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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 | 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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to continuing operations | $ 33,119 us-gaap_IncomeLossFromContinuingOperations |  | $ 18,674 us-gaap_IncomeLossFromContinuingOperations |  | $ 22,132 us-gaap_IncomeLossFromContinuingOperations |  | $ 13,522 us-gaap_IncomeLossFromContinuingOperations |  | $ 24,929 us-gaap_IncomeLossFromContinuingOperations |  | $ 18,987 us-gaap_IncomeLossFromContinuingOperations |  | $ 23,315 us-gaap_IncomeLossFromContinuingOperations |  | $ 18,627 us-gaap_IncomeLossFromContinuingOperations |  | $ 87,447 us-gaap_IncomeLossFromContinuingOperations |  | $ 85,858 us-gaap_IncomeLossFromContinuingOperations |  | $ 87,557 us-gaap_IncomeLossFromContinuingOperations
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (41)msa_DividendsPreferredStockStockContinuingOperations |  | (41)msa_DividendsPreferredStockStockContinuingOperations |  | (41)msa_DividendsPreferredStockStockContinuingOperations
Income from continuing operations available to common equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,406 msa_NetIncomeLossAvailabletoCommonStockholdersBasicContinuingOperations |  | 85,817 msa_NetIncomeLossAvailabletoCommonStockholdersBasicContinuingOperations |  | 87,516 msa_NetIncomeLossAvailabletoCommonStockholdersBasicContinuingOperations
Dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (546)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations |  | (643)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations |  | (836)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,860 msa_NetIncomeLossAvailabletoCommonStockholdersDilutedContinuingOperations |  | 85,174 msa_NetIncomeLossAvailabletoCommonStockholdersDilutedContinuingOperations |  | 86,680 msa_NetIncomeLossAvailabletoCommonStockholdersDilutedContinuingOperations
Net income attributable to discontinued operations | (432)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 631 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 356 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 504 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 482 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 514 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 734 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 659 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 1,059 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 2,389 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 3,080 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1)msa_DividendsPreferredStockStockDiscontinuedOperations |  | (1)msa_DividendsPreferredStockStockDiscontinuedOperations |  | (1)msa_DividendsPreferredStockStockDiscontinuedOperations
Income from discontinued operations available to common equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,058 msa_NetIncomeLossAvailabletoCommonStockholdersBasicDiscontinuedOperations |  | 2,388 msa_NetIncomeLossAvailabletoCommonStockholdersBasicDiscontinuedOperations |  | 3,079 msa_NetIncomeLossAvailabletoCommonStockholdersBasicDiscontinuedOperations
Dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesDiscontinuedOperations |  | (18)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesDiscontinuedOperations |  | (29)msa_UndistributedEarningsAllocatedtoParticipatingSecuritiesDiscontinuedOperations
Income from discontinued operations available to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,051 msa_NetIncomeLossAvailabletoCommonStockholdersDilutedDiscontinuedOperations |  | $ 2,370 msa_NetIncomeLossAvailabletoCommonStockholdersDilutedDiscontinuedOperations |  | $ 3,050 msa_NetIncomeLossAvailabletoCommonStockholdersDilutedDiscontinuedOperations
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,138 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 36,868 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 36,564 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options and other stock compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 590 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 582 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 478 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted-average shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,728 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 37,450 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 37,042 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 15 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 744 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Earnings per share attributable to continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, Basic (dollars per share) | $ 0.88 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.50 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.59 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.67 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.63 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 0.50 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 2.34 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 2.31 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | [1] | $ 2.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income from continuing operations, Diluted (dollars per share) | $ 0.87 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.49 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.58 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.36 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.66 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.62 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 0.49 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 2.30 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 2.28 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | [1] | $ 2.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Earnings per share attributable to discontinued operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, Basic (dollars per share) | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | [1] | $ 0.08 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Income from discontinued operations, Diluted (dollars per share) | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.06 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | [1] | $ 0.08 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
[1] | Per share amounts are calculated independently for each period presented; therefore, the sum of the quarterly per share amounts may not equal the per share amounts for the year.

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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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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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