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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Defined Contribution Plans) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2006
Defined Contribution Plan |  |  |  |
Minimum percentage of eligible compensation that may be invested by all U.S. employees covered under the plan (as a percent) | 1.00%leco_DefinedContributionPlanEmployeeContributionPercentageMinimum |  |  |
Employer match of employee contributions of first 6% of eligible compensation (as a percent) | 35.00%leco_DefinedContributionPlanEmployerMatchLevelOne |  |  |
Percentage of eligible compensation, matched 35% by employer (as a percent) | 6.00%leco_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne |  |  |
Percentage of base pay as additional annual Company contribution to participants hired after November 1, 1997 (as a percent) | 2.00%leco_DefinedContributionPlanEmployersAdditionalAnnualMatch |  |  |
Annual costs recognized for defined contribution plans | $ 11,088 us-gaap_DefinedContributionPlanCostRecognized | $ 10,812 us-gaap_DefinedContributionPlanCostRecognized | $ 9,405 us-gaap_DefinedContributionPlanCostRecognized |
Minimum |  |  |  |
Defined Contribution Plan |  |  |  |
Percentage of base pay as additional annual Company contribution to participants hired after November 1, 1997 (as a percent) |  |  |  | 4.00%leco_DefinedContributionPlanEmployersAdditionalAnnualMatch / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |  |  |
Defined Contribution Plan |  |  |  |
Percentage of base pay as additional annual Company contribution to participants hired after November 1, 1997 (as a percent) |  |  |  | 10.00%leco_DefinedContributionPlanEmployersAdditionalAnnualMatch / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Minimum percentage of eligible compensation that may be invested by all U.S. employees who are covered under the 401(k) savings plan. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployeeContributionPercentageMinimum
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the employer additional matching contributions to a defined contribution plan for participants employer after certain date. + References No definition available. + Details
Name: | leco_DefinedContributionPlanEmployersAdditionalAnnualMatch
Namespace Prefix: | leco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |