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Assets Held for Sale and Discontinued Operations - Discontinued Operations Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets Held for Sale and Discontinued Operations [Abstract]
Trade receivables, less allowance for doubtful accounts	$ 6,638us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	$ 7,452us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
Inventories	11,829us-gaap_InventoriesPropertyHeldForSaleCurrent	11,359us-gaap_InventoriesPropertyHeldForSaleCurrent
Net property	342us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment	317us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment
Other assets	2,022us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets	1,326us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets
Total assets	20,831us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation	20,454us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Accounts payable	5,263us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable	5,447us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable
Accrued and other liabilities	991us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities	930us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities
Total liabilities	6,254us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	6,377us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Net assets	$ 14,577msa_DisposalGroupIncludingDiscontinuedOperationAssetsandLiabilitiesofDisposalGroupNet	$ 14,077msa_DisposalGroupIncludingDiscontinuedOperationAssetsandLiabilitiesofDisposalGroupNet

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.

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Amount classified as inventory attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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