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SEGMENT INFORMATION (Textual) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Financial information for the reportable segments |  |  |  |  |  |  |  |
Restructuring charges |  | $ 1,241 us-gaap_RestructuringCharges | $ 3,658 us-gaap_RestructuringCharges |  |  |  |  |
Number of operating segments (segments) |  | 5 us-gaap_NumberOfOperatingSegments |  |  |  |  |  |
Percentage of total inventories valued using the LIFO method (as a percent) |  | 40.00%us-gaap_PercentageOfLIFOInventory | 38.00%us-gaap_PercentageOfLIFOInventory | 34.00%us-gaap_PercentageOfLIFOInventory | 38.00%us-gaap_PercentageOfLIFOInventory |  |  |
Special items |  |  |  |  |  |  |  |
Asset Impairment Charges |  | 32,742 us-gaap_AssetImpairmentCharges |  |  |  |  |  |
Special items charge (Gain) |  | 51,186 leco_SpecialItemsChargeGain | 21,366 leco_SpecialItemsChargeGain | 10,735 leco_SpecialItemsChargeGain |  |  |  |
Foreign Currency Transaction Loss, before Tax | 17,665 us-gaap_ForeignCurrencyTransactionLossBeforeTax |  | 8,081 us-gaap_ForeignCurrencyTransactionLossBeforeTax |  |  |  |  |
Europe Welding |  |  |  |  |  |  |  |
Financial information for the reportable segments |  |  |  |  |  |  |  |
Restructuring charges |  | 911 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_EuropeWeldingMember | 1,765 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_EuropeWeldingMember | 3,637 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_EuropeWeldingMember |  |  |  |
Special items |  |  |  |  |  |  |  |
Special items charge (Gain) |  | 904 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_EuropeWeldingMember | 2,045 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_EuropeWeldingMember | 3,534 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_EuropeWeldingMember |  |  |  |
Asia Pacific Welding |  |  |  |  |  |  |  |
Financial information for the reportable segments |  |  |  |  |  |  |  |
Restructuring charges |  | (184)us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember | 841 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember | 3,151 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |  |  |
Special items |  |  |  |  |  |  |  |
Other Asset Impairment Charges |  | 32,742 us-gaap_OtherAssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember | 4,444 us-gaap_OtherAssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |  | 4,675 us-gaap_OtherAssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |
Asset Impairment Charges |  |  |  | 1,842 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |  |  |
Land Sales |  | (3,923)us-gaap_LandSales / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember | 705 us-gaap_LandSales / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  | 705 us-gaap_LandSales / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |  |
Special items charge (Gain) |  | 28,635 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember | 6,071 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember | 4,993 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |  |  |
Restructuring Charges Net |  |  | 922 leco_RestructuringChargesNet / us-gaap_StatementBusinessSegmentsAxis = leco_AsiaPacificWeldingMember |  |  |  |  |
South America Welding |  |  |  |  |  |  |  |
Financial information for the reportable segments |  |  |  |  |  |  |  |
Restructuring charges |  | 582 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember |  |  |  |  |
Special items |  |  |  |  |  |  |  |
Special items charge (Gain) |  | 21,715 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember | 12,198 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember | 1,381 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember |  |  | 2,538 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember | 9,660 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember
Foreign Currency Transaction Loss, before Tax |  | 21,133 us-gaap_ForeignCurrencyTransactionLossBeforeTax / us-gaap_StatementBusinessSegmentsAxis = leco_SouthAmericaWeldingMember |  |  |  |  |  |
The Harris Products Group |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |
Special items charge (Gain) |  | 0 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_HarrisProductsGroupMember | 0 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_HarrisProductsGroupMember | 0 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_HarrisProductsGroupMember |  |  |  |
North America Welding |  |  |  |  |  |  |  |
Financial information for the reportable segments |  |  |  |  |  |  |  |
Restructuring charges |  | (68)us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_NorthAmericaWeldingMember | 1,052 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_NorthAmericaWeldingMember | 827 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = leco_NorthAmericaWeldingMember |  |  |  |
Special items |  |  |  |  |  |  |  |
Special items charge (Gain) |  | (68)leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_NorthAmericaWeldingMember | 1,052 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_NorthAmericaWeldingMember | 827 leco_SpecialItemsChargeGain / us-gaap_StatementBusinessSegmentsAxis = leco_NorthAmericaWeldingMember |  |  |  |
United States |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |
EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries1 |  | $ 210,325 leco_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries1 / us-gaap_StatementGeographicalAxis = country_US | $ 260,195 leco_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries1 / us-gaap_StatementGeographicalAxis = country_US | $ 268,331 leco_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries1 / us-gaap_StatementGeographicalAxis = country_US |  |  |  |
Revenues | Customer concentration risk | Maximum |  |  |  |  |  |  |  |
Special items |  |  |  |  |  |  |  |
Percentage of concentration of credit risk not met other than separately disclosed |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |

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- Definition Amount of expenses, net of asset impairments and gains or losses on sale of assets, associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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