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SIGNIFICANT ACCOUNTING POLICIES (Textual) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Maximum period for which derivative contracts cover currency and commodity exposures (in years)	2 years
Product Warranties
Period of warranty services (in years)	3 years
Stock-Based Compensation
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)	260,090us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	45,850us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	107,814us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Research and Development
Research and development costs	$ 43,256us-gaap_ResearchAndDevelopmentExpense	$ 42,126us-gaap_ResearchAndDevelopmentExpense	$ 37,305us-gaap_ResearchAndDevelopmentExpense
Bonus
Costs related to the Company's discretionary employee bonus programs	$ 128,478leco_CostsRelatedToDiscretionaryEmployeeBonusPrograms	$ 123,571leco_CostsRelatedToDiscretionaryEmployeeBonusPrograms	$ 124,947leco_CostsRelatedToDiscretionaryEmployeeBonusPrograms

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Represents the costs related to the entity's discretionary employee bonus programs.

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Maximum period covered by derivative contracts to hedge currency and commodity exposures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from the date of sale for which warranty services are provided by the entity.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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