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FAIR VALUE (Textual) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Assets and liabilities measured at fair value on a recurring basis    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) $ 680us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease  
Business Combination Arrangement Remaining Interest Period 3 years  
Cost of debt (as a percent) 3.50%leco_PercentageOfCostOfDebt  
Risk adjusted cost of capital (as a percent) 15.90%leco_PercentageOfRiskAdjustedCostOfCapital  
Other current assets 138,165us-gaap_OtherAssetsCurrent 167,596us-gaap_OtherAssetsCurrent
Other current liabilities 254,496us-gaap_OtherLiabilitiesCurrent 221,771us-gaap_OtherLiabilitiesCurrent
Fair value of long-term debt 10,801us-gaap_LongTermDebtFairValue 9,323us-gaap_LongTermDebtFairValue
Carrying value of long-term debt 10,921leco_DebtAndCapitalLeaseObligationsExcludingShortTermBorrowings 9,499leco_DebtAndCapitalLeaseObligationsExcludingShortTermBorrowings
Assets Held-for-sale [Member]    
Assets and liabilities measured at fair value on a recurring basis    
Other current assets 29,307us-gaap_OtherAssetsCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_AssetsHeldForSaleMember
 
Other current liabilities 8,482us-gaap_OtherLiabilitiesCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_AssetsHeldForSaleMember
 
SSCO Manufacturing, Inc. (d/b/a Arc Products)    
Assets and liabilities measured at fair value on a recurring basis    
Fair value of contingent consideration liability 7,606us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= leco_SscoManufacturingIncMember
 
Increase in liability 694us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= leco_SscoManufacturingIncMember
 
Period of estimated sales as basis for contingent consideration 5 years  
Minimum [Member]    
Assets and liabilities measured at fair value on a recurring basis    
Weighted Average Compound Annual EBIT Growth Rate 16.50%leco_WeightedAverageCompoundAnnualEBITGrowthRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum    
Assets and liabilities measured at fair value on a recurring basis    
Weighted Average Compound Annual EBIT Growth Rate 19.80%leco_WeightedAverageCompoundAnnualEBITGrowthRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]    
Assets and liabilities measured at fair value on a recurring basis    
Fair value of contingent consideration liability 7,606us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
6,912us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 23,801us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 25,268us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember