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INCOME TAXES (Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Balance at the beginning of the year | $ 25,907 us-gaap_UnrecognizedTaxBenefits | $ 25,255 us-gaap_UnrecognizedTaxBenefits
Increase related to current year tax provisions | 700 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 1,990 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
(Decrease) increase related to prior years' tax positions | (848)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 208 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Increase related to acquisitions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition | 3,528 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
Decrease related to settlements with taxing authorities | (1,216)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (95)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Resolution of and other decreases in prior years' tax liabilities | (3,727)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (3,491)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Other | (2,427)leco_UnrecognizedTaxBenefitsOtherAdjustments | (1,488)leco_UnrecognizedTaxBenefitsOtherAdjustments
Balance at the end of the year | 18,389 us-gaap_UnrecognizedTaxBenefits | 25,907 us-gaap_UnrecognizedTaxBenefits
Interest and penalties expense (benefit) | (1,406)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 492 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accrued interest and penalties | 8,019 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 10,257 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | 9,132 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 13,739 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Reasonably possible further reduction in prior years' unrecognized tax benefits during the next twelve months | 3,901 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | (50,282)us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority |
Interest Received On Income Tax Examination Refund From Settlement With Taxing Authority | 1,236 leco_InterestReceivedOnIncomeTaxExaminationRefundFromSettlementWithTaxingAuthority |
Deposits Assets, Current | $ 27,068 us-gaap_DepositsAssetsCurrent |
Rate of interest to be earned on tax deposit upon favorable outcome (percent) | 1.00%leco_RateOfInterestEarnedOnTaxDeposit |

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- Definition Represents the rate of interest to be earned on tax deposits made on disputed tax assessments in the event of a favorable outcome. + References No definition available. + Details
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- Definition The amount of changes in unrecognized tax benefits resulting from other adjustments for the period. + References No definition available. + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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