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Short-Term and Long-Term Debt - Long-Term Debt - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 07, 2014 | Jan. 31, 2014 loan | Feb. 28, 2014 | Dec. 31, 2014 | Jun. 02, 2014
Debt Instrument [Line Items] |  |  |  |  |
Unsecured senior revolving credit facility | $ 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 6,500,000 us-gaap_LettersOfCreditOutstandingAmount |
Unsecured senior revolving credit facility, maturity date | Mar. 31, 2019 |  |  |  |
Interest rate during period (percent) | 1.16%us-gaap_DebtInstrumentInterestRateDuringPeriod |  |  |  |
Increase in the senior credit facility | 150,000,000 msa_IncreaseInSeniorCreditFacility |  |  |  |
Unused senior revolving credit facility |  |  |  | 193,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |
Cash collateral |  |  |  | 2,700,000 us-gaap_DebtInstrumentCollateralAmount |
Maturity obligation, 2015 |  |  |  | 6,700,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |
Maturity obligation, 2016 |  |  |  | 6,700,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |
Maturity obligation, 2017 |  |  |  | 26,700,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |
Maturity obligation, 2018 |  |  |  | 26,700,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |
Maturity obligation, 2019 |  |  |  | 131,700,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |
Maturity obligation, thereafter |  |  |  | 53,200,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |
Senior Notes Payable Through 2021, 5.41% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of loans in technical violation |  | 1 msa_DebtInstrumentCovenantComplianceNumberofLoanViolations / us-gaap_DebtInstrumentAxis = msa_SeniorNotesPayableThroughTwoThousandTwentyOneFivePointFourtyOnePercentageMember |  |  |
Number of cross default violation loans |  | 2 msa_DebtInstrumentCovenantComplianceNumberofLoanDefaults / us-gaap_DebtInstrumentAxis = msa_SeniorNotesPayableThroughTwoThousandTwentyOneFivePointFourtyOnePercentageMember |  |  |
Industrial Development Debt Issues Payable Through 2022, 0.30% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, debt amount expected to be redeemed |  |  | 4,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = msa_IndustrialDevelopmentDebtPayableThroughTwoThousandTwentyTwoToZeroPointThreeZeroPercentageMember |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 2,800,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Potential Face Amount |  |  |  | 175,000,000 msa_DebtInstrumentPotentialFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes | Senior Note due June 2, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Potential Face Amount |  |  |  |  | $ 100,000,000 msa_DebtInstrumentPotentialFaceAmount / us-gaap_CreditFacilityAxis = msa_SeniorNotedueJune22017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

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- Definition Debt Instrument, Covenant Compliance, Number of Loan Defaults + References No definition available. + Details
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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth 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 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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