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SIGNIFICANT ACCOUNTING POLICIES (Textual) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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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) | 260,090 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 45,850 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 107,814 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Research and Development |  |  |
Research and development costs | $ 43,256 us-gaap_ResearchAndDevelopmentExpense | $ 42,126 us-gaap_ResearchAndDevelopmentExpense | $ 37,305 us-gaap_ResearchAndDevelopmentExpense
Bonus |  |  |
Costs related to the Company's discretionary employee bonus programs | $ 128,478 leco_CostsRelatedToDiscretionaryEmployeeBonusPrograms | $ 123,571 leco_CostsRelatedToDiscretionaryEmployeeBonusPrograms | $ 124,947 leco_CostsRelatedToDiscretionaryEmployeeBonusPrograms

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- Definition 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. + References No definition available. + Details
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- Definition 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 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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