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SIGNIFICANT ACCOUNTING POLICIES (Translation of Foreign Currencies) (Details) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Feb. 12, 2015 VEB | Dec. 31, 2014 VEB | Mar. 31, 2014 VEB | Feb. 08, 2013 VEB | Dec. 31, 2012 VEB
Foreign Currency Transaction [Abstract] |  |  |  |  |  |  |  |  |  |
Foreign currency transaction losses |  |  | $ 22,351 us-gaap_ForeignCurrencyTransactionGainLossRealized | $ 7,759 us-gaap_ForeignCurrencyTransactionGainLossRealized | $ 4,608 us-gaap_ForeignCurrencyTransactionGainLossRealized |  |  |  |  |
Venezuela - Foreign Currency |  |  |  |  |  |  |  |  |  |
Official exchange rate set by Venezuelan government for nonessential goods after devaluation (in bolivars per U.S. dollar) |  |  |  |  |  |  |  |  |  | 4.3 leco_OfficialBolivarsToUsDollarsExchangeRateSetByVenezuelanGovernmentForNonessentialGoodsAfterDevaluation
Official bolivars exchange rate after 2013 devaluation (in bolivars per U.S. dollar) |  |  |  |  |  |  |  |  | 6.3 leco_Officialbolivarsexchangerateafter2013Devaluation |
Venezuela - Highly Inflationary Economy |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Loss, before Tax |  | 17,665 us-gaap_ForeignCurrencyTransactionLossBeforeTax |  | 8,081 us-gaap_ForeignCurrencyTransactionLossBeforeTax |  |  |  |  |  |
Higher cost of goods sold due to the liquidation of inventory valued at the historical exchange rate | 3,468 leco_EffectOfLiquidationOfInventoryValuedAtHistoricalExchangeRateAfterCurrencyDevaluation |  |  | 4,117 leco_EffectOfLiquidationOfInventoryValuedAtHistoricalExchangeRateAfterCurrencyDevaluation |  |  |  |  |  |
SIMADI Rate |  |  |  |  |  | 170.0 leco_SIMADIRate |  |  |  |
SICAD I Rate |  |  |  |  |  |  | 12.0 leco_SICADIRate | 10.7 leco_SICADIRate |  |
Net bolivar-denominated monetary assets position |  |  | (1,264)leco_AssetForeignCurrencyDenominatedValue | 38,633 leco_AssetForeignCurrencyDenominatedValue |  |  |  |  |  |
Cash and Cash Equivalents Located in Venezuela |  |  | $ 2,124 leco_CashandCashEquivalentsLocatedinVenezuela | $ 50,642 leco_CashandCashEquivalentsLocatedinVenezuela |  |  |  |  |  |

X
- Definition The foreign currency-denominated net asset value. + References No definition available. + Details
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- Definition Amount of cash and cash equivalents on hand at the Company's Venezuelan operations at the respective financial statement date's official exchange rates. + References No definition available. + Details
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- Definition The effect of liquidation of inventory valued at the historical exchange rate on the entity's pretax earnings, after a devaluation of foreign currency. + References No definition available. + Details
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- Definition Represents the official bolivars to US Dollars foreign currency exchange rate set by the Venezuelan government for nonessential goods after the devaluation on February 8, 2013. + References No definition available. + Details
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- Definition Represents the official bolivars to US Dollars foreign currency exchange rate set by the Venezuelan government for nonessential goods after devaluation. + References No definition available. + Details
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- Definition Represents the auction-based bolivars to US dollars foreign currency exchange rate applicable to the settlement of certain transaction through CENOEX, including payments of dividends and royalties. + References No definition available. + Details
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- Definition Represents the current Venezuelan bolivars to US dollars foreign currency exchange rate through the Marginal Currency System established in February, 2015. + References No definition available. + Details
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- Details
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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