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Earnings per Share - Schedule of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings per share attributable to MSA Safety Incorporated common shareholders: |  |
Net income attributable to continuing operations | $ 9,316us-gaap_IncomeLossFromContinuingOperations | $ 13,522us-gaap_IncomeLossFromContinuingOperations
Preferred stock dividends | (10)msa_DividendsPreferredStockStockContinuingOperations | (10)msa_DividendsPreferredStockStockContinuingOperations
Income from continuing operations available to common equity | 9,306msa_NetIncomeLossAvailabletoCommonStockholdersBasicContinuingOperations | 13,512msa_NetIncomeLossAvailabletoCommonStockholdersBasicContinuingOperations
Dividends and undistributed earnings allocated to participating securities | (28)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations | (90)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations
Income from continuing operations available to common shareholders | 9,278msa_NetIncomeLossAvailabletoCommonStockholdersDilutedContinuingOperations | 13,422msa_NetIncomeLossAvailabletoCommonStockholdersDilutedContinuingOperations
Net income attributable to discontinued operations | 366us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 504us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Preferred stock dividends | 0msa_DividendsPreferredStockStockDiscontinuedOperations | 0msa_DividendsPreferredStockStockDiscontinuedOperations
Income from discontinued operations available to common equity | 366msa_NetIncomeLossAvailabletoCommonStockholdersBasicDiscontinuedOperations | 504msa_NetIncomeLossAvailabletoCommonStockholdersBasicDiscontinuedOperations
Dividends and undistributed earnings allocated to participating securities | (1)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesDiscontinuedOperations | (4)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesDiscontinuedOperations
Income from discontinued operations available to common shareholders | $ 365msa_NetIncomeLossAvailabletoCommonStockholdersDilutedDiscontinuedOperations | $ 500msa_NetIncomeLossAvailabletoCommonStockholdersDilutedDiscontinuedOperations
Basic weighted-average shares outstanding | 37,356us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 37,015us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options and other stock compensation | 493us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 602us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted-average shares outstanding | 37,849us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 37,617us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive stock options | 495us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Earnings per share attributable to continuing operations: |  |
Income from continuing operations, basic (dollars per share) | $ 0.25us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.37us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income from continuing operations, diluted (dollars per share) | $ 0.25us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.36us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Earnings per share attributable to discontinued operations: |  |
Income from discontinued operations, basic (dollars per share) | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Income from discontinued operations, diluted (dollars per share) | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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