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SEGMENT INFORMATION (Geographic Split of Net Sales and Property, Plant and Equipment ) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 683,954 us-gaap_SalesRevenueGoodsNet | $ 715,777 us-gaap_SalesRevenueGoodsNet | $ 728,531 us-gaap_SalesRevenueGoodsNet | $ 685,062 us-gaap_SalesRevenueGoodsNet | $ 714,791 us-gaap_SalesRevenueGoodsNet | $ 691,875 us-gaap_SalesRevenueGoodsNet | $ 727,432 us-gaap_SalesRevenueGoodsNet | $ 718,573 us-gaap_SalesRevenueGoodsNet | $ 2,813,324 us-gaap_SalesRevenueGoodsNet | $ 2,852,671 us-gaap_SalesRevenueGoodsNet | $ 2,853,367 us-gaap_SalesRevenueGoodsNet
Total property, plant and equipment, net | 437,209 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 484,005 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 437,209 us-gaap_PropertyPlantAndEquipmentNet | 484,005 us-gaap_PropertyPlantAndEquipmentNet | 486,236 us-gaap_PropertyPlantAndEquipmentNet
United States |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,417,750 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 1,350,309 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 1,283,066 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US
Total property, plant and equipment, net | 171,746 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 162,357 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 171,746 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 162,357 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 170,831 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
China |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 190,035 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN | 219,490 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN | 229,996 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN
Total property, plant and equipment, net | 56,247 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN |  |  |  | 83,416 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN |  |  |  | 56,247 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | 83,416 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | 92,744 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN
Other foreign countries |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,205,539 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember | 1,282,872 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember | 1,340,305 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember
Total property, plant and equipment, net | 209,640 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember |  |  |  | 238,685 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember |  |  |  | 209,640 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember | 238,685 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember | 223,050 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = leco_OtherForeignCountriesMember
Corporate / Eliminations |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment, net | $ (424)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_IntersegmentEliminationMember |  |  |  | $ (453)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_IntersegmentEliminationMember |  |  |  | $ (424)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_IntersegmentEliminationMember | $ (453)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_IntersegmentEliminationMember | $ (389)us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_IntersegmentEliminationMember
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Geographic split of the Company's net sales, based on the location of the customer, and property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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