationalSegmentMember

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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