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Segment Information - Geographic Information on Sales to External Customers (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers	$ 311,188us-gaap_SalesRevenueNet	$ 275,159us-gaap_SalesRevenueNet	$ 282,493us-gaap_SalesRevenueNet	$ 265,045us-gaap_SalesRevenueNet	$ 291,429us-gaap_SalesRevenueNet	$ 264,884us-gaap_SalesRevenueNet	$ 285,859us-gaap_SalesRevenueNet	$ 269,886us-gaap_SalesRevenueNet	$ 1,133,885us-gaap_SalesRevenueNet	$ 1,112,058us-gaap_SalesRevenueNet	$ 1,110,443us-gaap_SalesRevenueNet
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									530,845us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	528,178us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	527,550us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Germany
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									74,677us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE	71,139us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE	74,557us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE
Other Country
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									$ 528,363us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = msa_OtherCountryMember	$ 512,741us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = msa_OtherCountryMember	$ 508,336us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = msa_OtherCountryMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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- Details

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- Details

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