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Assets Held for Sale and Discontinued Operations - Discontinued Operations (Details) (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
Assets Held for Sale and Discontinued Operations [Abstract]
Net sales	$ 12,222us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 14,645us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 10,589us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 10,060us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 12,142us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 13,361us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 13,836us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 13,353us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 47,516us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 52,692us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 58,461us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Other income, net									660us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome	40us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome	115us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
Cost of products sold									38,259us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold	41,181us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold	45,277us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold
Selling, general and administrative									7,650us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense	7,389us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense	8,376us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense
Interest expense									0us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense	0us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense	17us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
Currency exchange losses, net									(116)msa_DisposalGroupIncludingDiscontinuedOperationsForeignCurrencyTransactionGainLossbeforeTax	(325)msa_DisposalGroupIncludingDiscontinuedOperationsForeignCurrencyTransactionGainLossbeforeTax	(41)msa_DisposalGroupIncludingDiscontinuedOperationsForeignCurrencyTransactionGainLossbeforeTax
Income from discontinued operations before income taxes									2,383us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	4,487us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	4,947us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Provision for income taxes									607us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	1,426us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	1,128us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Income from discontinued operations, net of tax									$ 1,776us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	$ 3,061us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	$ 3,819us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement, specifically related to discontinued operations

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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Amount of costs of goods sold attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of general and administrative expense attributable to disposal group.

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Amount of interest expense allocated to disposal group, including a discontinued operation.

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Amount of other income attributable to disposal group.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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