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FAIR VALUE (Textual) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Assets and liabilities measured at fair value on a recurring basis
Weighted average discount rate (percent)	15.90%leco_PercentageOfRiskAdjustedCostOfCapital
Period of estimated sales as basis for contingent consideration (in years)	3 years
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)	$ 8,244us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Percentage of Cost of Debt	3.50%leco_PercentageOfCostOfDebt
Other Assets, Current	158,432us-gaap_OtherAssetsCurrent	102,931us-gaap_OtherAssetsCurrent
Other Liabilities, Current	27,070us-gaap_OtherLiabilitiesCurrent	1,129us-gaap_OtherLiabilitiesCurrent
SSCO Manufacturing, Inc. (d/b/a Arc Products)
Assets and liabilities measured at fair value on a recurring basis
Period of estimated sales as basis for contingent consideration (in years)	5 years
Non-cash accretion of contingent consideration	1,537us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = leco_SscoManufacturingIncMember
Contingent consideration	6,912us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = leco_SscoManufacturingIncMember
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	37.80%leco_WeightedAverageCompoundAnnualEBITGrowthRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Assets and liabilities measured at fair value on a recurring basis
Contingent consideration	6,912us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	5,375us-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	25,268us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	16,974us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Assets Held-for-sale [Member]
Assets and liabilities measured at fair value on a recurring basis
Other Assets, Current	30,437us-gaap_OtherAssetsCurrent / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember
Other Liabilities, Current	$ 11,345us-gaap_OtherLiabilitiesCurrent / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_AssetsHeldForSaleMember

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents the period of the basis for determining the amount of the payment recorded.

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- Definition

The effective rate that a company pays on its current debt. This can be measured in either before- or after-tax returns; however, because interest expense is deductible, the after-tax cost is seen most often.

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The risk based cost of capital is a term used in the field of financial investment to refer to the cost of an entity's funds (both debt and equity).

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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