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DERIVATIVES (Textual) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |
Maximum period for which derivative contracts cover currency and commodity exposures (in years) | 2 years |
Hedge ineffectiveness was immaterial | Hedge ineffectiveness was immaterial for the three years ended December 31, 2014. |
Expected gain to be reclassified from AOCI, net of tax, to earnings | $ 9 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer | 12 months |
Net Investment Hedging [Member] | Designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount of derivative instruments | 60,734 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_HedgingDesignationAxis = us-gaap_NetInvestmentHedgingMember |
Designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount of derivative instruments | 27,265 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 36,880 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount of derivative instruments | $ 280,949 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 186,158 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not designated as hedging instruments | Silver forward contract |  |
Derivative [Line Items] |  |
Notional amounts of forward contracts that are not designated as hedges | 275,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = leco_SilverCommodityForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 290,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = leco_SilverCommodityForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not designated as hedging instruments | Copper forward contract |  |
Derivative [Line Items] |  |
Notional amounts of forward contracts that are not designated as hedges | 375,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = leco_CopperCommodityForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 375,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = leco_CopperCommodityForwardContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Maximum period covered by derivative contracts to hedge currency and commodity exposures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition A disclosure of an assertion that the amount of cash flow hedge ineffectiveness is immaterial. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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