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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Textual) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 hours | Dec. 31, 2013 | Dec. 31, 2012
After-tax amounts included in Accumulated other comprehensive loss |  |  |
Unrecognized actuarial net loss | $ 199,786 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax |  |
Unrecognized prior service credits | (1,931)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax |  |
Unrecognized transition obligations | 38 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsAfterTax |  |
Pre-tax amounts expected to be recognized as components of net periodic benefit cost during next fiscal year |  |  |
Unrecognized actuarial net loss | 22,657 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss |  |
Unrecognized prior service credits | (625)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit |  |
Unrecognized transition obligations | 3 us-gaap_DefinedBenefitPlanAmortizationOfNetTransitionAssetObligation |  |
Total accumulated benefit obligation for all plans | 1,003,296 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation | 891,397 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |
Contributions to Plans |  |  |
Expected contribution to the plans during the next fiscal year | 21,000 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear |  |
Supplemental Executive Retirement Plan |  |  |
Total net pension costs | 12,395 us-gaap_PensionExpense | 29,908 us-gaap_PensionExpense | 36,258 us-gaap_PensionExpense
Projected benefit obligation | 1,045,471 us-gaap_DefinedBenefitPlanBenefitObligation | 941,442 us-gaap_DefinedBenefitPlanBenefitObligation | 1,033,725 us-gaap_DefinedBenefitPlanBenefitObligation
Multi-Employer Plans |  |  |
Annual pension costs of multi-employer plans for operations in Europe | 1,068 us-gaap_MultiemployerPlanPeriodContributions | 1,048 us-gaap_MultiemployerPlanPeriodContributions | 942 us-gaap_MultiemployerPlanPeriodContributions
Other Benefits |  |  |
Minimum percentage of every standard work week for which, the Company will provide work to employees in Cleveland, Ohio, area operations, covered under the guaranteed continuous employment plan (as a percent) | 75.00%leco_GuaranteedContinuousEmploymentPlanMinimumPercentageOfEveryStandardWorkWeekForWhichCompanyWillProvideWorkToEmployees |  |
Hours in a standard work week under Guaranteed Continuous Employment Plan (hours) | 40 leco_GuaranteedContinuousEmploymentPlanStandardHoursInWorkWeek |  |
Minimum notice period for the termination of Guaranteed Continuous Employment Plan (in months) | 6 months |  |
Supplemental executive retirement plan (SERP) |  |  |
Supplemental Executive Retirement Plan |  |  |
Total net pension costs | 3,012 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 2,329 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 2,254 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Projected benefit obligation | $ 17,953 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | $ 22,877 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | $ 25,646 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Equity Securities |  |  |
Target allocation for pension plan assets |  |  |
Target plan asset allocations range minimum | 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Target plan asset allocations range maximum | 55.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Debt Securities |  |  |
Target allocation for pension plan assets |  |  |
Target plan asset allocations range minimum | 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |
Target plan asset allocations range maximum | 55.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |

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- Definition Represents the minimum notice period prior to the end of calendar year for termination of Guaranteed Continuous Employment Plan by the entity at the end of the year. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References No definition available. + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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