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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     $ 22,351us-gaap_ForeignCurrencyTransactionGainLossRealized $ 7,759us-gaap_ForeignCurrencyTransactionGainLossRealized $ 4,608us-gaap_ForeignCurrencyTransactionGainLossRealized          
Venezuela - Foreign Currency                    
Official exchange rate set by Venezuelan government for nonessential goods after devaluation (in bolivars per U.S. dollar)                   4.3leco_OfficialBolivarsToUsDollarsExchangeRateSetByVenezuelanGovernmentForNonessentialGoodsAfterDevaluation
Official bolivars exchange rate after 2013 devaluation (in bolivars per U.S. dollar)                 6.3leco_Officialbolivarsexchangerateafter2013Devaluation  
Venezuela - Highly Inflationary Economy                    
Foreign Currency Transaction Loss, before Tax   17,665us-gaap_ForeignCurrencyTransactionLossBeforeTax   8,081us-gaap_ForeignCurrencyTransactionLossBeforeTax            
Higher cost of goods sold due to the liquidation of inventory valued at the historical exchange rate 3,468leco_EffectOfLiquidationOfInventoryValuedAtHistoricalExchangeRateAfterCurrencyDevaluation     4,117leco_EffectOfLiquidationOfInventoryValuedAtHistoricalExchangeRateAfterCurrencyDevaluation            
SIMADI Rate           170.0leco_SIMADIRate        
SICAD I Rate             12.0leco_SICADIRate 10.7leco_SICADIRate    
Net bolivar-denominated monetary assets position     (1,264)leco_AssetForeignCurrencyDenominatedValue 38,633leco_AssetForeignCurrencyDenominatedValue            
Cash and Cash Equivalents Located in Venezuela     $ 2,124leco_CashandCashEquivalentsLocatedinVenezuela $ 50,642leco_CashandCashEquivalentsLocatedinVenezuela