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DERIVATIVES (Textual) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Derivative [Line Items]    
Maximum period for which derivative contracts cover currency and commodity exposures 2 years  
Gain (loss) expected to be reclassified from AOCI to earnings, next twelve months $ 291us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths  
Gain (loss) expected to be reclassified from AOCI to earnings, period of recognition 12 months  
Hedge ineffectiveness was immaterial Hedge ineffectiveness was immaterial in the three months ended March 31, 2015 and 2014.  
Foreign exchange contracts | Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative, notional amount 24,785invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
27,265invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Foreign exchange contracts | Not designated as hedging instruments    
Derivative [Line Items]    
Derivative, notional amount 287,685invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
280,949invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]    
Derivative [Line Items]    
Derivative, notional amount 7,427invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NetInvestmentHedgingMember
60,734invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NetInvestmentHedgingMember
Silver forward contract | Not designated as hedging instruments    
Derivative [Line Items]    
Derivative, notional amount 3,934invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= leco_SilverCommodityForwardContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
4,467invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= leco_SilverCommodityForwardContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Copper forward contract | Not designated as hedging instruments    
Derivative [Line Items]    
Derivative, notional amount $ 992invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= leco_CopperCommodityForwardContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 1,066invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= leco_CopperCommodityForwardContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember