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Other (Loss) Income, Net - Schedule of Other Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Long Lived Assets Held-for-sale [Line Items] |  |  |
Interest income | $ 1,822 us-gaap_InterestIncomeOperating | $ 1,142 us-gaap_InterestIncomeOperating | $ 1,411 us-gaap_InterestIncomeOperating
Gain on asset dispositions, net | 2,094 us-gaap_GainLossOnDispositionOfAssets1 | 436 us-gaap_GainLossOnDispositionOfAssets1 | 8,396 us-gaap_GainLossOnDispositionOfAssets1
Land impairment loss | (50)us-gaap_ImpairmentOfRealEstate | (1,557)us-gaap_ImpairmentOfRealEstate | 0 us-gaap_ImpairmentOfRealEstate
Escrow settlement | 0 msa_GainFromEscrowSettlement | 0 msa_GainFromEscrowSettlement | 4,790 msa_GainFromEscrowSettlement
Intangible asset impairment loss | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | (4,272)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Other, net | (1,101)us-gaap_OtherOperatingIncomeExpenseNet | (196)us-gaap_OtherOperatingIncomeExpenseNet | 551 us-gaap_OtherOperatingIncomeExpenseNet
Total | 2,765 us-gaap_OtherIncome | (175)us-gaap_OtherIncome | 10,876 us-gaap_OtherIncome
Detector Tube Assets |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Gain on asset dispositions, net | $ 2,200 us-gaap_GainLossOnDispositionOfAssets1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = msa_DetectorTubeAssetsMember |  |

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- Definition Gain From Escrow Settlement + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + 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 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + 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(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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- Details
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