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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
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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 | $ 311,188 us-gaap_SalesRevenueNet | $ 275,159 us-gaap_SalesRevenueNet | $ 282,493 us-gaap_SalesRevenueNet | $ 265,045 us-gaap_SalesRevenueNet | $ 291,429 us-gaap_SalesRevenueNet | $ 264,884 us-gaap_SalesRevenueNet | $ 285,859 us-gaap_SalesRevenueNet | $ 269,886 us-gaap_SalesRevenueNet | $ 1,133,885 us-gaap_SalesRevenueNet | $ 1,112,058 us-gaap_SalesRevenueNet | $ 1,110,443 us-gaap_SalesRevenueNet
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers |  |  |  |  |  |  |  |  | 530,845 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 528,178 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 527,550 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Germany |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers |  |  |  |  |  |  |  |  | 74,677 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE | 71,139 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE | 74,557 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE
Other Country |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to external customers |  |  |  |  |  |  |  |  | $ 528,363 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = msa_OtherCountryMember | $ 512,741 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = msa_OtherCountryMember | $ 508,336 us-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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